Restoring authorship annotation for <leonidvasilev@yandex-team.ru>. Commit 1 of 2.

27 files changed, 1051 insertions, 1051 deletions

diff --git a/library/cpp/actors/core/process_stats.cpp b/library/cpp/actors/core/process_stats.cpp
index 0e1dbd0031..4eb7d7c2fc 100644
--- a/library/cpp/actors/core/process_stats.cpp
+++ b/library/cpp/actors/core/process_stats.cpp
@@ -6,7 +6,7 @@
 #include <library/cpp/monlib/dynamic_counters/counters.h>
 #include <library/cpp/monlib/metrics/metric_registry.h>
 
-#include <util/datetime/uptime.h>
+#include <util/datetime/uptime.h> 
 #include <util/system/defaults.h>
 #include <util/stream/file.h>
 #include <util/string/vector.h>
@@ -74,8 +74,8 @@ namespace NActors {
                 Stime /= tickPerMillisec;
                 CUtime /= tickPerMillisec;
                 CStime /= tickPerMillisec;
-                SystemUptime = ::Uptime();
-                Uptime = SystemUptime - TDuration::MilliSeconds(StartTime / TicksPerMillisec());
+                SystemUptime = ::Uptime(); 
+                Uptime = SystemUptime - TDuration::MilliSeconds(StartTime / TicksPerMillisec()); 
             }
 
             TFileInput statm("/proc/" + strPid + "/statm");
@@ -196,9 +196,9 @@ namespace {
             SysTime = ProcStatGroup->GetCounter("Process/SystemTime", true);
             MinorPageFaults = ProcStatGroup->GetCounter("Process/MinorPageFaults", true);
             MajorPageFaults = ProcStatGroup->GetCounter("Process/MajorPageFaults", true);
-            UptimeSeconds = ProcStatGroup->GetCounter("Process/UptimeSeconds", false);
+            UptimeSeconds = ProcStatGroup->GetCounter("Process/UptimeSeconds", false); 
             NumThreads = ProcStatGroup->GetCounter("Process/NumThreads", false);
-            SystemUptimeSeconds = ProcStatGroup->GetCounter("System/UptimeSeconds", false);
+            SystemUptimeSeconds = ProcStatGroup->GetCounter("System/UptimeSeconds", false); 
         }
 
         void UpdateCounters(const TProcStat& procStat) {
@@ -212,9 +212,9 @@ namespace {
             *SysTime = procStat.Stime;
             *MinorPageFaults = procStat.MinFlt;
             *MajorPageFaults = procStat.MajFlt;
-            *UptimeSeconds = procStat.Uptime.Seconds();
+            *UptimeSeconds = procStat.Uptime.Seconds(); 
             *NumThreads = procStat.NumThreads;
-            *SystemUptimeSeconds = procStat.Uptime.Seconds();
+            *SystemUptimeSeconds = procStat.Uptime.Seconds(); 
         }
 
     private:
@@ -227,9 +227,9 @@ namespace {
         NMonitoring::TDynamicCounters::TCounterPtr SysTime;
         NMonitoring::TDynamicCounters::TCounterPtr MinorPageFaults;
         NMonitoring::TDynamicCounters::TCounterPtr MajorPageFaults;
-        NMonitoring::TDynamicCounters::TCounterPtr UptimeSeconds;
+        NMonitoring::TDynamicCounters::TCounterPtr UptimeSeconds; 
         NMonitoring::TDynamicCounters::TCounterPtr NumThreads;
-        NMonitoring::TDynamicCounters::TCounterPtr SystemUptimeSeconds;
+        NMonitoring::TDynamicCounters::TCounterPtr SystemUptimeSeconds; 
     };
 
 
@@ -243,9 +243,9 @@ namespace {
             AnonRssSize = registry.IntGauge({{"sensor", "process.AnonRssSize"}});
             FileRssSize = registry.IntGauge({{"sensor", "process.FileRssSize"}});
             CGroupMemLimit = registry.IntGauge({{"sensor", "process.CGroupMemLimit"}});
-            UptimeSeconds = registry.IntGauge({{"sensor", "process.UptimeSeconds"}});
+            UptimeSeconds = registry.IntGauge({{"sensor", "process.UptimeSeconds"}}); 
             NumThreads = registry.IntGauge({{"sensor", "process.NumThreads"}});
-            SystemUptimeSeconds = registry.IntGauge({{"sensor", "system.UptimeSeconds"}});
+            SystemUptimeSeconds = registry.IntGauge({{"sensor", "system.UptimeSeconds"}}); 
 
             UserTime = registry.Rate({{"sensor", "process.UserTime"}});
             SysTime = registry.Rate({{"sensor", "process.SystemTime"}});
@@ -258,9 +258,9 @@ namespace {
             AnonRssSize->Set(procStat.AnonRss);
             FileRssSize->Set(procStat.FileRss);
             CGroupMemLimit->Set(procStat.CGroupMemLim);
-            UptimeSeconds->Set(procStat.Uptime.Seconds());
+            UptimeSeconds->Set(procStat.Uptime.Seconds()); 
             NumThreads->Set(procStat.NumThreads);
-            SystemUptimeSeconds->Set(procStat.SystemUptime.Seconds());
+            SystemUptimeSeconds->Set(procStat.SystemUptime.Seconds()); 
 
             // it is ok here to reset and add metric value, because mutation
             // is performed in siglethreaded context
@@ -287,9 +287,9 @@ namespace {
         NMonitoring::TRate* SysTime;
         NMonitoring::TRate* MinorPageFaults;
         NMonitoring::TRate* MajorPageFaults;
-        NMonitoring::TIntGauge* UptimeSeconds;
+        NMonitoring::TIntGauge* UptimeSeconds; 
         NMonitoring::TIntGauge* NumThreads;
-        NMonitoring::TIntGauge* SystemUptimeSeconds;
+        NMonitoring::TIntGauge* SystemUptimeSeconds; 
     };
 } // namespace
 
diff --git a/library/cpp/actors/http/http.cpp b/library/cpp/actors/http/http.cpp
index 7125f9d8b0..ae0860e1e3 100644
--- a/library/cpp/actors/http/http.cpp
+++ b/library/cpp/actors/http/http.cpp
@@ -45,7 +45,7 @@ template <> TStringBuf THttpResponse::GetName<&THttpResponse::ContentType>() { r
 template <> TStringBuf THttpResponse::GetName<&THttpResponse::ContentLength>() { return "Content-Length"; }
 template <> TStringBuf THttpResponse::GetName<&THttpResponse::TransferEncoding>() { return "Transfer-Encoding"; }
 template <> TStringBuf THttpResponse::GetName<&THttpResponse::LastModified>() { return "Last-Modified"; }
-template <> TStringBuf THttpResponse::GetName<&THttpResponse::ContentEncoding>() { return "Content-Encoding"; }
+template <> TStringBuf THttpResponse::GetName<&THttpResponse::ContentEncoding>() { return "Content-Encoding"; } 
 
 const TMap<TStringBuf, TStringBuf THttpResponse::*, TLessNoCase> THttpResponse::HeadersLocation = {
     { THttpResponse::GetName<&THttpResponse::Connection>(), &THttpResponse::Connection },
@@ -53,7 +53,7 @@ const TMap<TStringBuf, TStringBuf THttpResponse::*, TLessNoCase> THttpResponse::
     { THttpResponse::GetName<&THttpResponse::ContentLength>(), &THttpResponse::ContentLength },
     { THttpResponse::GetName<&THttpResponse::TransferEncoding>(), &THttpResponse::TransferEncoding },
     { THttpResponse::GetName<&THttpResponse::LastModified>(), &THttpResponse::LastModified },
-    { THttpResponse::GetName<&THttpResponse::ContentEncoding>(), &THttpResponse::ContentEncoding }
+    { THttpResponse::GetName<&THttpResponse::ContentEncoding>(), &THttpResponse::ContentEncoding } 
 };
 
 void THttpRequest::Clear() {
diff --git a/library/cpp/actors/http/http.h b/library/cpp/actors/http/http.h
index 96c5c1ec48..6e212500d7 100644
--- a/library/cpp/actors/http/http.h
+++ b/library/cpp/actors/http/http.h
@@ -141,7 +141,7 @@ public:
     TStringBuf ContentLength;
     TStringBuf TransferEncoding;
     TStringBuf LastModified;
-    TStringBuf ContentEncoding;
+    TStringBuf ContentEncoding; 
 
     TStringBuf Body;
 
diff --git a/library/cpp/actors/http/http_ut.cpp b/library/cpp/actors/http/http_ut.cpp
index 4c922f8d0f..870199ce0f 100644
--- a/library/cpp/actors/http/http_ut.cpp
+++ b/library/cpp/actors/http/http_ut.cpp
@@ -83,17 +83,17 @@ Y_UNIT_TEST_SUITE(HttpProxy) {
         UNIT_ASSERT_EQUAL(response->Body, "this\r\n is test.");
     }
 
-    Y_UNIT_TEST(CreateRepsonseWithCompressedBody) {
-        NHttp::THttpIncomingRequestPtr request = nullptr;
-        NHttp::THttpOutgoingResponsePtr response = new NHttp::THttpOutgoingResponse(request, "HTTP", "1.1", "200", "OK");
-        response->Set<&NHttp::THttpResponse::ContentEncoding>("gzip");
-        TString compressedBody = "compressed body";
-        response->SetBody(compressedBody);
-        UNIT_ASSERT_VALUES_EQUAL("gzip", response->ContentEncoding);
-        UNIT_ASSERT_VALUES_EQUAL(ToString(compressedBody.size()), response->ContentLength);
-        UNIT_ASSERT_VALUES_EQUAL(compressedBody, response->Body);
-    }
-
+    Y_UNIT_TEST(CreateRepsonseWithCompressedBody) { 
+        NHttp::THttpIncomingRequestPtr request = nullptr; 
+        NHttp::THttpOutgoingResponsePtr response = new NHttp::THttpOutgoingResponse(request, "HTTP", "1.1", "200", "OK"); 
+        response->Set<&NHttp::THttpResponse::ContentEncoding>("gzip"); 
+        TString compressedBody = "compressed body"; 
+        response->SetBody(compressedBody); 
+        UNIT_ASSERT_VALUES_EQUAL("gzip", response->ContentEncoding); 
+        UNIT_ASSERT_VALUES_EQUAL(ToString(compressedBody.size()), response->ContentLength); 
+        UNIT_ASSERT_VALUES_EQUAL(compressedBody, response->Body); 
+    } 
+ 
     Y_UNIT_TEST(BasicPartialParsing) {
         NHttp::THttpIncomingRequestPtr request = new NHttp::THttpIncomingRequest();
         EatPartialString(request, "GET /test HTTP/1.1\r\nHost: test\r\nSome-Header: 32344\r\n\r\n");
diff --git a/ydb/core/grpc_services/rpc_calls.h b/ydb/core/grpc_services/rpc_calls.h
index 43136c2f4a..e288b64a0f 100644
--- a/ydb/core/grpc_services/rpc_calls.h
+++ b/ydb/core/grpc_services/rpc_calls.h
@@ -85,7 +85,7 @@ using TEvKikhouseDescribeTableRequest = TGRpcRequestWrapper<TRpcServices::EvKikh
 using TEvS3ListingRequest = TGRpcRequestWrapper<TRpcServices::EvS3Listing, Ydb::S3Internal::S3ListingRequest, Ydb::S3Internal::S3ListingResponse, true>;
 using TEvBiStreamPingRequest = TGRpcRequestBiStreamWrapper<TRpcServices::EvBiStreamPing, Draft::Dummy::PingRequest, Draft::Dummy::PingResponse>;
 using TEvExperimentalStreamQueryRequest = TGRpcRequestWrapper<TRpcServices::EvExperimentalStreamQuery, Ydb::Experimental::ExecuteStreamQueryRequest, Ydb::Experimental::ExecuteStreamQueryResponse, false>;
-using TEvStreamPQWriteRequest = TGRpcRequestBiStreamWrapper<TRpcServices::EvStreamPQWrite, Ydb::PersQueue::V1::StreamingWriteClientMessage, Ydb::PersQueue::V1::StreamingWriteServerMessage>;
+using TEvStreamPQWriteRequest = TGRpcRequestBiStreamWrapper<TRpcServices::EvStreamPQWrite, Ydb::PersQueue::V1::StreamingWriteClientMessage, Ydb::PersQueue::V1::StreamingWriteServerMessage>; 
 using TEvStreamPQReadRequest = TGRpcRequestBiStreamWrapper<TRpcServices::EvStreamPQRead, Ydb::PersQueue::V1::MigrationStreamingReadClientMessage, Ydb::PersQueue::V1::MigrationStreamingReadServerMessage>;
 using TEvPQReadInfoRequest = TGRpcRequestWrapper<TRpcServices::EvPQReadInfo, Ydb::PersQueue::V1::ReadInfoRequest, Ydb::PersQueue::V1::ReadInfoResponse, true>;
 using TEvPQDropTopicRequest = TGRpcRequestValidationWrapper<TRpcServices::EvPQDropTopic, Ydb::PersQueue::V1::DropTopicRequest, Ydb::PersQueue::V1::DropTopicResponse, true>;
diff --git a/ydb/core/protos/grpc_pq_old.proto b/ydb/core/protos/grpc_pq_old.proto
index ed273e1404..4399c0f15b 100755
--- a/ydb/core/protos/grpc_pq_old.proto
+++ b/ydb/core/protos/grpc_pq_old.proto
@@ -32,7 +32,7 @@ message TDataChunk {
 
     optional EChunkType ChunkType = 9 [default = REGULAR];
 
-    optional int64 Codec = 10;
+    optional int64 Codec = 10; 
 
     optional TMapType ExtraFields     = 126;
 
diff --git a/ydb/core/protos/pqconfig.proto b/ydb/core/protos/pqconfig.proto
index 7c85927449..350f54abf0 100644
--- a/ydb/core/protos/pqconfig.proto
+++ b/ydb/core/protos/pqconfig.proto
@@ -35,7 +35,7 @@ message TPQConfig {
 
     optional bool CheckACL = 9 [default = false];
 
-    optional uint32 SourceIdCleanupPeriodSec = 10 [default = 60]; // 24 hours // TODO: What is '24 hours'? Default is 60 seconds.
+    optional uint32 SourceIdCleanupPeriodSec = 10 [default = 60]; // 24 hours // TODO: What is '24 hours'? Default is 60 seconds. 
     optional uint32 SourceIdMaxLifetimeSec = 11 [default = 1382400]; // 16 days
     optional uint32 SourceIdTotalShardsCount = 12 [default = 131072];
 
@@ -77,9 +77,9 @@ message TPQConfig {
     }
     optional TQuotingConfig QuotingConfig = 18;
 
-    // Time duration that we wait before we consider remote cluster enabled for load balancing purposes
-    optional uint32 RemoteClusterEnabledDelaySec = 24 [default = 300]; // 5 minutes
-    optional uint32 CloseClientSessionWithEnabledRemotePreferredClusterDelaySec = 25 [default = 300]; // 5 minutes
+    // Time duration that we wait before we consider remote cluster enabled for load balancing purposes 
+    optional uint32 RemoteClusterEnabledDelaySec = 24 [default = 300]; // 5 minutes 
+    optional uint32 CloseClientSessionWithEnabledRemotePreferredClusterDelaySec = 25 [default = 300]; // 5 minutes 
 
     optional bool RoundRobinPartitionMapping = 26 [default = true];
 
diff --git a/ydb/public/api/grpc/draft/ydb_persqueue_v1.proto b/ydb/public/api/grpc/draft/ydb_persqueue_v1.proto
index 873ee38b3c..0cee327235 100644
--- a/ydb/public/api/grpc/draft/ydb_persqueue_v1.proto
+++ b/ydb/public/api/grpc/draft/ydb_persqueue_v1.proto
@@ -32,7 +32,7 @@ service PersQueueService {
      *        <----------------
      */
 
-    rpc StreamingWrite(stream StreamingWriteClientMessage) returns (stream StreamingWriteServerMessage);
+    rpc StreamingWrite(stream StreamingWriteClientMessage) returns (stream StreamingWriteServerMessage); 
 
     /**
      * Creates Read Session
diff --git a/ydb/public/api/protos/persqueue_error_codes_v1.proto b/ydb/public/api/protos/persqueue_error_codes_v1.proto
index c6658305c2..85fcd4cecf 100644
--- a/ydb/public/api/protos/persqueue_error_codes_v1.proto
+++ b/ydb/public/api/protos/persqueue_error_codes_v1.proto
@@ -38,6 +38,6 @@ enum ErrorCode {
     CLUSTER_DISABLED = 500020;
 
     WRONG_PARTITION_NUMBER = 500021;
-    PREFERRED_CLUSTER_MISMATCHED = 500022;
+    PREFERRED_CLUSTER_MISMATCHED = 500022; 
     ERROR = 500100;
 }
diff --git a/ydb/public/api/protos/ydb_persqueue_v1.proto b/ydb/public/api/protos/ydb_persqueue_v1.proto
index 93a7fb6c79..7bb35d73bf 100644
--- a/ydb/public/api/protos/ydb_persqueue_v1.proto
+++ b/ydb/public/api/protos/ydb_persqueue_v1.proto
@@ -5,17 +5,17 @@ import "ydb/public/api/protos/ydb_status_codes.proto";
 import "ydb/public/api/protos/ydb_issue_message.proto";
 import "ydb/public/api/protos/annotations/validation.proto";
 
-package Ydb.PersQueue.V1;
+package Ydb.PersQueue.V1; 
 
 option java_package = "com.yandex.ydb.persqueue";
-
+ 
 option cc_enable_arenas = true;
 
-// NOTE:
-// * We use 'ms' suffix instead of google.protobuf.Timestamp and google.protobuf.Duration in order to utilize
-// packed encoding ('message' types can't be packed encoded). In non-repeated fields we use 'ms' for consistency.
-// * Any message with non-empty 'issues' property leads to streaming RPC termination.
-
+// NOTE: 
+// * We use 'ms' suffix instead of google.protobuf.Timestamp and google.protobuf.Duration in order to utilize 
+// packed encoding ('message' types can't be packed encoded). In non-repeated fields we use 'ms' for consistency. 
+// * Any message with non-empty 'issues' property leads to streaming RPC termination. 
+ 
 enum Codec {
     CODEC_UNSPECIFIED = 0;
     CODEC_RAW = 1;
@@ -24,189 +24,189 @@ enum Codec {
     CODEC_ZSTD = 4;
 }
 
-message SessionMetaValue {
-    map<string, string> value = 1;
+message SessionMetaValue { 
+    map<string, string> value = 1; 
 }
 
-/**
- * Represents range [start_offset, end_offset).
- */
-message OffsetsRange {
-    int64 start_offset = 1;
-    int64 end_offset = 2;
+/** 
+ * Represents range [start_offset, end_offset). 
+ */ 
+message OffsetsRange { 
+    int64 start_offset = 1; 
+    int64 end_offset = 2; 
 }
 
 /**
- * Request for write session. Contains one of:
- *      InitRequest - handshake request.
- *      WriteRequest - portion of data to be written.
- *      UpdateTokenRequest - user credentials if update is needed.
+ * Request for write session. Contains one of: 
+ *      InitRequest - handshake request. 
+ *      WriteRequest - portion of data to be written. 
+ *      UpdateTokenRequest - user credentials if update is needed. 
  */
-message StreamingWriteClientMessage {
-    oneof client_message {
-        InitRequest init_request = 1;
-        WriteRequest write_request = 2;
-        UpdateTokenRequest update_token_request = 3;
-    }
-
-
+message StreamingWriteClientMessage { 
+    oneof client_message { 
+        InitRequest init_request = 1; 
+        WriteRequest write_request = 2; 
+        UpdateTokenRequest update_token_request = 3; 
+    } 
+
+ 
     // Handshake request that must be sent to server first.
-    message InitRequest {
+    message InitRequest { 
         // Path of topic to write to.
-        string topic = 1;
-        // message group identifier of client data stream a.k.a. sourceId.
-        string message_group_id = 2;
-        // Some user metadata attached to this write session.
-        map<string, string> session_meta = 3;
+        string topic = 1; 
+        // message group identifier of client data stream a.k.a. sourceId. 
+        string message_group_id = 2; 
+        // Some user metadata attached to this write session. 
+        map<string, string> session_meta = 3; 
         // Partition group to write to.
-        // Zero means any group.
-        int64 partition_group_id = 4;
-
-        int64 max_supported_block_format_version = 5;
-
-        string session_id = 100;
-        // 0 for first init message and incremental value for connect retries. Used for server logging.
-        int64 connection_attempt = 101;
-        // Opaque blob. Take last one from previous connect.
-        bytes connection_meta = 102;
-
-        // Optinal preferred cluster name. Sever will close session If preferred cluster is not server cluster and preferred cluster is enabled after delay TPQConfig::CloseClientSessionWithEnabledRemotePreferredClusterDelaySec
-        string preferred_cluster = 103;
-
-        // Sanity check option. When no writing activity is done in idle_timeout_sec seconds, then session will be destroyed. Zero means infinity.
-        int64 idle_timeout_ms = 200;
+        // Zero means any group. 
+        int64 partition_group_id = 4; 
+
+        int64 max_supported_block_format_version = 5; 
+
+        string session_id = 100; 
+        // 0 for first init message and incremental value for connect retries. Used for server logging. 
+        int64 connection_attempt = 101; 
+        // Opaque blob. Take last one from previous connect. 
+        bytes connection_meta = 102; 
+ 
+        // Optinal preferred cluster name. Sever will close session If preferred cluster is not server cluster and preferred cluster is enabled after delay TPQConfig::CloseClientSessionWithEnabledRemotePreferredClusterDelaySec 
+        string preferred_cluster = 103; 
+ 
+        // Sanity check option. When no writing activity is done in idle_timeout_sec seconds, then session will be destroyed. Zero means infinity. 
+        int64 idle_timeout_ms = 200; 
     }
 
-    // Represents portion of client messages.
-    message WriteRequest {
-        // Sequence numbers of messages in order that client will provide to server.
-        repeated int64 sequence_numbers = 2;
-        // Message creation timestamps for client messages.
-        // Same size as sequence_numbers.
-        repeated int64 created_at_ms = 3;
-        // Message creation timestamps for client messages.
-        // Same size as sequence_numbers.
-        repeated int64 sent_at_ms = 4;
-        // Client message sizes.
-        // Same size as sequence_numbers.
-        repeated int64 message_sizes = 5;
-
-        // Block must contain whole client message when it's size is not bigger that max_block_size.
-        // If message is bigger than max_block_size - it will be transferred as SIZE/max_block_size blocks. All of
-        // this blocks will be with block_count = 0 but not the last one - last one's block_count will be greater than 0;
-        // Blocks can be reordered upto max_flush_window_size of uncompressed data.
+    // Represents portion of client messages. 
+    message WriteRequest { 
+        // Sequence numbers of messages in order that client will provide to server. 
+        repeated int64 sequence_numbers = 2; 
+        // Message creation timestamps for client messages. 
+        // Same size as sequence_numbers. 
+        repeated int64 created_at_ms = 3; 
+        // Message creation timestamps for client messages. 
+        // Same size as sequence_numbers. 
+        repeated int64 sent_at_ms = 4; 
+        // Client message sizes. 
+        // Same size as sequence_numbers. 
+        repeated int64 message_sizes = 5; 
+ 
+        // Block must contain whole client message when it's size is not bigger that max_block_size. 
+        // If message is bigger than max_block_size - it will be transferred as SIZE/max_block_size blocks. All of 
+        // this blocks will be with block_count = 0 but not the last one - last one's block_count will be greater than 0; 
+        // Blocks can be reordered upto max_flush_window_size of uncompressed data. 
         // Each block contains concatenated client messages, compressed by chosen codec.
-        // If there is not full client message inside block, then all block contains only this part of message.
-        // blocks:      A A A B B B BCDE
-        // offset:      1 1 1 2 2 2 2
-        // part_number: 0 1 2 0 1 2 3
-        // count:       0 0 1 0 0 1 4
-
-        repeated int64 blocks_offsets = 6;
-        repeated int64 blocks_part_numbers = 7;
-        // How many complete messages and imcomplete messages end parts (one at most) this block contains
-        repeated int64 blocks_message_counts = 8;
-        repeated int64 blocks_uncompressed_sizes = 9;
-        // In block format version 0 each byte contains only block codec identifier
-        repeated bytes blocks_headers = 10;
-        repeated bytes blocks_data = 11;
+        // If there is not full client message inside block, then all block contains only this part of message. 
+        // blocks:      A A A B B B BCDE 
+        // offset:      1 1 1 2 2 2 2 
+        // part_number: 0 1 2 0 1 2 3 
+        // count:       0 0 1 0 0 1 4 
+ 
+        repeated int64 blocks_offsets = 6; 
+        repeated int64 blocks_part_numbers = 7; 
+        // How many complete messages and imcomplete messages end parts (one at most) this block contains 
+        repeated int64 blocks_message_counts = 8; 
+        repeated int64 blocks_uncompressed_sizes = 9; 
+        // In block format version 0 each byte contains only block codec identifier 
+        repeated bytes blocks_headers = 10; 
+        repeated bytes blocks_data = 11; 
     }
 
-    // In-session reauthentication and reauthorization, lets user increase session lifetime. You should wait for 'update_token_response' before sending next 'update_token_request'.
-    message UpdateTokenRequest {
-        string token = 1;
-    }
+    // In-session reauthentication and reauthorization, lets user increase session lifetime. You should wait for 'update_token_response' before sending next 'update_token_request'. 
+    message UpdateTokenRequest { 
+        string token = 1; 
+    } 
 }
 
 /**
- * Response for write session. Contains one of:
- *      InitResponse - correct handshake response.
- *      BatchWriteResponse - acknowledgment of storing client messages.
- *      UpdateTokenResponse - acknowledgment of reauthentication and reauthorization.
+ * Response for write session. Contains one of: 
+ *      InitResponse - correct handshake response. 
+ *      BatchWriteResponse - acknowledgment of storing client messages. 
+ *      UpdateTokenResponse - acknowledgment of reauthentication and reauthorization. 
  */
-message StreamingWriteServerMessage {
-    oneof server_message {
-        InitResponse init_response = 3;
-        BatchWriteResponse batch_write_response = 4;
-        UpdateTokenResponse update_token_response = 5;
-    }
-
-    // Server status of response.
-    Ydb.StatusIds.StatusCode status = 1;
-
-    // Issues if any.
-    repeated Ydb.Issue.IssueMessage issues = 2;
-
+message StreamingWriteServerMessage { 
+    oneof server_message { 
+        InitResponse init_response = 3; 
+        BatchWriteResponse batch_write_response = 4; 
+        UpdateTokenResponse update_token_response = 5; 
+    } 
+
+    // Server status of response. 
+    Ydb.StatusIds.StatusCode status = 1; 
+ 
+    // Issues if any. 
+    repeated Ydb.Issue.IssueMessage issues = 2; 
+ 
     // Response for handshake.
-    message InitResponse {
-        // Last persisted message's sequence number for this message group.
-        int64 last_sequence_number = 1;
+    message InitResponse { 
+        // Last persisted message's sequence number for this message group. 
+        int64 last_sequence_number = 1; 
         // Unique identifier of write session. Used for debug purposes.
         string session_id = 2;
         // Path of topic that matched for this write session. Used for debug purposes, will be the same as in Init request from client.
-        string topic = 3;
+        string topic = 3; 
         // Write session is established to this cluster. Client data will be in instance of topic in this cluster.
         string cluster = 4;
-        // Identifier of partition that is matched for this write session.
-        int64 partition_id = 5;
+        // Identifier of partition that is matched for this write session. 
+        int64 partition_id = 5; 
 
-        // Block (see StreamingWriteClientMessage.WriteRequest.blocks_data) format version supported by server or configured for a topic. Client must write data only with them.
-        int64 block_format_version = 6;
+        // Block (see StreamingWriteClientMessage.WriteRequest.blocks_data) format version supported by server or configured for a topic. Client must write data only with them. 
+        int64 block_format_version = 6; 
         // Client can only use compression codecs from this set to write messages to topic, session will be closed with BAD_REQUEST otherwise.
         repeated Codec supported_codecs = 10;
-
-        // Maximal flush window size choosed by server. Size of uncompressed data not sended to server must not be bigger than flush window size.
-        // In other words, this is maximal size of gap inside uncompressed data, which is not sended to server yet.
-        int64 max_flush_window_size = 7; // will be 2048kb
-        // How big blocks per stream could be(in uncompressed size). When block contains more than max_block_size of uncompressed data - block must be truncated.
-        int64 max_block_size = 8; // will be 512kb
-
-        // Opaque blob, used for fast reconnects.
-        bytes connection_meta = 9;
-    }
-
-    // Message that represents acknowledgment for sequence of client messages. This sequence is persisted together so write statistics is for messages batch.
-    message BatchWriteResponse {
-        // Sequence numbers of persisted client messages.
-        repeated int64 sequence_numbers = 1;
-        // Assigned partition offsets.
-        // Zero for skipped messages.
-        repeated int64 offsets = 2;
-        // Per message flag. False if message is written for the first time and True otherwise.
-        repeated bool already_written = 3;
-
-        // Assigned partition for all client messages inside this batch.
-        int64 partition_id = 4;
-
-        // Write statistics for this sequence of client messages.
-        WriteStatistics write_statistics = 5;
-    }
-
-    message UpdateTokenResponse {
+ 
+        // Maximal flush window size choosed by server. Size of uncompressed data not sended to server must not be bigger than flush window size. 
+        // In other words, this is maximal size of gap inside uncompressed data, which is not sended to server yet. 
+        int64 max_flush_window_size = 7; // will be 2048kb 
+        // How big blocks per stream could be(in uncompressed size). When block contains more than max_block_size of uncompressed data - block must be truncated. 
+        int64 max_block_size = 8; // will be 512kb 
+ 
+        // Opaque blob, used for fast reconnects. 
+        bytes connection_meta = 9; 
     }
 
+    // Message that represents acknowledgment for sequence of client messages. This sequence is persisted together so write statistics is for messages batch. 
+    message BatchWriteResponse { 
+        // Sequence numbers of persisted client messages. 
+        repeated int64 sequence_numbers = 1; 
+        // Assigned partition offsets. 
+        // Zero for skipped messages. 
+        repeated int64 offsets = 2; 
+        // Per message flag. False if message is written for the first time and True otherwise. 
+        repeated bool already_written = 3; 
+ 
+        // Assigned partition for all client messages inside this batch. 
+        int64 partition_id = 4; 
+ 
+        // Write statistics for this sequence of client messages. 
+        WriteStatistics write_statistics = 5; 
+    } 
+ 
+    message UpdateTokenResponse { 
+    } 
+ 
     // Message with write statistics.
-    message WriteStatistics {
+    message WriteStatistics { 
         // Time spent in persisting of data.
-        int64 persist_duration_ms = 1;
+        int64 persist_duration_ms = 1; 
         // Time spent in queue before persisting.
-        int64 queued_in_partition_duration_ms = 2;
+        int64 queued_in_partition_duration_ms = 2; 
         // Time spent awaiting for partition write quota.
-        int64 throttled_on_partition_duration_ms = 3;
-        // Time spent awaiting for topic write quota.
-        int64 throttled_on_topic_duration_ms = 4;
+        int64 throttled_on_partition_duration_ms = 3; 
+        // Time spent awaiting for topic write quota. 
+        int64 throttled_on_topic_duration_ms = 4; 
     }
-}
+} 
 
 
-message Path {
-    // Path of object (topic/consumer).
-    string path = 1;
-}
+message Path { 
+    // Path of object (topic/consumer). 
+    string path = 1; 
+} 
 
-message KeyValue {
-    string key = 1;
-    string value = 2;
+message KeyValue { 
+    string key = 1; 
+    string value = 2; 
 }
 
 /**
@@ -575,9 +575,9 @@ message StreamingReadServerMessageNew {
             // How many complete messages and imcomplete messages end parts (one at most) this block contains
             repeated int64 blocks_message_counts = 15;
             repeated int64 blocks_uncompressed_sizes = 16;
-            // In block format version 0 each byte contains only block codec identifier
-            repeated bytes blocks_headers = 17;
-            repeated bytes blocks_data = 18;
+            // In block format version 0 each byte contains only block codec identifier 
+            repeated bytes blocks_headers = 17; 
+            repeated bytes blocks_data = 18; 
 
             // Zero if this is not first portion of data after resume or provided by client cookie otherwise.
             int64 resume_cookie = 50;
diff --git a/ydb/public/sdk/cpp/client/ydb_persqueue_core/ut/ut_utils/sdk_test_setup.h b/ydb/public/sdk/cpp/client/ydb_persqueue_core/ut/ut_utils/sdk_test_setup.h
index 677eb8c03d..a2ab6f477c 100644
--- a/ydb/public/sdk/cpp/client/ydb_persqueue_core/ut/ut_utils/sdk_test_setup.h
+++ b/ydb/public/sdk/cpp/client/ydb_persqueue_core/ut/ut_utils/sdk_test_setup.h
@@ -1,14 +1,14 @@
-#pragma once
-#include "test_server.h"
+#pragma once 
+#include "test_server.h" 
 #include <ydb/library/persqueue/topic_parser_public/topic_parser.h>
 #include <library/cpp/logger/log.h>
 #include <util/system/tempfile.h>
+ 
+#define TEST_CASE_NAME (this->Name_) 
+ 
+namespace NPersQueue { 
 
-#define TEST_CASE_NAME (this->Name_)
-
-namespace NPersQueue {
-
-class SDKTestSetup {
+class SDKTestSetup { 
 protected:
     TString TestCaseName;
 
@@ -19,10 +19,10 @@ protected:
 
     TLog Log = TLog("cerr");
 
-public:
+public: 
     SDKTestSetup(const TString& testCaseName, bool start = true)
         : TestCaseName(testCaseName)
-    {
+    { 
         InitOptions();
         if (start) {
             Start();
@@ -31,14 +31,14 @@ public:
 
     void InitOptions() {
         Log.SetFormatter([testCaseName = TestCaseName](ELogPriority priority, TStringBuf message) {
-            return TStringBuilder() << TInstant::Now() << " :" << testCaseName << " " << priority << ": " << message << Endl;
-        });
-        Server.GrpcServerOptions.SetGRpcShutdownDeadline(TDuration::Max());
-        // Default TTestServer value for 'MaxReadCookies' is 10. With this value the tests are flapping with two errors:
-        // 1. 'got more than 10 unordered cookies to commit 12'
-        // 2. 'got more than 10 uncommitted reads'
-        Server.ServerSettings.PQConfig.Clear();
-        Server.ServerSettings.PQConfig.SetEnabled(true);
+            return TStringBuilder() << TInstant::Now() << " :" << testCaseName << " " << priority << ": " << message << Endl; 
+        }); 
+        Server.GrpcServerOptions.SetGRpcShutdownDeadline(TDuration::Max()); 
+        // Default TTestServer value for 'MaxReadCookies' is 10. With this value the tests are flapping with two errors: 
+        // 1. 'got more than 10 unordered cookies to commit 12' 
+        // 2. 'got more than 10 uncommitted reads' 
+        Server.ServerSettings.PQConfig.Clear(); 
+        Server.ServerSettings.PQConfig.SetEnabled(true); 
         Server.ServerSettings.PQConfig.SetRemoteClusterEnabledDelaySec(1);
         Server.ServerSettings.PQConfig.SetCloseClientSessionWithEnabledRemotePreferredClusterDelaySec(1);
         Server.ServerSettings.PQClusterDiscoveryConfig.SetEnabled(true);
@@ -53,7 +53,7 @@ public:
     void Start(bool waitInit = true, bool addBrokenDatacenter = false) {
         Server.StartServer(false);
         //Server.EnableLogs({NKikimrServices::PQ_WRITE_PROXY, NKikimrServices::PQ_READ_PROXY});
-        Server.AnnoyingClient->InitRoot();
+        Server.AnnoyingClient->InitRoot(); 
         if (DataCenters.empty()) {
             THashMap<TString, NKikimr::NPersQueueTests::TPQTestClusterInfo> dataCenters;
             dataCenters.emplace("dc1", NKikimr::NPersQueueTests::TPQTestClusterInfo{TStringBuilder() << "localhost:" << Server.GrpcPort, true});
@@ -64,33 +64,33 @@ public:
         } else {
             Server.AnnoyingClient->InitDCs(DataCenters, LocalDC);
         }
-        Server.AnnoyingClient->InitSourceIds();
+        Server.AnnoyingClient->InitSourceIds(); 
         CreateTopic(GetTestTopic(), GetLocalCluster());
         if (waitInit) {
             Server.WaitInit(GetTestTopic());
         }
-    }
-
+    } 
+ 
     TString GetTestTopic() const {
-        return "topic1";
-    }
-
+        return "topic1"; 
+    } 
+ 
     TString GetTestClient() const {
-        return "test-reader";
-    }
-
+        return "test-reader"; 
+    } 
+ 
     TString GetTestMessageGroupId() const {
-        return "test-message-group-id";
-    }
-
+        return "test-message-group-id"; 
+    } 
+ 
     TString GetLocalCluster() const {
         return LocalDC;
-    }
-
+    } 
+ 
     ui16 GetGrpcPort() const {
         return Server.GrpcPort;
     }
-
+ 
     NGrpc::TServerOptions& GetGrpcServerOptions() {
         return Server.GrpcServerOptions;
     }
@@ -102,11 +102,11 @@ public:
         Server.ServerSettings.NetClassifierConfig.SetNetDataFilePath(NetDataFile->Name());
     }
 
-
-    TLog& GetLog() {
-        return Log;
-    }
-
+ 
+    TLog& GetLog() { 
+        return Log; 
+    } 
+ 
     template <class TConsumerOrProducer>
     void Start(const THolder<TConsumerOrProducer>& obj) {
         auto startFuture = obj->Start();
@@ -198,5 +198,5 @@ public:
         UNIT_ASSERT_C(describeResult->Record.GetPathDescription().HasPersQueueGroup(), describeResult->Record);
         Server.AnnoyingClient->KillTablet(*Server.CleverServer, describeResult->Record.GetPathDescription().GetPersQueueGroup().GetBalancerTabletID());
     }
-};
-}
+}; 
+} 
diff --git a/ydb/public/sdk/cpp/client/ydb_persqueue_core/ut/ut_utils/test_server.h b/ydb/public/sdk/cpp/client/ydb_persqueue_core/ut/ut_utils/test_server.h
index 250ce03620..9e43a7c42e 100644
--- a/ydb/public/sdk/cpp/client/ydb_persqueue_core/ut/ut_utils/test_server.h
+++ b/ydb/public/sdk/cpp/client/ydb_persqueue_core/ut/ut_utils/test_server.h
@@ -69,7 +69,7 @@ public:
 
     void EnableLogs(const TVector<NKikimrServices::EServiceKikimr> services,
                     NActors::NLog::EPriority prio = NActors::NLog::PRI_DEBUG) {
-        Y_VERIFY(CleverServer != nullptr, "Start server before enabling logs");
+        Y_VERIFY(CleverServer != nullptr, "Start server before enabling logs"); 
         for (auto s : services) {
             CleverServer->GetRuntime()->SetLogPriority(s, prio);
         }
diff --git a/ydb/services/persqueue_v1/grpc_pq_actor.h b/ydb/services/persqueue_v1/grpc_pq_actor.h
index 65c8aca1db..1fc46216bb 100644
--- a/ydb/services/persqueue_v1/grpc_pq_actor.h
+++ b/ydb/services/persqueue_v1/grpc_pq_actor.h
@@ -52,14 +52,14 @@ const TString& TopicPrefix(const TActorContext& ctx);
 
 static const TDuration CHECK_ACL_DELAY = TDuration::Minutes(5);
 
-// Codec ID size in bytes
-constexpr ui32 CODEC_ID_SIZE = 1;
+// Codec ID size in bytes 
+constexpr ui32 CODEC_ID_SIZE = 1; 
+ 
 
-
-template<typename TItem0, typename... TItems>
-bool AllEqual(const TItem0& item0, const TItems&... items) {
-    return ((items == item0) && ... && true);
-}
+template<typename TItem0, typename... TItems> 
+bool AllEqual(const TItem0& item0, const TItems&... items) { 
+    return ((items == item0) && ... && true); 
+} 
 
 static inline bool InternalErrorCode(PersQueue::ErrorCode::ErrorCode errorCode) {
     switch(errorCode) {
@@ -98,7 +98,7 @@ struct TCommitCookie {
 
 struct TEvPQProxy {
     enum EEv {
-        EvWriteInit = EventSpaceBegin(TKikimrEvents::ES_PQ_PROXY_NEW), // TODO: Replace 'NEW' with version or something
+        EvWriteInit = EventSpaceBegin(TKikimrEvents::ES_PQ_PROXY_NEW), // TODO: Replace 'NEW' with version or something 
         EvWrite,
         EvDone,
         EvReadInit,
@@ -123,7 +123,7 @@ struct TEvPQProxy {
         EvUpdateClusters,
         EvQueryCompiled,
         EvSessionDead,
-        EvSessionSetPreferredCluster,
+        EvSessionSetPreferredCluster, 
         EvScheduleUpdateClusters,
         EvDeadlineExceeded,
         EvGetStatus,
@@ -148,14 +148,14 @@ struct TEvPQProxy {
         TTopicTabletsPairs TopicAndTablets;
     };
 
-    struct TEvSessionSetPreferredCluster : public NActors::TEventLocal<TEvSessionSetPreferredCluster, EvSessionSetPreferredCluster> {
-        TEvSessionSetPreferredCluster(const ui64 cookie, const TString& preferredCluster)
-            : Cookie(cookie)
-            , PreferredCluster(preferredCluster)
-        {}
-        const ui64 Cookie;
-        const TString PreferredCluster;
-    };
+    struct TEvSessionSetPreferredCluster : public NActors::TEventLocal<TEvSessionSetPreferredCluster, EvSessionSetPreferredCluster> { 
+        TEvSessionSetPreferredCluster(const ui64 cookie, const TString& preferredCluster) 
+            : Cookie(cookie) 
+            , PreferredCluster(preferredCluster) 
+        {} 
+        const ui64 Cookie; 
+        const TString PreferredCluster; 
+    }; 
 
     struct TEvSessionDead : public NActors::TEventLocal<TEvSessionDead, EvSessionDead> {
         TEvSessionDead(const ui64 cookie)
@@ -196,21 +196,21 @@ struct TEvPQProxy {
 
 
     struct TEvWriteInit : public NActors::TEventLocal<TEvWriteInit, EvWriteInit> {
-        TEvWriteInit(PersQueue::V1::StreamingWriteClientMessage&& req, const TString& peerName)
+        TEvWriteInit(PersQueue::V1::StreamingWriteClientMessage&& req, const TString& peerName) 
             : Request(std::move(req))
             , PeerName(peerName)
         { }
 
-        PersQueue::V1::StreamingWriteClientMessage Request;
+        PersQueue::V1::StreamingWriteClientMessage Request; 
         TString PeerName;
     };
 
     struct TEvWrite : public NActors::TEventLocal<TEvWrite, EvWrite> {
-        explicit TEvWrite(PersQueue::V1::StreamingWriteClientMessage&& req)
+        explicit TEvWrite(PersQueue::V1::StreamingWriteClientMessage&& req) 
             : Request(std::move(req))
         { }
 
-        PersQueue::V1::StreamingWriteClientMessage Request;
+        PersQueue::V1::StreamingWriteClientMessage Request; 
     };
 
     struct TEvDone : public NActors::TEventLocal<TEvDone, EvDone> {
@@ -244,14 +244,14 @@ struct TEvPQProxy {
         ui64 ReadTimestampMs;
     };
 
-    struct TEvUpdateToken : public NActors::TEventLocal<TEvUpdateToken, EvUpdateToken> {
-        explicit TEvUpdateToken(PersQueue::V1::StreamingWriteClientMessage&& req)
-            : Request(std::move(req))
-        { }
-
-        PersQueue::V1::StreamingWriteClientMessage Request;
-    };
-
+    struct TEvUpdateToken : public NActors::TEventLocal<TEvUpdateToken, EvUpdateToken> { 
+        explicit TEvUpdateToken(PersQueue::V1::StreamingWriteClientMessage&& req) 
+            : Request(std::move(req)) 
+        { } 
+ 
+        PersQueue::V1::StreamingWriteClientMessage Request; 
+    }; 
+ 
     struct TEvCloseSession : public NActors::TEventLocal<TEvCloseSession, EvCloseSession> {
         TEvCloseSession(const TString& reason, const PersQueue::ErrorCode::ErrorCode errorCode)
             : Reason(reason)
@@ -453,7 +453,7 @@ struct TEvPQProxy {
 
 /// WRITE ACTOR
 class TWriteSessionActor : public NActors::TActorBootstrapped<TWriteSessionActor> {
-using IContext = NGRpcServer::IGRpcStreamingContext<PersQueue::V1::StreamingWriteClientMessage, PersQueue::V1::StreamingWriteServerMessage>;
+using IContext = NGRpcServer::IGRpcStreamingContext<PersQueue::V1::StreamingWriteClientMessage, PersQueue::V1::StreamingWriteServerMessage>; 
 using TEvDescribeTopicsResponse = NMsgBusProxy::NPqMetaCacheV2::TEvPqNewMetaCache::TEvDescribeTopicsResponse;
 using TEvDescribeTopicsRequest = NMsgBusProxy::NPqMetaCacheV2::TEvPqNewMetaCache::TEvDescribeTopicsRequest;
 
@@ -515,11 +515,11 @@ private:
     void Handle(NKqp::TEvKqp::TEvProcessResponse::TPtr &ev, const TActorContext &ctx);
 
     void CheckACL(const TActorContext& ctx);
-    // Requests fresh ACL from 'SchemeCache'
+    // Requests fresh ACL from 'SchemeCache' 
     void InitCheckSchema(const TActorContext& ctx, bool needWaitSchema = false);
     void Handle(TEvPQProxy::TEvWriteInit::TPtr& ev,  const NActors::TActorContext& ctx);
     void Handle(TEvPQProxy::TEvWrite::TPtr& ev, const NActors::TActorContext& ctx);
-    void Handle(TEvPQProxy::TEvUpdateToken::TPtr& ev, const NActors::TActorContext& ctx);
+    void Handle(TEvPQProxy::TEvUpdateToken::TPtr& ev, const NActors::TActorContext& ctx); 
     void Handle(TEvPQProxy::TEvDone::TPtr& ev, const NActors::TActorContext& ctx);
     void Handle(TEvTxProxySchemeCache::TEvNavigateKeySetResult::TPtr& ev, const TActorContext& ctx);
     void Handle(TEvDescribeTopicsResponse::TPtr& ev, const TActorContext& ctx);
@@ -581,8 +581,8 @@ private:
     NPersQueue::TConverterPtr TopicConverter;
     ui32 Partition;
     ui32 PreferedPartition;
-    // 'SourceId' is called 'MessageGroupId' since gRPC data plane API v1
-    TString SourceId; // TODO: Replace with 'MessageGroupId' everywhere
+    // 'SourceId' is called 'MessageGroupId' since gRPC data plane API v1 
+    TString SourceId; // TODO: Replace with 'MessageGroupId' everywhere 
     TString EscapedSourceId;
     ui32 Hash = 0;
 
@@ -592,7 +592,7 @@ private:
     ui32 NumReserveBytesRequests;
 
     THolder<TAclWrapper> ACL;
-
+ 
     struct TWriteRequestBatchInfo: public TSimpleRefCount<TWriteRequestBatchInfo> {
         using TPtr = TIntrusivePtr<TWriteRequestBatchInfo>;
 
@@ -615,7 +615,7 @@ private:
     // Requests that is already sent to partition actor
     std::deque<TWriteRequestBatchInfo::TPtr> SentMessages;
 
-
+ 
     bool WritesDone;
 
     THashMap<ui32, ui64> PartitionToTablet;
@@ -639,9 +639,9 @@ private:
 
     TIntrusivePtr<NACLib::TUserToken> Token;
     TString Auth;
-    // Got 'update_token_request', authentication or authorization in progress or 'update_token_response' is not sent yet. Only single 'update_token_request' is allowed inflight
-    bool UpdateTokenInProgress;
-    bool UpdateTokenAuthenticated;
+    // Got 'update_token_request', authentication or authorization in progress or 'update_token_response' is not sent yet. Only single 'update_token_request' is allowed inflight 
+    bool UpdateTokenInProgress; 
+    bool UpdateTokenAuthenticated; 
     bool ACLCheckInProgress;
     bool FirstACLCheck;
     bool RequestNotChecked;
@@ -651,8 +651,8 @@ private:
     ui64 BalancerTabletId;
     TActorId PipeToBalancer;
 
-    // PQ tablet configuration that we get at the time of session initialization
-    NKikimrPQ::TPQTabletConfig InitialPQTabletConfig;
+    // PQ tablet configuration that we get at the time of session initialization 
+    NKikimrPQ::TPQTabletConfig InitialPQTabletConfig; 
 
     NKikimrPQClient::TDataChunk InitMeta;
     TString LocalDC;
diff --git a/ydb/services/persqueue_v1/grpc_pq_codecs.cpp b/ydb/services/persqueue_v1/grpc_pq_codecs.cpp
index d9cbfeb411..5415fc1576 100644
--- a/ydb/services/persqueue_v1/grpc_pq_codecs.cpp
+++ b/ydb/services/persqueue_v1/grpc_pq_codecs.cpp
@@ -1,30 +1,30 @@
-#include "grpc_pq_codecs.h"
+#include "grpc_pq_codecs.h" 
 #include <ydb/core/protos/grpc_pq_old.pb.h>
 #include <ydb/library/persqueue/topic_parser/topic_parser.h>
 
 #include <util/generic/algorithm.h>
-#include <util/generic/fwd.h>
-#include <util/string/builder.h>
-
-namespace NKikimr::NGRpcProxy {
-    bool ValidateWriteWithCodec(const NKikimrPQ::TPQTabletConfig& pqTabletConfig, const ui32 codecID, TString& error) {
-        error.clear();
-
-        if (pqTabletConfig.has_codecs() /* empty codecs that any codec is allowed for migration purposes */) {
-            const auto& ids = pqTabletConfig.codecs().ids();
-            if (!ids.empty() && Find(ids, codecID) == ids.end()) {
-                const auto& names = pqTabletConfig.codecs().codecs();
-                Y_VERIFY(ids.size() == names.size(), "PQ tabled supported codecs configuration is invalid");
-                TStringBuilder errorBuilder;
-                errorBuilder << "given codec (id " << static_cast<i32>(codecID) << ") is not configured for the topic. Configured codecs are " << names[0] << " (id " << ids[0] << ")";
-                for (i32 i = 1; i != ids.size(); ++i) {
-                    errorBuilder << ", " << names[i] << " (id " << ids[i] << ")";
-                }
-                error = errorBuilder;
-                return false;
-            }
-        }
-
-        return true;
-    }
-}
+#include <util/generic/fwd.h> 
+#include <util/string/builder.h> 
+ 
+namespace NKikimr::NGRpcProxy { 
+    bool ValidateWriteWithCodec(const NKikimrPQ::TPQTabletConfig& pqTabletConfig, const ui32 codecID, TString& error) { 
+        error.clear(); 
+ 
+        if (pqTabletConfig.has_codecs() /* empty codecs that any codec is allowed for migration purposes */) { 
+            const auto& ids = pqTabletConfig.codecs().ids(); 
+            if (!ids.empty() && Find(ids, codecID) == ids.end()) { 
+                const auto& names = pqTabletConfig.codecs().codecs(); 
+                Y_VERIFY(ids.size() == names.size(), "PQ tabled supported codecs configuration is invalid"); 
+                TStringBuilder errorBuilder; 
+                errorBuilder << "given codec (id " << static_cast<i32>(codecID) << ") is not configured for the topic. Configured codecs are " << names[0] << " (id " << ids[0] << ")"; 
+                for (i32 i = 1; i != ids.size(); ++i) { 
+                    errorBuilder << ", " << names[i] << " (id " << ids[i] << ")"; 
+                } 
+                error = errorBuilder; 
+                return false; 
+            } 
+        } 
+ 
+        return true; 
+    } 
+} 
diff --git a/ydb/services/persqueue_v1/grpc_pq_codecs.h b/ydb/services/persqueue_v1/grpc_pq_codecs.h
index 005aeaa2d8..c3d2cb3734 100644
--- a/ydb/services/persqueue_v1/grpc_pq_codecs.h
+++ b/ydb/services/persqueue_v1/grpc_pq_codecs.h
@@ -1,8 +1,8 @@
-#pragma once
+#pragma once 
 #include <ydb/core/protos/flat_scheme_op.pb.h>
-#include <util/generic/fwd.h>
-
-namespace NKikimr::NGRpcProxy {
-    // Validates that client can safely write to the topic data compressed with specific codec
-    bool ValidateWriteWithCodec(const NKikimrPQ::TPQTabletConfig& pqTabletConfig, const ui32 codecID, TString& error);
-}
+#include <util/generic/fwd.h> 
+ 
+namespace NKikimr::NGRpcProxy { 
+    // Validates that client can safely write to the topic data compressed with specific codec 
+    bool ValidateWriteWithCodec(const NKikimrPQ::TPQTabletConfig& pqTabletConfig, const ui32 codecID, TString& error); 
+} 
diff --git a/ydb/services/persqueue_v1/grpc_pq_read.cpp b/ydb/services/persqueue_v1/grpc_pq_read.cpp
index 6b7e72fdd0..bb6137d99c 100644
--- a/ydb/services/persqueue_v1/grpc_pq_read.cpp
+++ b/ydb/services/persqueue_v1/grpc_pq_read.cpp
@@ -17,7 +17,7 @@ namespace V1 {
 
 ///////////////////////////////////////////////////////////////////////////////
 
-using namespace PersQueue::V1;
+using namespace PersQueue::V1; 
 
 
 
diff --git a/ydb/services/persqueue_v1/grpc_pq_read_actor.cpp b/ydb/services/persqueue_v1/grpc_pq_read_actor.cpp
index 654edfcfcd..384d631809 100644
--- a/ydb/services/persqueue_v1/grpc_pq_read_actor.cpp
+++ b/ydb/services/persqueue_v1/grpc_pq_read_actor.cpp
@@ -32,7 +32,7 @@ using namespace NMsgBusProxy;
 namespace NGRpcProxy {
 namespace V1 {
 
-using namespace PersQueue::V1;
+using namespace PersQueue::V1; 
 
 #define PQ_LOG_PREFIX "session cookie " << Cookie << " consumer " << ClientPath << " session " << Session
 
@@ -2982,8 +2982,8 @@ Ydb::StatusIds::StatusCode ConvertPersQueueInternalCodeToStatus(const PersQueue:
         case INITIALIZING:
         case CLUSTER_DISABLED:
             return Ydb::StatusIds::UNAVAILABLE;
-        case PREFERRED_CLUSTER_MISMATCHED:
-            return Ydb::StatusIds::ABORTED;
+        case PREFERRED_CLUSTER_MISMATCHED: 
+            return Ydb::StatusIds::ABORTED; 
         case OVERLOAD:
             return Ydb::StatusIds::OVERLOADED;
         case BAD_REQUEST:
diff --git a/ydb/services/persqueue_v1/grpc_pq_write.cpp b/ydb/services/persqueue_v1/grpc_pq_write.cpp
index 5f17a2f3ab..816cc63579 100644
--- a/ydb/services/persqueue_v1/grpc_pq_write.cpp
+++ b/ydb/services/persqueue_v1/grpc_pq_write.cpp
@@ -14,7 +14,7 @@ namespace NKikimr {
 namespace NGRpcProxy {
 namespace V1 {
 
-using namespace PersQueue::V1;
+using namespace PersQueue::V1; 
 
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -65,7 +65,7 @@ void TPQWriteService::Handle(NNetClassifier::TEvNetClassifier::TEvClassifierUpda
 }
 
 
-void TPQWriteService::Handle(NPQ::NClusterTracker::TEvClusterTracker::TEvClustersUpdate::TPtr& ev, const TActorContext& ctx) {
+void TPQWriteService::Handle(NPQ::NClusterTracker::TEvClusterTracker::TEvClustersUpdate::TPtr& ev, const TActorContext& ctx) { 
     Y_VERIFY(ev->Get()->ClustersList);
     Y_VERIFY(ev->Get()->ClustersList->Clusters.size());
 
@@ -74,92 +74,92 @@ void TPQWriteService::Handle(NPQ::NClusterTracker::TEvClusterTracker::TEvCluster
     LocalCluster = "";
     Enabled = false;
 
-    // Rebalance load on installation clusters: if preferred cluster is enabled and session is alive long enough close it so client can recreate it in preferred cluster
-    auto remoteClusterEnabledDelay = TDuration::Seconds(AppData(ctx)->PQConfig.GetRemoteClusterEnabledDelaySec());
-    auto closeClientSessionWithEnabledRemotePreferredClusterDelay = TDuration::Seconds(AppData(ctx)->PQConfig.GetCloseClientSessionWithEnabledRemotePreferredClusterDelaySec());
-    const auto clustersListUpdatedAt = ev->Get()->ClustersListUpdateTimestamp ? *ev->Get()->ClustersListUpdateTimestamp : TInstant::Now();
-    THashSet<TString> remoteClusters;
-    THashSet<TString> rebalanceClusters;
-    for (const auto& cluster : clusters) {
-        if (cluster.IsLocal) {
-            LocalCluster = cluster.Name;
-            Enabled = cluster.IsEnabled;
-            continue;
-        }
-
-        remoteClusters.emplace(cluster.Name);
-
-        if (!cluster.IsEnabled) {
-            ClustersEnabledAt.erase(cluster.Name);
-            continue;
-        }
-
-        if (!ClustersEnabledAt.contains(cluster.Name)) {
-            ClustersEnabledAt[cluster.Name] = clustersListUpdatedAt;
-        }
-
-        const bool readyToCreateSessions = ClustersEnabledAt[cluster.Name] <= (TInstant::Now() - remoteClusterEnabledDelay);
-        if (readyToCreateSessions) {
-            rebalanceClusters.emplace(cluster.Name);
-        }
-    }
-
-    if (!Enabled) {
-        for (auto it = Sessions.begin(); it != Sessions.end(); ++it) {
-            Send(it->second, new TEvPQProxy::TEvDieCommand("cluster disabled", PersQueue::ErrorCode::CLUSTER_DISABLED));
-        }
-        return;
-    }
-
-    for (const auto& sessionsByPreferredCluster : SessionsByRemotePreferredCluster) {
-        const auto& cluster = sessionsByPreferredCluster.first;
-        if (rebalanceClusters.contains(cluster) || !remoteClusters.contains(cluster)) {
-            const TString closeReason = TStringBuilder() << "Session preferred cluster " << cluster.Quote()
-                << (remoteClusters.contains(cluster) ? " is enabled for at least " + ToString(closeClientSessionWithEnabledRemotePreferredClusterDelay) : " is unknown")
-                << " and session is older than " << closeClientSessionWithEnabledRemotePreferredClusterDelay;
-
-            const auto closeUpToCreatedAt = TInstant::Now() - closeClientSessionWithEnabledRemotePreferredClusterDelay;
-
-            for (const auto& session : sessionsByPreferredCluster.second) {
-                const auto& createdAt = session.second;
-                if (createdAt <= closeUpToCreatedAt) {
-                    const auto& workerID = Sessions[session.first];
-                    Send(workerID, new TEvPQProxy::TEvDieCommand(closeReason, PersQueue::ErrorCode::PREFERRED_CLUSTER_MISMATCHED));
-                }
+    // Rebalance load on installation clusters: if preferred cluster is enabled and session is alive long enough close it so client can recreate it in preferred cluster 
+    auto remoteClusterEnabledDelay = TDuration::Seconds(AppData(ctx)->PQConfig.GetRemoteClusterEnabledDelaySec()); 
+    auto closeClientSessionWithEnabledRemotePreferredClusterDelay = TDuration::Seconds(AppData(ctx)->PQConfig.GetCloseClientSessionWithEnabledRemotePreferredClusterDelaySec()); 
+    const auto clustersListUpdatedAt = ev->Get()->ClustersListUpdateTimestamp ? *ev->Get()->ClustersListUpdateTimestamp : TInstant::Now(); 
+    THashSet<TString> remoteClusters; 
+    THashSet<TString> rebalanceClusters; 
+    for (const auto& cluster : clusters) { 
+        if (cluster.IsLocal) { 
+            LocalCluster = cluster.Name; 
+            Enabled = cluster.IsEnabled; 
+            continue; 
+        } 
+
+        remoteClusters.emplace(cluster.Name); 
+ 
+        if (!cluster.IsEnabled) { 
+            ClustersEnabledAt.erase(cluster.Name); 
+            continue; 
+        } 
+ 
+        if (!ClustersEnabledAt.contains(cluster.Name)) { 
+            ClustersEnabledAt[cluster.Name] = clustersListUpdatedAt; 
+        } 
+ 
+        const bool readyToCreateSessions = ClustersEnabledAt[cluster.Name] <= (TInstant::Now() - remoteClusterEnabledDelay); 
+        if (readyToCreateSessions) { 
+            rebalanceClusters.emplace(cluster.Name); 
+        } 
+    } 
+ 
+    if (!Enabled) { 
+        for (auto it = Sessions.begin(); it != Sessions.end(); ++it) { 
+            Send(it->second, new TEvPQProxy::TEvDieCommand("cluster disabled", PersQueue::ErrorCode::CLUSTER_DISABLED)); 
+        } 
+        return; 
+    } 
+ 
+    for (const auto& sessionsByPreferredCluster : SessionsByRemotePreferredCluster) { 
+        const auto& cluster = sessionsByPreferredCluster.first; 
+        if (rebalanceClusters.contains(cluster) || !remoteClusters.contains(cluster)) { 
+            const TString closeReason = TStringBuilder() << "Session preferred cluster " << cluster.Quote() 
+                << (remoteClusters.contains(cluster) ? " is enabled for at least " + ToString(closeClientSessionWithEnabledRemotePreferredClusterDelay) : " is unknown") 
+                << " and session is older than " << closeClientSessionWithEnabledRemotePreferredClusterDelay; 
+ 
+            const auto closeUpToCreatedAt = TInstant::Now() - closeClientSessionWithEnabledRemotePreferredClusterDelay; 
+ 
+            for (const auto& session : sessionsByPreferredCluster.second) { 
+                const auto& createdAt = session.second; 
+                if (createdAt <= closeUpToCreatedAt) { 
+                    const auto& workerID = Sessions[session.first]; 
+                    Send(workerID, new TEvPQProxy::TEvDieCommand(closeReason, PersQueue::ErrorCode::PREFERRED_CLUSTER_MISMATCHED)); 
+                } 
             }
         }
     }
 }
 
-void TPQWriteService::Handle(TEvPQProxy::TEvSessionSetPreferredCluster::TPtr& ev, const TActorContext& ctx) {
-    const auto& cookie = ev->Get()->Cookie;
-    const auto& preferredCluster = ev->Get()->PreferredCluster;
-    if (!Sessions.contains(cookie)) {
-        LOG_ERROR_S(ctx, NKikimrServices::PQ_WRITE_PROXY, TStringBuilder() << "Got TEvSessionSetPreferredCluster message from session with cookie " << cookie << " that is not in session collection");
-        return;
-    }
-    if (!preferredCluster.empty() && *LocalCluster != preferredCluster) {
-        SessionsByRemotePreferredCluster[preferredCluster][cookie] = TInstant::Now();
-        RemotePreferredClusterBySessionCookie[cookie] = std::move(preferredCluster);
-    }
-}
+void TPQWriteService::Handle(TEvPQProxy::TEvSessionSetPreferredCluster::TPtr& ev, const TActorContext& ctx) { 
+    const auto& cookie = ev->Get()->Cookie; 
+    const auto& preferredCluster = ev->Get()->PreferredCluster; 
+    if (!Sessions.contains(cookie)) { 
+        LOG_ERROR_S(ctx, NKikimrServices::PQ_WRITE_PROXY, TStringBuilder() << "Got TEvSessionSetPreferredCluster message from session with cookie " << cookie << " that is not in session collection"); 
+        return; 
+    } 
+    if (!preferredCluster.empty() && *LocalCluster != preferredCluster) { 
+        SessionsByRemotePreferredCluster[preferredCluster][cookie] = TInstant::Now(); 
+        RemotePreferredClusterBySessionCookie[cookie] = std::move(preferredCluster); 
+    } 
+} 
 
 void TPQWriteService::Handle(TEvPQProxy::TEvSessionDead::TPtr& ev, const TActorContext&) {
-    const auto& cookie = ev->Get()->Cookie;
-    Sessions.erase(cookie);
-    if (RemotePreferredClusterBySessionCookie.contains(cookie)) {
-        const auto& preferredCluster = RemotePreferredClusterBySessionCookie[cookie];
-        SessionsByRemotePreferredCluster[preferredCluster].erase(cookie);
-        if (SessionsByRemotePreferredCluster[preferredCluster].empty()) {
-            SessionsByRemotePreferredCluster.erase(preferredCluster);
-        }
-        RemotePreferredClusterBySessionCookie.erase(cookie);
-    }
+    const auto& cookie = ev->Get()->Cookie; 
+    Sessions.erase(cookie); 
+    if (RemotePreferredClusterBySessionCookie.contains(cookie)) { 
+        const auto& preferredCluster = RemotePreferredClusterBySessionCookie[cookie]; 
+        SessionsByRemotePreferredCluster[preferredCluster].erase(cookie); 
+        if (SessionsByRemotePreferredCluster[preferredCluster].empty()) { 
+            SessionsByRemotePreferredCluster.erase(preferredCluster); 
+        } 
+        RemotePreferredClusterBySessionCookie.erase(cookie); 
+    } 
 }
 
 
-StreamingWriteServerMessage FillWriteResponse(const TString& errorReason, const PersQueue::ErrorCode::ErrorCode code) {
-    StreamingWriteServerMessage res;
+StreamingWriteServerMessage FillWriteResponse(const TString& errorReason, const PersQueue::ErrorCode::ErrorCode code) { 
+    StreamingWriteServerMessage res; 
     FillIssue(res.add_issues(), code, errorReason);
     res.set_status(ConvertPersQueueInternalCodeToStatus(code));
     return res;
diff --git a/ydb/services/persqueue_v1/grpc_pq_write.h b/ydb/services/persqueue_v1/grpc_pq_write.h
index 73148388b2..d18355dc60 100644
--- a/ydb/services/persqueue_v1/grpc_pq_write.h
+++ b/ydb/services/persqueue_v1/grpc_pq_write.h
@@ -43,9 +43,9 @@ private:
     STFUNC(StateFunc) {
         switch (ev->GetTypeRewrite()) {
             HFunc(NKikimr::NGRpcService::TEvStreamPQWriteRequest, Handle);
-            HFunc(NPQ::NClusterTracker::TEvClusterTracker::TEvClustersUpdate, Handle);
+            HFunc(NPQ::NClusterTracker::TEvClusterTracker::TEvClustersUpdate, Handle); 
             HFunc(TEvPQProxy::TEvSessionDead, Handle);
-            HFunc(TEvPQProxy::TEvSessionSetPreferredCluster, Handle);
+            HFunc(TEvPQProxy::TEvSessionSetPreferredCluster, Handle); 
             HFunc(NNetClassifier::TEvNetClassifier::TEvClassifierUpdate, Handle);
 
         }
@@ -53,10 +53,10 @@ private:
 
 private:
     void Handle(NKikimr::NGRpcService::TEvStreamPQWriteRequest::TPtr& ev, const TActorContext& ctx);
-    void Handle(NPQ::NClusterTracker::TEvClusterTracker::TEvClustersUpdate::TPtr& ev, const TActorContext& ctx);
+    void Handle(NPQ::NClusterTracker::TEvClusterTracker::TEvClustersUpdate::TPtr& ev, const TActorContext& ctx); 
     void Handle(NNetClassifier::TEvNetClassifier::TEvClassifierUpdate::TPtr& ev, const TActorContext& ctx);
 
-    void Handle(TEvPQProxy::TEvSessionSetPreferredCluster::TPtr& ev, const TActorContext& ctx);
+    void Handle(TEvPQProxy::TEvSessionSetPreferredCluster::TPtr& ev, const TActorContext& ctx); 
     void Handle(TEvPQProxy::TEvSessionDead::TPtr& ev, const TActorContext& ctx);
 
     NActors::TActorId SchemeCache;
@@ -65,11 +65,11 @@ private:
     TAtomic LastCookie = 0;
 
     THashMap<ui64, TActorId> Sessions;
-    // Created at by session cookie map by remote preferred cluster name
-    THashMap<TString, THashMap<ui64, TInstant>> SessionsByRemotePreferredCluster;
-    THashMap<ui64, TString> RemotePreferredClusterBySessionCookie;
-    // Cluster enabled at time if cluster is currently enabled
-    THashMap<TString, TInstant> ClustersEnabledAt;
+    // Created at by session cookie map by remote preferred cluster name 
+    THashMap<TString, THashMap<ui64, TInstant>> SessionsByRemotePreferredCluster; 
+    THashMap<ui64, TString> RemotePreferredClusterBySessionCookie; 
+    // Cluster enabled at time if cluster is currently enabled 
+    THashMap<TString, TInstant> ClustersEnabledAt; 
 
     TIntrusivePtr<NMonitoring::TDynamicCounters> Counters;
 
diff --git a/ydb/services/persqueue_v1/grpc_pq_write_actor.cpp b/ydb/services/persqueue_v1/grpc_pq_write_actor.cpp
index 3038cc82a6..a706a1cdd5 100644
--- a/ydb/services/persqueue_v1/grpc_pq_write_actor.cpp
+++ b/ydb/services/persqueue_v1/grpc_pq_write_actor.cpp
@@ -14,7 +14,7 @@
 #include <util/string/hex.h>
 #include <util/string/vector.h>
 #include <util/string/escape.h>
-#include <util/string/printf.h>
+#include <util/string/printf.h> 
 
 using namespace NActors;
 using namespace NKikimrClient;
@@ -76,7 +76,7 @@ void FillChunkDataFromReq(
 namespace NGRpcProxy {
 namespace V1 {
 
-using namespace Ydb::PersQueue::V1;
+using namespace Ydb::PersQueue::V1; 
 
 static const ui32 MAX_RESERVE_REQUESTS_INFLIGHT = 5;
 
@@ -131,11 +131,11 @@ TWriteSessionActor::TWriteSessionActor(
     , NextRequestInited(false)
     , NextRequestCookie(0)
     , Token(nullptr)
-    , UpdateTokenInProgress(false)
-    , UpdateTokenAuthenticated(false)
+    , UpdateTokenInProgress(false) 
+    , UpdateTokenAuthenticated(false) 
     , ACLCheckInProgress(false)
     , FirstACLCheck(true)
-    , RequestNotChecked(false)
+    , RequestNotChecked(false) 
     , LastACLCheckTimestamp(TInstant::Zero())
     , LogSessionDeadline(TInstant::Zero())
     , BalancerTabletId(0)
@@ -191,27 +191,27 @@ TString WriteRequestToLog(const Ydb::PersQueue::V1::StreamingWriteClientMessage&
 
 void TWriteSessionActor::Handle(IContext::TEvReadFinished::TPtr& ev, const TActorContext& ctx) {
     LOG_DEBUG_S(ctx, NKikimrServices::PQ_WRITE_PROXY, "session v1 cookie: " << Cookie << " sessionId: " << OwnerCookie << " grpc read done: success: " << ev->Get()->Success << " data: " << WriteRequestToLog(ev->Get()->Record));
-    if (!ev->Get()->Success) {
-        LOG_INFO_S(ctx, NKikimrServices::PQ_WRITE_PROXY, "session v1 cookie: " << Cookie << " sessionId: " << OwnerCookie << " grpc read failed");
-        ctx.Send(ctx.SelfID, new TEvPQProxy::TEvDone());
-        return;
-    }
-
-    switch(ev->Get()->Record.client_message_case()) {
-        case StreamingWriteClientMessage::kInitRequest:
+    if (!ev->Get()->Success) { 
+        LOG_INFO_S(ctx, NKikimrServices::PQ_WRITE_PROXY, "session v1 cookie: " << Cookie << " sessionId: " << OwnerCookie << " grpc read failed"); 
+        ctx.Send(ctx.SelfID, new TEvPQProxy::TEvDone()); 
+        return; 
+    } 
+
+    switch(ev->Get()->Record.client_message_case()) { 
+        case StreamingWriteClientMessage::kInitRequest: 
             ctx.Send(ctx.SelfID, new TEvPQProxy::TEvWriteInit(std::move(ev->Get()->Record), Request->GetStreamCtx()->GetPeerName()));
             break;
-        case StreamingWriteClientMessage::kWriteRequest:
+        case StreamingWriteClientMessage::kWriteRequest: 
             ctx.Send(ctx.SelfID, new TEvPQProxy::TEvWrite(std::move(ev->Get()->Record)));
             break;
-        case StreamingWriteClientMessage::kUpdateTokenRequest: {
-            ctx.Send(ctx.SelfID, new TEvPQProxy::TEvUpdateToken(std::move(ev->Get()->Record)));
-            break;
-        }
-        case StreamingWriteClientMessage::CLIENT_MESSAGE_NOT_SET: {
-            CloseSession("'client_message' is not set", PersQueue::ErrorCode::BAD_REQUEST, ctx);
-            return;
-        }
+        case StreamingWriteClientMessage::kUpdateTokenRequest: { 
+            ctx.Send(ctx.SelfID, new TEvPQProxy::TEvUpdateToken(std::move(ev->Get()->Record))); 
+            break; 
+        } 
+        case StreamingWriteClientMessage::CLIENT_MESSAGE_NOT_SET: { 
+            CloseSession("'client_message' is not set", PersQueue::ErrorCode::BAD_REQUEST, ctx); 
+            return; 
+        } 
     }
 }
 
@@ -261,7 +261,7 @@ void TWriteSessionActor::Handle(TEvPQProxy::TEvDone::TPtr&, const TActorContext&
 
 void TWriteSessionActor::CheckACL(const TActorContext& ctx) {
     //Y_VERIFY(ACLCheckInProgress);
-
+ 
     NACLib::EAccessRights rights = NACLib::EAccessRights::UpdateRow;
 
     Y_VERIFY(ACL);
@@ -271,16 +271,16 @@ void TWriteSessionActor::CheckACL(const TActorContext& ctx) {
             FirstACLCheck = false;
             DiscoverPartition(ctx);
         }
-        if (UpdateTokenInProgress && UpdateTokenAuthenticated) {
-            UpdateTokenInProgress = false;
-            StreamingWriteServerMessage serverMessage;
-            serverMessage.set_status(Ydb::StatusIds::SUCCESS);
-            serverMessage.mutable_update_token_response();
-            if (!Request->GetStreamCtx()->Write(std::move(serverMessage))) {
-                LOG_INFO_S(ctx, NKikimrServices::PQ_WRITE_PROXY, "session v1 cookie: " << Cookie << " sessionId: " << OwnerCookie << " grpc write failed");
-                Die(ctx);
-            }
-        }
+        if (UpdateTokenInProgress && UpdateTokenAuthenticated) { 
+            UpdateTokenInProgress = false; 
+            StreamingWriteServerMessage serverMessage; 
+            serverMessage.set_status(Ydb::StatusIds::SUCCESS); 
+            serverMessage.mutable_update_token_response(); 
+            if (!Request->GetStreamCtx()->Write(std::move(serverMessage))) { 
+                LOG_INFO_S(ctx, NKikimrServices::PQ_WRITE_PROXY, "session v1 cookie: " << Cookie << " sessionId: " << OwnerCookie << " grpc write failed"); 
+                Die(ctx); 
+            } 
+        } 
     } else {
         TString errorReason = Sprintf("access to topic '%s' denied for '%s' due to 'no WriteTopic rights', Marker# PQ1125",
             TopicConverter->GetClientsideName().c_str(),
@@ -297,10 +297,10 @@ void TWriteSessionActor::Handle(TEvPQProxy::TEvWriteInit::TPtr& ev, const TActor
         CloseSession("got second init request",  PersQueue::ErrorCode::BAD_REQUEST, ctx);
         return;
     }
-    const auto& init = event->Request.init_request();
+    const auto& init = event->Request.init_request(); 
 
-    if (init.topic().empty() || init.message_group_id().empty()) {
-        CloseSession("no topic or message_group_id in init request",  PersQueue::ErrorCode::BAD_REQUEST, ctx);
+    if (init.topic().empty() || init.message_group_id().empty()) { 
+        CloseSession("no topic or message_group_id in init request",  PersQueue::ErrorCode::BAD_REQUEST, ctx); 
         return;
     }
 
@@ -315,7 +315,7 @@ void TWriteSessionActor::Handle(TEvPQProxy::TEvWriteInit::TPtr& ev, const TActor
 
     PeerName = event->PeerName;
 
-    SourceId = init.message_group_id();
+    SourceId = init.message_group_id(); 
     TString encodedSourceId;
     try {
         encodedSourceId = NPQ::NSourceIdEncoding::Encode(SourceId);
@@ -343,7 +343,7 @@ void TWriteSessionActor::Handle(TEvPQProxy::TEvWriteInit::TPtr& ev, const TActor
 
     InitCheckSchema(ctx, true);
 
-    PreferedPartition = init.partition_group_id() > 0 ? init.partition_group_id() - 1 : Max<ui32>();
+    PreferedPartition = init.partition_group_id() > 0 ? init.partition_group_id() - 1 : Max<ui32>(); 
 
     InitMeta = GetInitialDataChunk(init, TopicConverter->GetFullLegacyName(), PeerName); // ToDo[migration] - check?
 
@@ -353,11 +353,11 @@ void TWriteSessionActor::Handle(TEvPQProxy::TEvWriteInit::TPtr& ev, const TActor
     SLITotal = NKikimr::NPQ::TMultiCounter(subGroup, Aggr, {}, {"RequestsTotal"}, true, "sensor", false);
     SLIErrors = NKikimr::NPQ::TMultiCounter(subGroup, Aggr, {}, {"RequestsError"}, true, "sensor", false);
     SLITotal.Inc();
-
-    const auto& preferredCluster = init.preferred_cluster();
-    if (!preferredCluster.empty()) {
-        Send(GetPQWriteServiceActorID(), new TEvPQProxy::TEvSessionSetPreferredCluster(Cookie, preferredCluster));
-    }
+ 
+    const auto& preferredCluster = init.preferred_cluster(); 
+    if (!preferredCluster.empty()) { 
+        Send(GetPQWriteServiceActorID(), new TEvPQProxy::TEvSessionSetPreferredCluster(Cookie, preferredCluster)); 
+    } 
 }
 
 void TWriteSessionActor::SetupCounters()
@@ -442,8 +442,8 @@ void TWriteSessionActor::Handle(TEvDescribeTopicsResponse::TPtr& ev, const TActo
 
     if (Request->GetInternalToken().empty()) { // session without auth
         if (AppData(ctx)->PQConfig.GetRequireCredentialsInNewProtocol()) {
-            Request->ReplyUnauthenticated("Unauthenticated access is forbidden, please provide credentials");
-            Die(ctx);
+            Request->ReplyUnauthenticated("Unauthenticated access is forbidden, please provide credentials"); 
+            Die(ctx); 
             return;
         }
         Y_VERIFY(FirstACLCheck);
@@ -580,7 +580,7 @@ void TWriteSessionActor::Handle(NKqp::TEvKqp::TEvQueryResponse::TPtr &ev, const
     auto& record = ev->Get()->Record.GetRef();
 
     if (record.GetYdbStatus() == Ydb::StatusIds::ABORTED) {
-        LOG_INFO_S(ctx, NKikimrServices::PQ_WRITE_PROXY, "session v1 cookie: " << Cookie << " sessionId: " << OwnerCookie << " messageGroupId "
+        LOG_INFO_S(ctx, NKikimrServices::PQ_WRITE_PROXY, "session v1 cookie: " << Cookie << " sessionId: " << OwnerCookie << " messageGroupId " 
             << SourceId << " escaped " << EscapedSourceId << " discover partition race, retrying");
         DiscoverPartition(ctx);
         return;
@@ -609,7 +609,7 @@ void TWriteSessionActor::Handle(NKqp::TEvKqp::TEvQueryResponse::TPtr &ev, const
             if (tt.HasOptional() && tt.GetOptional().HasUint32()) { //already got partition
                 Partition = tt.GetOptional().GetUint32();
                 if (PreferedPartition < Max<ui32>() && Partition != PreferedPartition) {
-                    CloseSession(TStringBuilder() << "MessageGroupId " << SourceId << " is already bound to PartitionGroupId " << (Partition + 1) << ", but client provided " << (PreferedPartition + 1) << ". MessageGroupId->PartitionGroupId binding cannot be changed, either use another MessageGroupId, specify PartitionGroupId " << (Partition + 1) << ", or do not specify PartitionGroupId at all.",
+                    CloseSession(TStringBuilder() << "MessageGroupId " << SourceId << " is already bound to PartitionGroupId " << (Partition + 1) << ", but client provided " << (PreferedPartition + 1) << ". MessageGroupId->PartitionGroupId binding cannot be changed, either use another MessageGroupId, specify PartitionGroupId " << (Partition + 1) << ", or do not specify PartitionGroupId at all.", 
                         PersQueue::ErrorCode::BAD_REQUEST, ctx);
                     return;
                 }
@@ -618,7 +618,7 @@ void TWriteSessionActor::Handle(NKqp::TEvKqp::TEvQueryResponse::TPtr &ev, const
             }
         }
 
-        LOG_INFO_S(ctx, NKikimrServices::PQ_WRITE_PROXY, "session v1 cookie: " << Cookie << " sessionId: " << OwnerCookie << " messageGroupId "
+        LOG_INFO_S(ctx, NKikimrServices::PQ_WRITE_PROXY, "session v1 cookie: " << Cookie << " sessionId: " << OwnerCookie << " messageGroupId " 
             << SourceId << " escaped " << EscapedSourceId << " hash " << Hash << " partition " << Partition << " partitions "
             << PartitionToTablet.size() << "(" << Hash % PartitionToTablet.size() << ") create " << SourceIdCreateTime << " result " << t);
 
@@ -728,7 +728,7 @@ void TWriteSessionActor::CloseSession(const TString& errorReason, const PersQueu
             ++(*GetServiceCounters(Counters, "pqproxy|writeSession")->GetCounter("Errors", true));
         }
 
-        StreamingWriteServerMessage result;
+        StreamingWriteServerMessage result; 
         result.set_status(ConvertPersQueueInternalCodeToStatus(errorCode));
         FillIssue(result.add_issues(), errorCode, errorReason);
 
@@ -879,7 +879,7 @@ void TWriteSessionActor::Handle(NPQ::TEvPartitionWriter::TEvWriteResponse::TPtr&
         stat->set_persist_duration_ms(
             Max((i64)res.GetWriteTimeMs(), stat->persist_duration_ms()));
     };
-
+ 
     ui32 partitionCmdWriteResultIndex = 0;
     // TODO: Send single batch write response for all user write requests up to some max size/count
     for (const auto& userWriteRequest : writeRequest->UserWriteRequests) {
@@ -887,7 +887,7 @@ void TWriteSessionActor::Handle(NPQ::TEvPartitionWriter::TEvWriteResponse::TPtr&
         result.set_status(Ydb::StatusIds::SUCCESS);
         auto batchWriteResponse = result.mutable_batch_write_response();
         batchWriteResponse->set_partition_id(Partition);
-
+ 
         for (size_t messageIndex = 0, endIndex = userWriteRequest->Request.write_request().sequence_numbers_size(); messageIndex != endIndex; ++messageIndex) {
             if (partitionCmdWriteResultIndex == resp.CmdWriteResultSize()) {
                 CloseSession("too less responses from server", PersQueue::ErrorCode::ERROR, ctx);
@@ -948,21 +948,21 @@ void TWriteSessionActor::GenerateNextWriteRequest(const TActorContext& ctx) {
     Writes.clear();
 
     i64 diff = 0;
-    auto addData = [&](const StreamingWriteClientMessage::WriteRequest& writeRequest, const i32 messageIndex) {
+    auto addData = [&](const StreamingWriteClientMessage::WriteRequest& writeRequest, const i32 messageIndex) { 
         auto w = request.MutablePartitionRequest()->AddCmdWrite();
         w->SetData(GetSerializedData(InitMeta, writeRequest, messageIndex));
-        w->SetSeqNo(writeRequest.sequence_numbers(messageIndex));
+        w->SetSeqNo(writeRequest.sequence_numbers(messageIndex)); 
         w->SetSourceId(NPQ::NSourceIdEncoding::EncodeSimple(SourceId));
-        w->SetCreateTimeMS(writeRequest.created_at_ms(messageIndex));
+        w->SetCreateTimeMS(writeRequest.created_at_ms(messageIndex)); 
         w->SetUncompressedSize(writeRequest.blocks_uncompressed_sizes(messageIndex));
         w->SetClientDC(ClientDC);
     };
 
     for (const auto& write : writeRequest->UserWriteRequests) {
         diff -= write->Request.ByteSize();
-        const auto& writeRequest = write->Request.write_request();
-        for (i32 messageIndex = 0; messageIndex != writeRequest.sequence_numbers_size(); ++messageIndex) {
-            addData(writeRequest, messageIndex);
+        const auto& writeRequest = write->Request.write_request(); 
+        for (i32 messageIndex = 0; messageIndex != writeRequest.sequence_numbers_size(); ++messageIndex) { 
+            addData(writeRequest, messageIndex); 
         }
     }
 
@@ -982,48 +982,48 @@ void TWriteSessionActor::GenerateNextWriteRequest(const TActorContext& ctx) {
     ++NumReserveBytesRequests;
 }
 
-void TWriteSessionActor::Handle(TEvPQProxy::TEvUpdateToken::TPtr& ev, const TActorContext& ctx) {
-    if (State != ES_INITED) {
-        CloseSession("got 'update_token_request' but write session is not initialized", PersQueue::ErrorCode::BAD_REQUEST, ctx);
-        return;
-    }
-    if (UpdateTokenInProgress) {
-        CloseSession("got another 'update_token_request' while previous still in progress, only single token update is allowed at a time", PersQueue::ErrorCode::OVERLOAD, ctx);
-        return;
-    }
-
-    const auto& token = ev->Get()->Request.update_token_request().token();
-    if (token == Auth || (token.empty() && !AppData(ctx)->PQConfig.GetRequireCredentialsInNewProtocol())) {
-        // Got same token or empty token with no non-empty token requirement, do not trigger any checks
-        StreamingWriteServerMessage serverMessage;
-        serverMessage.set_status(Ydb::StatusIds::SUCCESS);
-        serverMessage.mutable_update_token_response();
-        if (!Request->GetStreamCtx()->Write(std::move(serverMessage))) {
-            LOG_INFO_S(ctx, NKikimrServices::PQ_WRITE_PROXY, "session v1 cookie: " << Cookie << " sessionId: " << OwnerCookie << " grpc write failed");
-            Die(ctx);
-            return;
-        }
-    }
-    else if (token.empty()) {
-        Request->ReplyUnauthenticated("'token' in 'update_token_request' is empty");
-        Die(ctx);
-        return;
-    }
-    else {
-        UpdateTokenInProgress = true;
-        UpdateTokenAuthenticated = false;
-        Auth = token;
-        Request->RefreshToken(Auth, ctx, ctx.SelfID);
-    }
-
-    NextRequestInited = true;
-    if (!Request->GetStreamCtx()->Read()) {
-        LOG_INFO_S(ctx, NKikimrServices::PQ_WRITE_PROXY, "session v1 cookie: " << Cookie << " sessionId: " << OwnerCookie << " grpc read failed");
-        Die(ctx);
-        return;
-    }
-}
-
+void TWriteSessionActor::Handle(TEvPQProxy::TEvUpdateToken::TPtr& ev, const TActorContext& ctx) { 
+    if (State != ES_INITED) { 
+        CloseSession("got 'update_token_request' but write session is not initialized", PersQueue::ErrorCode::BAD_REQUEST, ctx); 
+        return; 
+    } 
+    if (UpdateTokenInProgress) { 
+        CloseSession("got another 'update_token_request' while previous still in progress, only single token update is allowed at a time", PersQueue::ErrorCode::OVERLOAD, ctx); 
+        return; 
+    } 
+ 
+    const auto& token = ev->Get()->Request.update_token_request().token(); 
+    if (token == Auth || (token.empty() && !AppData(ctx)->PQConfig.GetRequireCredentialsInNewProtocol())) { 
+        // Got same token or empty token with no non-empty token requirement, do not trigger any checks 
+        StreamingWriteServerMessage serverMessage; 
+        serverMessage.set_status(Ydb::StatusIds::SUCCESS); 
+        serverMessage.mutable_update_token_response(); 
+        if (!Request->GetStreamCtx()->Write(std::move(serverMessage))) { 
+            LOG_INFO_S(ctx, NKikimrServices::PQ_WRITE_PROXY, "session v1 cookie: " << Cookie << " sessionId: " << OwnerCookie << " grpc write failed"); 
+            Die(ctx); 
+            return; 
+        } 
+    } 
+    else if (token.empty()) { 
+        Request->ReplyUnauthenticated("'token' in 'update_token_request' is empty"); 
+        Die(ctx); 
+        return; 
+    } 
+    else { 
+        UpdateTokenInProgress = true; 
+        UpdateTokenAuthenticated = false; 
+        Auth = token; 
+        Request->RefreshToken(Auth, ctx, ctx.SelfID); 
+    } 
+ 
+    NextRequestInited = true; 
+    if (!Request->GetStreamCtx()->Read()) { 
+        LOG_INFO_S(ctx, NKikimrServices::PQ_WRITE_PROXY, "session v1 cookie: " << Cookie << " sessionId: " << OwnerCookie << " grpc read failed"); 
+        Die(ctx); 
+        return; 
+    } 
+} 
+ 
 void TWriteSessionActor::Handle(NGRpcService::TGRpcRequestProxy::TEvRefreshTokenResponse::TPtr &ev , const TActorContext& ctx) {
     Y_UNUSED(ctx);
     LOG_INFO_S(ctx, NKikimrServices::PQ_WRITE_PROXY, "updating token");
@@ -1031,10 +1031,10 @@ void TWriteSessionActor::Handle(NGRpcService::TGRpcRequestProxy::TEvRefreshToken
     if (ev->Get()->Authenticated && !ev->Get()->InternalToken.empty()) {
         Token = new NACLib::TUserToken(ev->Get()->InternalToken);
         Request->SetInternalToken(ev->Get()->InternalToken);
-        UpdateTokenAuthenticated = true;
-        if (!ACLCheckInProgress) {
+        UpdateTokenAuthenticated = true; 
+        if (!ACLCheckInProgress) { 
             InitCheckSchema(ctx);
-        }
+        } 
     } else {
         Request->ReplyUnauthenticated("refreshed token is invalid");
         Die(ctx);
@@ -1051,65 +1051,65 @@ void TWriteSessionActor::Handle(TEvPQProxy::TEvWrite::TPtr& ev, const TActorCont
         return;
     }
 
-    const auto& writeRequest = ev->Get()->Request.write_request();
-    if (!AllEqual(writeRequest.sequence_numbers_size(), writeRequest.created_at_ms_size(), writeRequest.sent_at_ms_size(), writeRequest.message_sizes_size())) {
-        CloseSession(TStringBuilder() << "messages meta repeated fields do not have same size, 'sequence_numbers' size is " << writeRequest.sequence_numbers_size()
-            << ", 'message_sizes' size is " << writeRequest.message_sizes_size() << ", 'created_at_ms' size is " << writeRequest.created_at_ms_size()
-            << " and 'sent_at_ms' size is " << writeRequest.sent_at_ms_size(), PersQueue::ErrorCode::BAD_REQUEST, ctx);
-        return;
-    }
-    if (!AllEqual(writeRequest.blocks_offsets_size(), writeRequest.blocks_part_numbers_size(), writeRequest.blocks_message_counts_size(), writeRequest.blocks_uncompressed_sizes_size(), writeRequest.blocks_headers_size(), writeRequest.blocks_data_size())) {
-        CloseSession(TStringBuilder() << "blocks repeated fields do no have same size, 'blocks_offsets' size is " << writeRequest.blocks_offsets_size()
-            << ", 'blocks_part_numbers' size is " << writeRequest.blocks_part_numbers_size() << ", 'blocks_message_counts' size is " << writeRequest.blocks_message_counts_size()
-            << ", 'blocks_uncompressed_sizes' size is " << writeRequest.blocks_uncompressed_sizes_size() << ", 'blocks_headers' size is " << writeRequest.blocks_headers_size()
-            << " and 'blocks_data' size is " << writeRequest.blocks_data_size(), PersQueue::ErrorCode::BAD_REQUEST, ctx);
-        return;
-    }
-
-    const i32 messageCount = writeRequest.sequence_numbers_size();
-    const i32 blockCount = writeRequest.blocks_offsets_size();
-    if (messageCount == 0) {
-        CloseSession(TStringBuilder() << "messages meta repeated fields are empty, write request contains no messages", PersQueue::ErrorCode::BAD_REQUEST, ctx);
-        return;
-    }
-    if (messageCount != blockCount) {
-        CloseSession(TStringBuilder() << "messages meta repeated fields and blocks repeated fields do not have same size, messages meta fields size is " << messageCount
-            << " and blocks fields size is " << blockCount << ", only one message per block is supported in blocks format version 0", PersQueue::ErrorCode::BAD_REQUEST, ctx);
-        return;
-    }
-    auto dataCheck = [&](const StreamingWriteClientMessage::WriteRequest& data, const i32 messageIndex) -> bool {
-        if (data.sequence_numbers(messageIndex) <= 0) {
-            CloseSession(TStringBuilder() << "bad write request - 'sequence_numbers' items must be greater than 0. Value at position " << messageIndex << " is " << data.sequence_numbers(messageIndex), PersQueue::ErrorCode::BAD_REQUEST, ctx);
+    const auto& writeRequest = ev->Get()->Request.write_request(); 
+    if (!AllEqual(writeRequest.sequence_numbers_size(), writeRequest.created_at_ms_size(), writeRequest.sent_at_ms_size(), writeRequest.message_sizes_size())) { 
+        CloseSession(TStringBuilder() << "messages meta repeated fields do not have same size, 'sequence_numbers' size is " << writeRequest.sequence_numbers_size() 
+            << ", 'message_sizes' size is " << writeRequest.message_sizes_size() << ", 'created_at_ms' size is " << writeRequest.created_at_ms_size() 
+            << " and 'sent_at_ms' size is " << writeRequest.sent_at_ms_size(), PersQueue::ErrorCode::BAD_REQUEST, ctx); 
+        return; 
+    } 
+    if (!AllEqual(writeRequest.blocks_offsets_size(), writeRequest.blocks_part_numbers_size(), writeRequest.blocks_message_counts_size(), writeRequest.blocks_uncompressed_sizes_size(), writeRequest.blocks_headers_size(), writeRequest.blocks_data_size())) { 
+        CloseSession(TStringBuilder() << "blocks repeated fields do no have same size, 'blocks_offsets' size is " << writeRequest.blocks_offsets_size() 
+            << ", 'blocks_part_numbers' size is " << writeRequest.blocks_part_numbers_size() << ", 'blocks_message_counts' size is " << writeRequest.blocks_message_counts_size() 
+            << ", 'blocks_uncompressed_sizes' size is " << writeRequest.blocks_uncompressed_sizes_size() << ", 'blocks_headers' size is " << writeRequest.blocks_headers_size() 
+            << " and 'blocks_data' size is " << writeRequest.blocks_data_size(), PersQueue::ErrorCode::BAD_REQUEST, ctx); 
+        return; 
+    } 
+ 
+    const i32 messageCount = writeRequest.sequence_numbers_size(); 
+    const i32 blockCount = writeRequest.blocks_offsets_size(); 
+    if (messageCount == 0) { 
+        CloseSession(TStringBuilder() << "messages meta repeated fields are empty, write request contains no messages", PersQueue::ErrorCode::BAD_REQUEST, ctx); 
+        return; 
+    } 
+    if (messageCount != blockCount) { 
+        CloseSession(TStringBuilder() << "messages meta repeated fields and blocks repeated fields do not have same size, messages meta fields size is " << messageCount 
+            << " and blocks fields size is " << blockCount << ", only one message per block is supported in blocks format version 0", PersQueue::ErrorCode::BAD_REQUEST, ctx); 
+        return; 
+    } 
+    auto dataCheck = [&](const StreamingWriteClientMessage::WriteRequest& data, const i32 messageIndex) -> bool { 
+        if (data.sequence_numbers(messageIndex) <= 0) { 
+            CloseSession(TStringBuilder() << "bad write request - 'sequence_numbers' items must be greater than 0. Value at position " << messageIndex << " is " << data.sequence_numbers(messageIndex), PersQueue::ErrorCode::BAD_REQUEST, ctx); 
             return false;
         }
 
-        if (messageIndex > 0 && data.sequence_numbers(messageIndex) <= data.sequence_numbers(messageIndex - 1)) {
-            CloseSession(TStringBuilder() << "bad write request - 'sequence_numbers' are unsorted. Value " << data.sequence_numbers(messageIndex) << " at position " << messageIndex
-                << " is less than or equal to value " << data.sequence_numbers(messageIndex - 1) << " at position " << (messageIndex - 1), PersQueue::ErrorCode::BAD_REQUEST, ctx);
+        if (messageIndex > 0 && data.sequence_numbers(messageIndex) <= data.sequence_numbers(messageIndex - 1)) { 
+            CloseSession(TStringBuilder() << "bad write request - 'sequence_numbers' are unsorted. Value " << data.sequence_numbers(messageIndex) << " at position " << messageIndex 
+                << " is less than or equal to value " << data.sequence_numbers(messageIndex - 1) << " at position " << (messageIndex - 1), PersQueue::ErrorCode::BAD_REQUEST, ctx); 
             return false;
         }
-
-        if (data.blocks_headers(messageIndex).size() != CODEC_ID_SIZE) {
-            CloseSession(TStringBuilder() << "bad write request - 'blocks_headers' at position " << messageIndex <<  " has incorrect size " << data.blocks_headers(messageIndex).size() << " [B]. Only headers of size " << CODEC_ID_SIZE << " [B] (with codec identifier) are supported in block format version 0", PersQueue::ErrorCode::BAD_REQUEST, ctx);
-            return false;
-        }
-
-        const char& codecID = data.blocks_headers(messageIndex).front();
-        TString error;
-        if (!ValidateWriteWithCodec(InitialPQTabletConfig, codecID, error)) {
-            CloseSession(TStringBuilder() << "bad write request - 'blocks_headers' at position " << messageIndex << " is invalid: " << error, PersQueue::ErrorCode::BAD_REQUEST, ctx);
-            return false;
-        }
-
-        if (data.blocks_message_counts(messageIndex) != 1) {
-            CloseSession(TStringBuilder() << "bad write request - 'blocks_message_counts' at position " << messageIndex << " is " << data.blocks_message_counts(messageIndex)
-                << ", only single message per block is supported by block format version 0", PersQueue::ErrorCode::BAD_REQUEST, ctx);
-            return false;
+ 
+        if (data.blocks_headers(messageIndex).size() != CODEC_ID_SIZE) { 
+            CloseSession(TStringBuilder() << "bad write request - 'blocks_headers' at position " << messageIndex <<  " has incorrect size " << data.blocks_headers(messageIndex).size() << " [B]. Only headers of size " << CODEC_ID_SIZE << " [B] (with codec identifier) are supported in block format version 0", PersQueue::ErrorCode::BAD_REQUEST, ctx); 
+            return false; 
+        } 
+ 
+        const char& codecID = data.blocks_headers(messageIndex).front(); 
+        TString error; 
+        if (!ValidateWriteWithCodec(InitialPQTabletConfig, codecID, error)) { 
+            CloseSession(TStringBuilder() << "bad write request - 'blocks_headers' at position " << messageIndex << " is invalid: " << error, PersQueue::ErrorCode::BAD_REQUEST, ctx); 
+            return false; 
         }
+ 
+        if (data.blocks_message_counts(messageIndex) != 1) { 
+            CloseSession(TStringBuilder() << "bad write request - 'blocks_message_counts' at position " << messageIndex << " is " << data.blocks_message_counts(messageIndex) 
+                << ", only single message per block is supported by block format version 0", PersQueue::ErrorCode::BAD_REQUEST, ctx); 
+            return false; 
+        } 
         return true;
     };
-    for (i32 messageIndex = 0; messageIndex != messageCount; ++messageIndex) {
-        if (!dataCheck(writeRequest, messageIndex)) {
+    for (i32 messageIndex = 0; messageIndex != messageCount; ++messageIndex) { 
+        if (!dataCheck(writeRequest, messageIndex)) { 
             return;
         }
     }
@@ -1154,7 +1154,7 @@ void TWriteSessionActor::LogSession(const TActorContext& ctx) {
 void TWriteSessionActor::HandleWakeup(const TActorContext& ctx) {
     Y_VERIFY(State == ES_INITED);
     ctx.Schedule(CHECK_ACL_DELAY, new TEvents::TEvWakeup());
-    if (Token && !ACLCheckInProgress && RequestNotChecked && (ctx.Now() - LastACLCheckTimestamp > TDuration::Seconds(AppData(ctx)->PQConfig.GetACLRetryTimeoutSec()))) {
+    if (Token && !ACLCheckInProgress && RequestNotChecked && (ctx.Now() - LastACLCheckTimestamp > TDuration::Seconds(AppData(ctx)->PQConfig.GetACLRetryTimeoutSec()))) { 
         RequestNotChecked = false;
         InitCheckSchema(ctx);
     }
diff --git a/ydb/services/persqueue_v1/persqueue.cpp b/ydb/services/persqueue_v1/persqueue.cpp
index ccacc4d43a..8572a6c02f 100644
--- a/ydb/services/persqueue_v1/persqueue.cpp
+++ b/ydb/services/persqueue_v1/persqueue.cpp
@@ -71,9 +71,9 @@ void TGRpcPersQueueService::SetupIncomingRequests(NGrpc::TLoggerPtr logger) {
     auto getCounterBlock = NKikimr::NGRpcService::CreateCounterCb(Counters, ActorSystem);
 
     {
-        using TBiRequest = Ydb::PersQueue::V1::StreamingWriteClientMessage;
+        using TBiRequest = Ydb::PersQueue::V1::StreamingWriteClientMessage; 
 
-        using TBiResponse = Ydb::PersQueue::V1::StreamingWriteServerMessage;
+        using TBiResponse = Ydb::PersQueue::V1::StreamingWriteServerMessage; 
 
         using TStreamGRpcRequest = NGRpcServer::TGRpcStreamingRequest<
                     TBiRequest,
@@ -82,7 +82,7 @@ void TGRpcPersQueueService::SetupIncomingRequests(NGrpc::TLoggerPtr logger) {
                     NKikimrServices::GRPC_SERVER>;
 
 
-        TStreamGRpcRequest::Start(this, this->GetService(), CQ, &Ydb::PersQueue::V1::PersQueueService::AsyncService::RequestStreamingWrite,
+        TStreamGRpcRequest::Start(this, this->GetService(), CQ, &Ydb::PersQueue::V1::PersQueueService::AsyncService::RequestStreamingWrite, 
                     [this](TIntrusivePtr<TStreamGRpcRequest::IContext> context) {
                         ActorSystem->Send(GRpcRequestProxy, new NKikimr::NGRpcService::TEvStreamPQWriteRequest(context));
                     },
@@ -114,7 +114,7 @@ void TGRpcPersQueueService::SetupIncomingRequests(NGrpc::TLoggerPtr logger) {
 #error ADD_REQUEST macro already defined
 #endif
 #define ADD_REQUEST(NAME, SVC, IN, OUT, ACTION) \
-    MakeIntrusive<TGRpcRequest<Ydb::PersQueue::V1::IN, Ydb::PersQueue::V1::OUT, NGRpcService::V1::TGRpcPersQueueService>>(this, this->GetService(), CQ, \
+    MakeIntrusive<TGRpcRequest<Ydb::PersQueue::V1::IN, Ydb::PersQueue::V1::OUT, NGRpcService::V1::TGRpcPersQueueService>>(this, this->GetService(), CQ, \ 
         [this](NGrpc::IRequestContextBase *ctx) { \
             NGRpcService::ReportGrpcReqToMon(*ActorSystem, ctx->GetPeer()); \
             ACTION; \
diff --git a/ydb/services/persqueue_v1/persqueue_ut.cpp b/ydb/services/persqueue_v1/persqueue_ut.cpp
index 3bc9b21728..11f7ade7cc 100644
--- a/ydb/services/persqueue_v1/persqueue_ut.cpp
+++ b/ydb/services/persqueue_v1/persqueue_ut.cpp
@@ -1,10 +1,10 @@
-#include "grpc_pq_actor.h"
+#include "grpc_pq_actor.h" 
 #include <ydb/services/persqueue_v1/ut/pq_data_writer.h>
 #include <ydb/services/persqueue_v1/ut/api_test_setup.h>
 #include <ydb/services/persqueue_v1/ut/rate_limiter_test_setup.h>
 #include <ydb/services/persqueue_v1/ut/test_utils.h>
 #include <ydb/services/persqueue_v1/ut/persqueue_test_fixture.h>
-
+ 
 #include <ydb/core/base/appdata.h>
 #include <ydb/core/testlib/test_pq_client.h>
 #include <ydb/core/protos/grpc_pq_old.pb.h>
@@ -43,7 +43,7 @@ namespace NKikimr::NPersQueueTests {
 using namespace Tests;
 using namespace NKikimrClient;
 using namespace Ydb::PersQueue;
-using namespace Ydb::PersQueue::V1;
+using namespace Ydb::PersQueue::V1; 
 using namespace NThreading;
 using namespace NNetClassifier;
 
@@ -99,22 +99,22 @@ namespace {
 
 
     Y_UNIT_TEST_SUITE(TPersQueueTest) {
-    Y_UNIT_TEST(AllEqual) {
-        using NGRpcProxy::V1::AllEqual;
-
-        UNIT_ASSERT(AllEqual(0));
-        UNIT_ASSERT(AllEqual(0, 0));
-        UNIT_ASSERT(AllEqual(0, 0, 0));
-        UNIT_ASSERT(AllEqual(1, 1, 1));
-        UNIT_ASSERT(AllEqual(1, 1, 1, 1, 1, 1));
-        UNIT_ASSERT(!AllEqual(1, 0));
-        UNIT_ASSERT(!AllEqual(0, 1));
-        UNIT_ASSERT(!AllEqual(0, 1, 0));
-        UNIT_ASSERT(!AllEqual(1, 1, 0));
-        UNIT_ASSERT(!AllEqual(0, 1, 1));
-        UNIT_ASSERT(!AllEqual(1, 1, 1, 1, 1, 0));
-    }
-
+    Y_UNIT_TEST(AllEqual) { 
+        using NGRpcProxy::V1::AllEqual; 
+
+        UNIT_ASSERT(AllEqual(0)); 
+        UNIT_ASSERT(AllEqual(0, 0)); 
+        UNIT_ASSERT(AllEqual(0, 0, 0)); 
+        UNIT_ASSERT(AllEqual(1, 1, 1)); 
+        UNIT_ASSERT(AllEqual(1, 1, 1, 1, 1, 1)); 
+        UNIT_ASSERT(!AllEqual(1, 0)); 
+        UNIT_ASSERT(!AllEqual(0, 1)); 
+        UNIT_ASSERT(!AllEqual(0, 1, 0)); 
+        UNIT_ASSERT(!AllEqual(1, 1, 0)); 
+        UNIT_ASSERT(!AllEqual(0, 1, 1)); 
+        UNIT_ASSERT(!AllEqual(1, 1, 1, 1, 1, 0)); 
+    } 
+ 
     Y_UNIT_TEST(SetupLockSession2) {
         TPersQueueV1TestServer server;
         SET_LOCALS;
@@ -428,27 +428,27 @@ namespace {
         UNIT_ASSERT(!writer2->Close());
     }
 
-    Y_UNIT_TEST(EachMessageGetsExactlyOneAcknowledgementInCorrectOrder) {
+    Y_UNIT_TEST(EachMessageGetsExactlyOneAcknowledgementInCorrectOrder) { 
         NPersQueue::TTestServer server;
         server.AnnoyingClient->CreateTopic("rt3.dc1--topic", 1);
-
+ 
         auto driver = server.AnnoyingClient->GetDriver();
 
         auto writer = CreateSimpleWriter(*driver, "topic", "test source ID");
 
         bool res = true;
 
-        ui32 messageCount = 1000;
-
-        for (ui32 sequenceNumber = 1; sequenceNumber <= messageCount; ++sequenceNumber) {
+        ui32 messageCount = 1000; 
+ 
+        for (ui32 sequenceNumber = 1; sequenceNumber <= messageCount; ++sequenceNumber) { 
                 res = writer->Write("x", sequenceNumber);
                 UNIT_ASSERT(res);
-        }
+        } 
         UNIT_ASSERT(writer->IsAlive());
         res = writer->Close(TDuration::Seconds(10));
         UNIT_ASSERT(res);
-    }
-
+    } 
+ 
     Y_UNIT_TEST(SetupWriteSessionOnDisabledCluster) {
         TPersQueueV1TestServer server;
         SET_LOCALS;
@@ -1079,7 +1079,7 @@ namespace {
         NACLib::TDiffACL acl;
         acl.AddAccess(NACLib::EAccessType::Allow, NACLib::UpdateRow, "topic1@" BUILTIN_ACL_DOMAIN);
         server.AnnoyingClient->ModifyACL("/Root/PQ", DEFAULT_TOPIC_NAME, acl.SerializeAsString());
-        WaitACLModification();
+        WaitACLModification(); 
 
         writer2.Write(SHORT_TOPIC_NAME, {"valuevaluevalue1"}, false, "topic1@" BUILTIN_ACL_DOMAIN);
         writer2.Write(SHORT_TOPIC_NAME, {"valuevaluevalue1"}, true, "invalid_ticket");
@@ -1092,7 +1092,7 @@ namespace {
             dynamic_cast<TTestCredentialsProviderFactory*>(creds.get())->SetToken(NYdb::TStringType("topic1@" BUILTIN_ACL_DOMAIN));
 
             auto writer = CreateWriter(*driver, SHORT_TOPIC_NAME, "123", {}, {}, {}, creds);
-
+ 
             auto msg = writer->GetEvent(true);
             UNIT_ASSERT(msg); // ReadyToAcceptEvent
 
@@ -1166,7 +1166,7 @@ namespace {
         acl.AddAccess(NACLib::EAccessType::Allow, NACLib::SelectRow, "user1@" BUILTIN_ACL_DOMAIN);
         acl.AddAccess(NACLib::EAccessType::Allow, NACLib::SelectRow, "user2@" BUILTIN_ACL_DOMAIN);
         server.AnnoyingClient->ModifyACL("/Root/PQ", topic2, acl.SerializeAsString());
-        WaitACLModification();
+        WaitACLModification(); 
 
         auto ticket1 = "1@" BUILTIN_ACL_DOMAIN;
         auto ticket2 = "2@" BUILTIN_ACL_DOMAIN;
@@ -1186,7 +1186,7 @@ namespace {
         acl.Clear();
         acl.AddAccess(NACLib::EAccessType::Allow, NACLib::SelectRow, "user3@" BUILTIN_ACL_DOMAIN);
         server.AnnoyingClient->ModifyACL("/Root/PQ", topic2, acl.SerializeAsString());
-        WaitACLModification();
+        WaitACLModification(); 
 
         Cerr << "==== Writer - read\n";
         writer.Read(shortTopic2Name, "user1", "user3@" BUILTIN_ACL_DOMAIN, false, true, true);
@@ -1359,7 +1359,7 @@ namespace {
 
             if (i == 5) {
                 UNIT_ASSERT(TInstant::Now() - st > TDuration::Seconds(3));
-                // TODO: Describe this assert in comment
+                // TODO: Describe this assert in comment 
                 UNIT_ASSERT(!ack->Acks.empty());
                 UNIT_ASSERT(ack->Acks.back().Stat);
                 UNIT_ASSERT(ack->Acks.back().Stat->TotalTimeInPartitionQueue >= ack->Acks.back().Stat->PartitionQuotedTime);
@@ -1747,7 +1747,7 @@ namespace {
             for (ui32 i = 1; i <= 11; ++i) {
                 auto f = producer->Write(i,  TString(10, 'a'));
                 f.Wait();
-                UNIT_ASSERT_C(f.GetValue().Response.server_message_case() == StreamingWriteServerMessage::kBatchWriteResponse, f.GetValue().Response);
+                UNIT_ASSERT_C(f.GetValue().Response.server_message_case() == StreamingWriteServerMessage::kBatchWriteResponse, f.GetValue().Response); 
             }
         }
 
@@ -2129,227 +2129,227 @@ namespace {
         UNIT_ASSERT_EQUAL(ccResult.Response.Getissues(0).issue_code(), Ydb::PersQueue::ErrorCode::UNKNOWN_TOPIC);
     }
 */
-    Y_UNIT_TEST(Codecs_InitWriteSession_DefaultTopicSupportedCodecsInInitResponse) {
-        APITestSetup setup{TEST_CASE_NAME};
-        grpc::ClientContext context;
-        auto session = setup.GetPersQueueService()->StreamingWrite(&context);
-
-
-        auto serverMessage = setup.InitSession(session);
-
-
+    Y_UNIT_TEST(Codecs_InitWriteSession_DefaultTopicSupportedCodecsInInitResponse) { 
+        APITestSetup setup{TEST_CASE_NAME}; 
+        grpc::ClientContext context; 
+        auto session = setup.GetPersQueueService()->StreamingWrite(&context); 
+ 
+ 
+        auto serverMessage = setup.InitSession(session); 
+ 
+ 
         auto defaultSupportedCodecs = TVector<Ydb::PersQueue::V1::Codec>{ Ydb::PersQueue::V1::CODEC_RAW, Ydb::PersQueue::V1::CODEC_GZIP, Ydb::PersQueue::V1::CODEC_LZOP };
-        auto topicSupportedCodecs = serverMessage.init_response().supported_codecs();
+        auto topicSupportedCodecs = serverMessage.init_response().supported_codecs(); 
         UNIT_ASSERT_VALUES_EQUAL_C(defaultSupportedCodecs.size(), topicSupportedCodecs.size(), serverMessage.init_response());
         UNIT_ASSERT_C(Equal(defaultSupportedCodecs.begin(), defaultSupportedCodecs.end(), topicSupportedCodecs.begin()), serverMessage.init_response());
-    }
-
-    Y_UNIT_TEST(Codecs_WriteMessageWithDefaultCodecs_MessagesAreAcknowledged) {
-        APITestSetup setup{TEST_CASE_NAME};
-        auto log = setup.GetLog();
-        StreamingWriteClientMessage clientMessage;
-        auto* writeRequest = clientMessage.mutable_write_request();
-        auto sequenceNumber = 1;
-        auto messageCount = 0;
-        const auto message = NUnitTest::RandomString(250 * 1024, std::rand());
-        auto compress = [](TString data, i32 codecID) {
-            Y_UNUSED(codecID);
-            return TString(data);
-        };
-        TVector<char> defaultCodecs{0, 1, 2};
-        for (const auto& codecID : defaultCodecs) {
-            auto compressedMessage = compress(message, codecID);
-
-            writeRequest->add_sequence_numbers(sequenceNumber++);
-            writeRequest->add_message_sizes(message.size());
-            writeRequest->add_created_at_ms(TInstant::Now().MilliSeconds());
-            writeRequest->add_sent_at_ms(TInstant::Now().MilliSeconds());
-            writeRequest->add_blocks_offsets(0);
-            writeRequest->add_blocks_part_numbers(0);
-            writeRequest->add_blocks_message_counts(1);
-            writeRequest->add_blocks_uncompressed_sizes(message.size());
-            writeRequest->add_blocks_headers(TString(1, codecID));
-            writeRequest->add_blocks_data(compressedMessage);
-            ++messageCount;
-        }
-        auto session = setup.InitWriteSession();
-
-
-        AssertSuccessfullStreamingOperation(session.first->Write(clientMessage), session.first, &clientMessage);
-
-
-        StreamingWriteServerMessage serverMessage;
-        log << TLOG_INFO << "Wait for write acknowledgement";
-        AssertSuccessfullStreamingOperation(session.first->Read(&serverMessage), session.first);
-        UNIT_ASSERT_C(serverMessage.server_message_case() == StreamingWriteServerMessage::kBatchWriteResponse, serverMessage);
-        UNIT_ASSERT_VALUES_EQUAL_C(defaultCodecs.size(), serverMessage.batch_write_response().offsets_size(), serverMessage);
-    }
-
-    Y_UNIT_TEST(Codecs_WriteMessageWithNonDefaultCodecThatHasToBeConfiguredAdditionally_SessionClosedWithBadRequestError) {
-        APITestSetup setup{TEST_CASE_NAME};
-        auto log = setup.GetLog();
-        StreamingWriteClientMessage clientMessage;
-        auto* writeRequest = clientMessage.mutable_write_request();
-        const auto message = NUnitTest::RandomString(250 * 1024, std::rand());
-        const auto codecID = 3;
-        writeRequest->add_sequence_numbers(1);
-        writeRequest->add_message_sizes(message.size());
-        writeRequest->add_created_at_ms(TInstant::Now().MilliSeconds());
-        writeRequest->add_sent_at_ms(TInstant::Now().MilliSeconds());
-        writeRequest->add_blocks_offsets(0);
-        writeRequest->add_blocks_part_numbers(0);
-        writeRequest->add_blocks_message_counts(1);
-        writeRequest->add_blocks_uncompressed_sizes(message.size());
-        writeRequest->add_blocks_headers(TString(1, codecID));
-        writeRequest->add_blocks_data(message);
-        auto session = setup.InitWriteSession();
-
-
-        AssertSuccessfullStreamingOperation(session.first->Write(clientMessage), session.first, &clientMessage);
-
-        log << TLOG_INFO << "Wait for session to die";
-        AssertStreamingSessionDead(session.first, Ydb::StatusIds::BAD_REQUEST, Ydb::PersQueue::ErrorCode::BAD_REQUEST);
-    }
-
-    StreamingWriteClientMessage::InitRequest GenerateSessionSetupWithPreferredCluster(const TString preferredCluster) {
-        StreamingWriteClientMessage::InitRequest sessionSetup;
-        sessionSetup.set_preferred_cluster(preferredCluster);
-        sessionSetup.set_message_group_id("test-message-group-id-" + preferredCluster);
-        return sessionSetup;
-    };
-
-    Y_UNIT_TEST(PreferredCluster_TwoEnabledClustersAndWriteSessionsWithDifferentPreferredCluster_SessionWithMismatchedClusterDiesAndOthersAlive) {
-        APITestSetup setup{TEST_CASE_NAME};
-        auto log = setup.GetLog();
-
-        setup.GetPQConfig().SetClustersUpdateTimeoutSec(0);
-        setup.GetPQConfig().SetRemoteClusterEnabledDelaySec(0);
+    } 
+ 
+    Y_UNIT_TEST(Codecs_WriteMessageWithDefaultCodecs_MessagesAreAcknowledged) { 
+        APITestSetup setup{TEST_CASE_NAME}; 
+        auto log = setup.GetLog(); 
+        StreamingWriteClientMessage clientMessage; 
+        auto* writeRequest = clientMessage.mutable_write_request(); 
+        auto sequenceNumber = 1; 
+        auto messageCount = 0; 
+        const auto message = NUnitTest::RandomString(250 * 1024, std::rand()); 
+        auto compress = [](TString data, i32 codecID) { 
+            Y_UNUSED(codecID); 
+            return TString(data); 
+        }; 
+        TVector<char> defaultCodecs{0, 1, 2}; 
+        for (const auto& codecID : defaultCodecs) { 
+            auto compressedMessage = compress(message, codecID); 
+ 
+            writeRequest->add_sequence_numbers(sequenceNumber++); 
+            writeRequest->add_message_sizes(message.size()); 
+            writeRequest->add_created_at_ms(TInstant::Now().MilliSeconds()); 
+            writeRequest->add_sent_at_ms(TInstant::Now().MilliSeconds()); 
+            writeRequest->add_blocks_offsets(0); 
+            writeRequest->add_blocks_part_numbers(0); 
+            writeRequest->add_blocks_message_counts(1); 
+            writeRequest->add_blocks_uncompressed_sizes(message.size()); 
+            writeRequest->add_blocks_headers(TString(1, codecID)); 
+            writeRequest->add_blocks_data(compressedMessage); 
+            ++messageCount; 
+        } 
+        auto session = setup.InitWriteSession(); 
+ 
+ 
+        AssertSuccessfullStreamingOperation(session.first->Write(clientMessage), session.first, &clientMessage); 
+ 
+ 
+        StreamingWriteServerMessage serverMessage; 
+        log << TLOG_INFO << "Wait for write acknowledgement"; 
+        AssertSuccessfullStreamingOperation(session.first->Read(&serverMessage), session.first); 
+        UNIT_ASSERT_C(serverMessage.server_message_case() == StreamingWriteServerMessage::kBatchWriteResponse, serverMessage); 
+        UNIT_ASSERT_VALUES_EQUAL_C(defaultCodecs.size(), serverMessage.batch_write_response().offsets_size(), serverMessage); 
+    } 
+ 
+    Y_UNIT_TEST(Codecs_WriteMessageWithNonDefaultCodecThatHasToBeConfiguredAdditionally_SessionClosedWithBadRequestError) { 
+        APITestSetup setup{TEST_CASE_NAME}; 
+        auto log = setup.GetLog(); 
+        StreamingWriteClientMessage clientMessage; 
+        auto* writeRequest = clientMessage.mutable_write_request(); 
+        const auto message = NUnitTest::RandomString(250 * 1024, std::rand()); 
+        const auto codecID = 3; 
+        writeRequest->add_sequence_numbers(1); 
+        writeRequest->add_message_sizes(message.size()); 
+        writeRequest->add_created_at_ms(TInstant::Now().MilliSeconds()); 
+        writeRequest->add_sent_at_ms(TInstant::Now().MilliSeconds()); 
+        writeRequest->add_blocks_offsets(0); 
+        writeRequest->add_blocks_part_numbers(0); 
+        writeRequest->add_blocks_message_counts(1); 
+        writeRequest->add_blocks_uncompressed_sizes(message.size()); 
+        writeRequest->add_blocks_headers(TString(1, codecID)); 
+        writeRequest->add_blocks_data(message); 
+        auto session = setup.InitWriteSession(); 
+ 
+ 
+        AssertSuccessfullStreamingOperation(session.first->Write(clientMessage), session.first, &clientMessage); 
+ 
+        log << TLOG_INFO << "Wait for session to die"; 
+        AssertStreamingSessionDead(session.first, Ydb::StatusIds::BAD_REQUEST, Ydb::PersQueue::ErrorCode::BAD_REQUEST); 
+    } 
+ 
+    StreamingWriteClientMessage::InitRequest GenerateSessionSetupWithPreferredCluster(const TString preferredCluster) { 
+        StreamingWriteClientMessage::InitRequest sessionSetup; 
+        sessionSetup.set_preferred_cluster(preferredCluster); 
+        sessionSetup.set_message_group_id("test-message-group-id-" + preferredCluster); 
+        return sessionSetup; 
+    }; 
+ 
+    Y_UNIT_TEST(PreferredCluster_TwoEnabledClustersAndWriteSessionsWithDifferentPreferredCluster_SessionWithMismatchedClusterDiesAndOthersAlive) { 
+        APITestSetup setup{TEST_CASE_NAME}; 
+        auto log = setup.GetLog(); 
+ 
+        setup.GetPQConfig().SetClustersUpdateTimeoutSec(0); 
+        setup.GetPQConfig().SetRemoteClusterEnabledDelaySec(0); 
         setup.GetPQConfig().SetCloseClientSessionWithEnabledRemotePreferredClusterDelaySec(0);
-        auto sessionWithNoPreferredCluster = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(TString()));
-        auto sessionWithLocalPreffedCluster = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(setup.GetLocalCluster()));
-        auto sessionWithRemotePrefferedCluster = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(setup.GetRemoteCluster()));
-        grpc::ClientContext context;
-        auto sessionWithNoInitialization = setup.GetPersQueueService()->StreamingWrite(&context);
-
-        log << TLOG_INFO << "Wait for session with remote preferred cluster to die";
-        AssertStreamingSessionDead(sessionWithRemotePrefferedCluster.first, Ydb::StatusIds::ABORTED, Ydb::PersQueue::ErrorCode::PREFERRED_CLUSTER_MISMATCHED);
-        AssertStreamingSessionAlive(sessionWithNoPreferredCluster.first);
-        AssertStreamingSessionAlive(sessionWithLocalPreffedCluster.first);
-
-        setup.InitSession(sessionWithNoInitialization);
-        AssertStreamingSessionAlive(sessionWithNoInitialization);
-    }
-
-    Y_UNIT_TEST(PreferredCluster_DisabledRemoteClusterAndWriteSessionsWithDifferentPreferredClusterAndLaterRemoteClusterEnabled_SessionWithMismatchedClusterDiesAfterPreferredClusterEnabledAndOtherSessionsAlive) {
-        APITestSetup setup{TEST_CASE_NAME};
-        auto log = setup.GetLog();
-        log << TLOG_INFO << "Disable remote cluster " << setup.GetRemoteCluster().Quote();
-        setup.GetFlatMsgBusPQClient().UpdateDC(setup.GetRemoteCluster(), false, false);
-        setup.GetPQConfig().SetClustersUpdateTimeoutSec(0);
-        setup.GetPQConfig().SetRemoteClusterEnabledDelaySec(0);
-        setup.GetPQConfig().SetCloseClientSessionWithEnabledRemotePreferredClusterDelaySec(0);
-        auto sessionWithNoPreferredCluster = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(TString()));
-        auto sessionWithLocalPreffedCluster = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(setup.GetLocalCluster()));
-        auto sessionWithRemotePrefferedCluster = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(setup.GetRemoteCluster()));
-        AssertStreamingSessionAlive(sessionWithNoPreferredCluster.first);
-        AssertStreamingSessionAlive(sessionWithLocalPreffedCluster.first);
-        AssertStreamingSessionAlive(sessionWithRemotePrefferedCluster.first);
-
-        log << TLOG_INFO << "Enable remote cluster " << setup.GetRemoteCluster().Quote();
-        setup.GetFlatMsgBusPQClient().UpdateDC(setup.GetRemoteCluster(), false, true);
-
-        log << TLOG_INFO << "Wait for session with remote preferred cluster to die";
-        AssertStreamingSessionDead(sessionWithRemotePrefferedCluster.first, Ydb::StatusIds::ABORTED, Ydb::PersQueue::ErrorCode::PREFERRED_CLUSTER_MISMATCHED);
-        AssertStreamingSessionAlive(sessionWithNoPreferredCluster.first);
-        AssertStreamingSessionAlive(sessionWithLocalPreffedCluster.first);
-    }
-
-    Y_UNIT_TEST(PreferredCluster_EnabledRemotePreferredClusterAndCloseClientSessionWithEnabledRemotePreferredClusterDelaySec_SessionDiesOnlyAfterDelay) {
-        APITestSetup setup{TEST_CASE_NAME};
-        auto log = setup.GetLog();
-        setup.GetPQConfig().SetClustersUpdateTimeoutSec(0);
-        setup.GetPQConfig().SetRemoteClusterEnabledDelaySec(0);
+        auto sessionWithNoPreferredCluster = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(TString())); 
+        auto sessionWithLocalPreffedCluster = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(setup.GetLocalCluster())); 
+        auto sessionWithRemotePrefferedCluster = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(setup.GetRemoteCluster())); 
+        grpc::ClientContext context; 
+        auto sessionWithNoInitialization = setup.GetPersQueueService()->StreamingWrite(&context); 
+ 
+        log << TLOG_INFO << "Wait for session with remote preferred cluster to die"; 
+        AssertStreamingSessionDead(sessionWithRemotePrefferedCluster.first, Ydb::StatusIds::ABORTED, Ydb::PersQueue::ErrorCode::PREFERRED_CLUSTER_MISMATCHED); 
+        AssertStreamingSessionAlive(sessionWithNoPreferredCluster.first); 
+        AssertStreamingSessionAlive(sessionWithLocalPreffedCluster.first); 
+ 
+        setup.InitSession(sessionWithNoInitialization); 
+        AssertStreamingSessionAlive(sessionWithNoInitialization); 
+    } 
+ 
+    Y_UNIT_TEST(PreferredCluster_DisabledRemoteClusterAndWriteSessionsWithDifferentPreferredClusterAndLaterRemoteClusterEnabled_SessionWithMismatchedClusterDiesAfterPreferredClusterEnabledAndOtherSessionsAlive) { 
+        APITestSetup setup{TEST_CASE_NAME}; 
+        auto log = setup.GetLog(); 
+        log << TLOG_INFO << "Disable remote cluster " << setup.GetRemoteCluster().Quote(); 
+        setup.GetFlatMsgBusPQClient().UpdateDC(setup.GetRemoteCluster(), false, false); 
+        setup.GetPQConfig().SetClustersUpdateTimeoutSec(0); 
+        setup.GetPQConfig().SetRemoteClusterEnabledDelaySec(0); 
+        setup.GetPQConfig().SetCloseClientSessionWithEnabledRemotePreferredClusterDelaySec(0); 
+        auto sessionWithNoPreferredCluster = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(TString())); 
+        auto sessionWithLocalPreffedCluster = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(setup.GetLocalCluster())); 
+        auto sessionWithRemotePrefferedCluster = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(setup.GetRemoteCluster())); 
+        AssertStreamingSessionAlive(sessionWithNoPreferredCluster.first); 
+        AssertStreamingSessionAlive(sessionWithLocalPreffedCluster.first); 
+        AssertStreamingSessionAlive(sessionWithRemotePrefferedCluster.first); 
+ 
+        log << TLOG_INFO << "Enable remote cluster " << setup.GetRemoteCluster().Quote(); 
+        setup.GetFlatMsgBusPQClient().UpdateDC(setup.GetRemoteCluster(), false, true); 
+ 
+        log << TLOG_INFO << "Wait for session with remote preferred cluster to die"; 
+        AssertStreamingSessionDead(sessionWithRemotePrefferedCluster.first, Ydb::StatusIds::ABORTED, Ydb::PersQueue::ErrorCode::PREFERRED_CLUSTER_MISMATCHED); 
+        AssertStreamingSessionAlive(sessionWithNoPreferredCluster.first); 
+        AssertStreamingSessionAlive(sessionWithLocalPreffedCluster.first); 
+    } 
+ 
+    Y_UNIT_TEST(PreferredCluster_EnabledRemotePreferredClusterAndCloseClientSessionWithEnabledRemotePreferredClusterDelaySec_SessionDiesOnlyAfterDelay) { 
+        APITestSetup setup{TEST_CASE_NAME}; 
+        auto log = setup.GetLog(); 
+        setup.GetPQConfig().SetClustersUpdateTimeoutSec(0); 
+        setup.GetPQConfig().SetRemoteClusterEnabledDelaySec(0); 
         setup.GetPQConfig().SetCloseClientSessionWithEnabledRemotePreferredClusterDelaySec(0);
 
-        const auto edgeActorID = setup.GetServer().GetRuntime()->AllocateEdgeActor();
-
+        const auto edgeActorID = setup.GetServer().GetRuntime()->AllocateEdgeActor(); 
+ 
         setup.GetServer().GetRuntime()->Send(new IEventHandle(NPQ::NClusterTracker::MakeClusterTrackerID(), edgeActorID, new NPQ::NClusterTracker::TEvClusterTracker::TEvSubscribe));
         log << TLOG_INFO << "Wait for cluster tracker event";
         auto clustersUpdate = setup.GetServer().GetRuntime()->GrabEdgeEvent<NPQ::NClusterTracker::TEvClusterTracker::TEvClustersUpdate>();
-
-
-        auto session = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(setup.GetRemoteCluster()));
-
-        AssertStreamingSessionAlive(session.first);
-
-        AssertStreamingSessionDead(session.first, Ydb::StatusIds::ABORTED, Ydb::PersQueue::ErrorCode::PREFERRED_CLUSTER_MISMATCHED);
-    }
-
-    Y_UNIT_TEST(PreferredCluster_NonExistentPreferredCluster_SessionDiesOnlyAfterDelay) {
-        APITestSetup setup{TEST_CASE_NAME};
-        auto log = setup.GetLog();
-        setup.GetPQConfig().SetClustersUpdateTimeoutSec(0);
-        setup.GetPQConfig().SetRemoteClusterEnabledDelaySec(0);
+ 
+
+        auto session = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(setup.GetRemoteCluster())); 
+ 
+        AssertStreamingSessionAlive(session.first); 
+ 
+        AssertStreamingSessionDead(session.first, Ydb::StatusIds::ABORTED, Ydb::PersQueue::ErrorCode::PREFERRED_CLUSTER_MISMATCHED); 
+    } 
+ 
+    Y_UNIT_TEST(PreferredCluster_NonExistentPreferredCluster_SessionDiesOnlyAfterDelay) { 
+        APITestSetup setup{TEST_CASE_NAME}; 
+        auto log = setup.GetLog(); 
+        setup.GetPQConfig().SetClustersUpdateTimeoutSec(0); 
+        setup.GetPQConfig().SetRemoteClusterEnabledDelaySec(0); 
         setup.GetPQConfig().SetCloseClientSessionWithEnabledRemotePreferredClusterDelaySec(2);
-
+ 
         TInstant now(TInstant::Now());
-        auto session = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster("non-existent-cluster"));
-        AssertStreamingSessionAlive(session.first);
-
-        AssertStreamingSessionDead(session.first, Ydb::StatusIds::ABORTED, Ydb::PersQueue::ErrorCode::PREFERRED_CLUSTER_MISMATCHED);
+        auto session = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster("non-existent-cluster")); 
+        AssertStreamingSessionAlive(session.first); 
+ 
+        AssertStreamingSessionDead(session.first, Ydb::StatusIds::ABORTED, Ydb::PersQueue::ErrorCode::PREFERRED_CLUSTER_MISMATCHED); 
         UNIT_ASSERT(TInstant::Now() - now > TDuration::MilliSeconds(1999));
-    }
-
-    Y_UNIT_TEST(PreferredCluster_EnabledRemotePreferredClusterAndRemoteClusterEnabledDelaySec_SessionDiesOnlyAfterDelay) {
-        APITestSetup setup{TEST_CASE_NAME};
-        auto log = setup.GetLog();
-        setup.GetPQConfig().SetClustersUpdateTimeoutSec(0);
+    } 
+ 
+    Y_UNIT_TEST(PreferredCluster_EnabledRemotePreferredClusterAndRemoteClusterEnabledDelaySec_SessionDiesOnlyAfterDelay) { 
+        APITestSetup setup{TEST_CASE_NAME}; 
+        auto log = setup.GetLog(); 
+        setup.GetPQConfig().SetClustersUpdateTimeoutSec(0); 
         setup.GetPQConfig().SetCloseClientSessionWithEnabledRemotePreferredClusterDelaySec(2);
-        const auto edgeActorID = setup.GetServer().GetRuntime()->AllocateEdgeActor();
-
+        const auto edgeActorID = setup.GetServer().GetRuntime()->AllocateEdgeActor(); 
+ 
         setup.GetPQConfig().SetRemoteClusterEnabledDelaySec(0);
-
+ 
         TInstant now(TInstant::Now());
-        auto session = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(setup.GetRemoteCluster()));
-
-        setup.GetServer().GetRuntime()->Send(new IEventHandle(NPQ::NClusterTracker::MakeClusterTrackerID(), edgeActorID, new NPQ::NClusterTracker::TEvClusterTracker::TEvSubscribe));
-        log << TLOG_INFO << "Wait for cluster tracker event";
-        auto clustersUpdate = setup.GetServer().GetRuntime()->GrabEdgeEvent<NPQ::NClusterTracker::TEvClusterTracker::TEvClustersUpdate>();
-        AssertStreamingSessionAlive(session.first);
-
+        auto session = setup.InitWriteSession(GenerateSessionSetupWithPreferredCluster(setup.GetRemoteCluster())); 
+ 
+        setup.GetServer().GetRuntime()->Send(new IEventHandle(NPQ::NClusterTracker::MakeClusterTrackerID(), edgeActorID, new NPQ::NClusterTracker::TEvClusterTracker::TEvSubscribe)); 
+        log << TLOG_INFO << "Wait for cluster tracker event"; 
+        auto clustersUpdate = setup.GetServer().GetRuntime()->GrabEdgeEvent<NPQ::NClusterTracker::TEvClusterTracker::TEvClustersUpdate>(); 
+        AssertStreamingSessionAlive(session.first); 
+ 
         AssertStreamingSessionDead(session.first, Ydb::StatusIds::ABORTED, Ydb::PersQueue::ErrorCode::PREFERRED_CLUSTER_MISMATCHED);
-
+ 
         UNIT_ASSERT(TInstant::Now() - now > TDuration::MilliSeconds(1999));
-    }
-
-    Y_UNIT_TEST(PreferredCluster_RemotePreferredClusterEnabledWhileSessionInitializing_SessionDiesOnlyAfterInitializationAndDelay) {
-        APITestSetup setup{TEST_CASE_NAME};
-        auto log = setup.GetLog();
-        setup.GetPQConfig().SetClustersUpdateTimeoutSec(0);
-        setup.GetPQConfig().SetRemoteClusterEnabledDelaySec(0);
+    } 
+ 
+    Y_UNIT_TEST(PreferredCluster_RemotePreferredClusterEnabledWhileSessionInitializing_SessionDiesOnlyAfterInitializationAndDelay) { 
+        APITestSetup setup{TEST_CASE_NAME}; 
+        auto log = setup.GetLog(); 
+        setup.GetPQConfig().SetClustersUpdateTimeoutSec(0); 
+        setup.GetPQConfig().SetRemoteClusterEnabledDelaySec(0); 
         setup.GetPQConfig().SetCloseClientSessionWithEnabledRemotePreferredClusterDelaySec(2);
-        const auto edgeActorID = setup.GetServer().GetRuntime()->AllocateEdgeActor();
-        setup.GetFlatMsgBusPQClient().UpdateDC(setup.GetRemoteCluster(), false, false);
-
-        grpc::ClientContext context;
-        auto session = setup.GetPersQueueService()->StreamingWrite(&context);
-
-        setup.GetFlatMsgBusPQClient().UpdateDC(setup.GetRemoteCluster(), false, true);
-
-        setup.GetServer().GetRuntime()->Send(new IEventHandle(NPQ::NClusterTracker::MakeClusterTrackerID(), edgeActorID, new NPQ::NClusterTracker::TEvClusterTracker::TEvSubscribe));
-        log << TLOG_INFO << "Wait for cluster tracker event";
-        auto clustersUpdate = setup.GetServer().GetRuntime()->GrabEdgeEvent<NPQ::NClusterTracker::TEvClusterTracker::TEvClustersUpdate>();
+        const auto edgeActorID = setup.GetServer().GetRuntime()->AllocateEdgeActor(); 
+        setup.GetFlatMsgBusPQClient().UpdateDC(setup.GetRemoteCluster(), false, false); 
+ 
+        grpc::ClientContext context; 
+        auto session = setup.GetPersQueueService()->StreamingWrite(&context); 
+ 
+        setup.GetFlatMsgBusPQClient().UpdateDC(setup.GetRemoteCluster(), false, true); 
+ 
+        setup.GetServer().GetRuntime()->Send(new IEventHandle(NPQ::NClusterTracker::MakeClusterTrackerID(), edgeActorID, new NPQ::NClusterTracker::TEvClusterTracker::TEvSubscribe)); 
+        log << TLOG_INFO << "Wait for cluster tracker event"; 
+        auto clustersUpdate = setup.GetServer().GetRuntime()->GrabEdgeEvent<NPQ::NClusterTracker::TEvClusterTracker::TEvClustersUpdate>(); 
         TInstant now(TInstant::Now());
-        setup.InitSession(session, GenerateSessionSetupWithPreferredCluster(setup.GetRemoteCluster()));
+        setup.InitSession(session, GenerateSessionSetupWithPreferredCluster(setup.GetRemoteCluster())); 
 
-        AssertStreamingSessionAlive(session);
-
-        log << TLOG_INFO << "Set small delay and wait for initialized session with remote preferred cluster to die";
-        AssertStreamingSessionDead(session, Ydb::StatusIds::ABORTED, Ydb::PersQueue::ErrorCode::PREFERRED_CLUSTER_MISMATCHED);
+        AssertStreamingSessionAlive(session); 
+ 
+        log << TLOG_INFO << "Set small delay and wait for initialized session with remote preferred cluster to die"; 
+        AssertStreamingSessionDead(session, Ydb::StatusIds::ABORTED, Ydb::PersQueue::ErrorCode::PREFERRED_CLUSTER_MISMATCHED); 
 
         UNIT_ASSERT(TInstant::Now() - now > TDuration::MilliSeconds(1999));
 
-    }
+    } 
 
     Y_UNIT_TEST(SchemeOperationsTest) {
         NPersQueue::TTestServer server;
diff --git a/ydb/services/persqueue_v1/ut/api_test_setup.h b/ydb/services/persqueue_v1/ut/api_test_setup.h
index 8d5d82b33d..4b8963bc3e 100644
--- a/ydb/services/persqueue_v1/ut/api_test_setup.h
+++ b/ydb/services/persqueue_v1/ut/api_test_setup.h
@@ -1,120 +1,120 @@
-#pragma once
-#include "pq_data_writer.h"
-#include "test_utils.h"
-
+#pragma once 
+#include "pq_data_writer.h" 
+#include "test_utils.h" 
+ 
 #include <ydb/public/api/grpc/draft/ydb_persqueue_v1.grpc.pb.h>
 #include <ydb/core/testlib/test_pq_client.h>
-
+ 
 #include <google/protobuf/message.h>
 #include <library/cpp/logger/log.h>
 #include <library/cpp/testing/unittest/registar.h>
 #include <library/cpp/testing/unittest/tests_data.h>
-#include <util/string/builder.h>
-
-class APITestSetup {
-private:
-    using TStreamingWriteClientMessage = Ydb::PersQueue::V1::StreamingWriteClientMessage;
-    using TStreamingWriteServerMessage = Ydb::PersQueue::V1::StreamingWriteServerMessage;
-    TLog Log;
+#include <util/string/builder.h> 
+ 
+class APITestSetup { 
+private: 
+    using TStreamingWriteClientMessage = Ydb::PersQueue::V1::StreamingWriteClientMessage; 
+    using TStreamingWriteServerMessage = Ydb::PersQueue::V1::StreamingWriteServerMessage; 
+    TLog Log; 
     NPersQueue::TTestServer server;
-    std::shared_ptr<::grpc::Channel> channel;
-    std::unique_ptr<Ydb::PersQueue::V1::PersQueueService::Stub> service;
-public:
-    APITestSetup(const TString& testCaseName)
-        : Log("cerr")
+    std::shared_ptr<::grpc::Channel> channel; 
+    std::unique_ptr<Ydb::PersQueue::V1::PersQueueService::Stub> service; 
+public: 
+    APITestSetup(const TString& testCaseName) 
+        : Log("cerr") 
         , server(NPersQueue::TTestServer())
         , channel(grpc::CreateChannel("localhost:" + ToString(server.GrpcPort), grpc::InsecureChannelCredentials()))
-        , service(Ydb::PersQueue::V1::PersQueueService::NewStub(channel))
-    {
-        Log.SetFormatter([testCaseName](ELogPriority priority, TStringBuf message) {
-            return TStringBuilder() << TInstant::Now() << " :" << testCaseName << " " << priority << ": " << message << Endl;
-        });
+        , service(Ydb::PersQueue::V1::PersQueueService::NewStub(channel)) 
+    { 
+        Log.SetFormatter([testCaseName](ELogPriority priority, TStringBuf message) { 
+            return TStringBuilder() << TInstant::Now() << " :" << testCaseName << " " << priority << ": " << message << Endl; 
+        }); 
         server.CleverServer->GetRuntime()->SetLogPriority(NKikimrServices::PQ_WRITE_PROXY, NActors::NLog::PRI_DEBUG);
         server.CleverServer->GetRuntime()->SetLogPriority(NKikimrServices::PQ_READ_PROXY, NActors::NLog::PRI_DEBUG);
         server.AnnoyingClient->CreateTopic("rt3.dc1--" + TString(GetTestTopic()), 1);
         NKikimr::NPersQueueTests::TPQDataWriter writer(GetTestMessageGroupId(), server);
-
-        auto seed = TInstant::Now().MicroSeconds();
-        // This makes failing randomized tests (for example with NUnitTest::RandomString(size, std::rand()) calls) reproducable
-        Log << TLOG_INFO << "Random seed for debugging is " << seed;
-        std::srand(seed);
-    }
-
-    TLog& GetLog() {
-        return Log;
-    }
-
-    TString GetTestTopic() {
-        return "topic1";
-    }
-
-    TString GetTestMessageGroupId() {
-        return "test-message-group-id";
-    }
-
-    TString GetLocalCluster() {
-        return "dc1";
-    }
-
-    TString GetRemoteCluster() {
-        return "dc2";
-    }
-
-    TDuration GetLongDelay() {
-        return TDuration::Max() - TDuration::Seconds(1) /* So delay does not get mixed up with infinity */;
-    }
-
-    NKikimr::Tests::TServer& GetServer() {
+ 
+        auto seed = TInstant::Now().MicroSeconds(); 
+        // This makes failing randomized tests (for example with NUnitTest::RandomString(size, std::rand()) calls) reproducable 
+        Log << TLOG_INFO << "Random seed for debugging is " << seed; 
+        std::srand(seed); 
+    } 
+ 
+    TLog& GetLog() { 
+        return Log; 
+    } 
+ 
+    TString GetTestTopic() { 
+        return "topic1"; 
+    } 
+ 
+    TString GetTestMessageGroupId() { 
+        return "test-message-group-id"; 
+    } 
+ 
+    TString GetLocalCluster() { 
+        return "dc1"; 
+    } 
+ 
+    TString GetRemoteCluster() { 
+        return "dc2"; 
+    } 
+ 
+    TDuration GetLongDelay() { 
+        return TDuration::Max() - TDuration::Seconds(1) /* So delay does not get mixed up with infinity */; 
+    } 
+ 
+    NKikimr::Tests::TServer& GetServer() { 
         return *server.CleverServer;
-    }
-
-    TString GetPQRoot() {
-        return "/Root/PQ";
-    }
-
-    NKikimrPQ::TPQConfig& GetPQConfig() {
+    } 
+ 
+    TString GetPQRoot() { 
+        return "/Root/PQ"; 
+    } 
+ 
+    NKikimrPQ::TPQConfig& GetPQConfig() { 
         return server.CleverServer->GetRuntime()->GetAppData().PQConfig;
-    }
-
-    NKikimr::NPersQueueTests::TFlatMsgBusPQClient& GetFlatMsgBusPQClient() {
+    } 
+ 
+    NKikimr::NPersQueueTests::TFlatMsgBusPQClient& GetFlatMsgBusPQClient() { 
         return *server.AnnoyingClient;
-    }
-
-    std::unique_ptr<Ydb::PersQueue::V1::PersQueueService::Stub>& GetPersQueueService() {
-        return service;
-    }
-
-    std::pair<std::unique_ptr<grpc::ClientReaderWriter<TStreamingWriteClientMessage, TStreamingWriteServerMessage>>, std::unique_ptr<grpc::ClientContext>> InitWriteSession(
-        const typename TStreamingWriteClientMessage::InitRequest& setup = TStreamingWriteClientMessage::InitRequest())
-    {
-        auto context = std::make_unique<grpc::ClientContext>();
-        auto stream = service->StreamingWrite(context.get());
-        InitSession(stream, setup);
-        return std::make_pair(std::move(stream), std::move(context));
-    }
-
-    // Initializes session with default (possible overwriten by setup parameter) values and returns initialization response
-    template<typename TClientMessage, typename TServerMessage>
-    TServerMessage InitSession(std::unique_ptr<grpc::ClientReaderWriter<TClientMessage, TServerMessage>>& stream,
-        const typename TClientMessage::InitRequest& setup = typename TClientMessage::InitRequest())
-    {
-        TClientMessage clientMessage;
-        // TODO: Replace with MergeFrom?
-        clientMessage.mutable_init_request()->CopyFrom(setup);
-        if (setup.topic().empty()) {
-            clientMessage.mutable_init_request()->set_topic(GetTestTopic());
-        }
-        if (setup.message_group_id().empty()) {
-            clientMessage.mutable_init_request()->set_message_group_id(GetTestMessageGroupId());
-        }
-        AssertSuccessfullStreamingOperation(stream->Write(clientMessage), stream, &clientMessage);
-
-        TServerMessage serverMessage;
-        Log << TLOG_INFO << "Wait for \"init_response\"";
-        AssertSuccessfullStreamingOperation(stream->Read(&serverMessage), stream);
+    } 
+ 
+    std::unique_ptr<Ydb::PersQueue::V1::PersQueueService::Stub>& GetPersQueueService() { 
+        return service; 
+    } 
+ 
+    std::pair<std::unique_ptr<grpc::ClientReaderWriter<TStreamingWriteClientMessage, TStreamingWriteServerMessage>>, std::unique_ptr<grpc::ClientContext>> InitWriteSession( 
+        const typename TStreamingWriteClientMessage::InitRequest& setup = TStreamingWriteClientMessage::InitRequest()) 
+    { 
+        auto context = std::make_unique<grpc::ClientContext>(); 
+        auto stream = service->StreamingWrite(context.get()); 
+        InitSession(stream, setup); 
+        return std::make_pair(std::move(stream), std::move(context)); 
+    } 
+ 
+    // Initializes session with default (possible overwriten by setup parameter) values and returns initialization response 
+    template<typename TClientMessage, typename TServerMessage> 
+    TServerMessage InitSession(std::unique_ptr<grpc::ClientReaderWriter<TClientMessage, TServerMessage>>& stream, 
+        const typename TClientMessage::InitRequest& setup = typename TClientMessage::InitRequest()) 
+    { 
+        TClientMessage clientMessage; 
+        // TODO: Replace with MergeFrom? 
+        clientMessage.mutable_init_request()->CopyFrom(setup); 
+        if (setup.topic().empty()) { 
+            clientMessage.mutable_init_request()->set_topic(GetTestTopic()); 
+        } 
+        if (setup.message_group_id().empty()) { 
+            clientMessage.mutable_init_request()->set_message_group_id(GetTestMessageGroupId()); 
+        } 
+        AssertSuccessfullStreamingOperation(stream->Write(clientMessage), stream, &clientMessage); 
+ 
+        TServerMessage serverMessage; 
+        Log << TLOG_INFO << "Wait for \"init_response\""; 
+        AssertSuccessfullStreamingOperation(stream->Read(&serverMessage), stream); 
         Cerr << "Init response: " << serverMessage.ShortDebugString() << Endl;
-        UNIT_ASSERT_C(serverMessage.server_message_case() == TServerMessage::kInitResponse, serverMessage);
-        Log << TLOG_INFO << "Session ID is " << serverMessage.init_response().session_id().Quote();
-        return serverMessage;
-    }
-};
+        UNIT_ASSERT_C(serverMessage.server_message_case() == TServerMessage::kInitResponse, serverMessage); 
+        Log << TLOG_INFO << "Session ID is " << serverMessage.init_response().session_id().Quote(); 
+        return serverMessage; 
+    } 
+}; 
diff --git a/ydb/services/persqueue_v1/ut/pq_data_writer.h b/ydb/services/persqueue_v1/ut/pq_data_writer.h
index caef894060..71f271fb14 100644
--- a/ydb/services/persqueue_v1/ut/pq_data_writer.h
+++ b/ydb/services/persqueue_v1/ut/pq_data_writer.h
@@ -1,5 +1,5 @@
 #pragma once
-#include "test_utils.h"
+#include "test_utils.h" 
 #include <ydb/core/testlib/test_pq_client.h>
 #include <ydb/public/api/grpc/draft/ydb_persqueue_v1.grpc.pb.h>
 #include <ydb/public/api/protos/persqueue_error_codes_v1.pb.h>
@@ -178,7 +178,7 @@ public:
                 continue;
             }
 
-            AssertSuccessfullStreamingOperation(stream->Read(&resp), stream);
+            AssertSuccessfullStreamingOperation(stream->Read(&resp), stream); 
             if (resp.status() == Ydb::StatusIds::UNAVAILABLE) {
                 continue;
             }
@@ -223,16 +223,16 @@ public:
         return 0;
     }
 
-    ui32 Write(const TString& topic, const TVector<TString>& data, bool error = false, const TMaybe<TString>& ticket = {}) {
+    ui32 Write(const TString& topic, const TVector<TString>& data, bool error = false, const TMaybe<TString>& ticket = {}) { 
         return WriteImpl(topic, {data}, error, ticket);
     }
 
 private:
-    ui32 WriteImpl(const TString& topic, const TVector<TString>& data, bool error, const TMaybe<TString>& ticket) {
+    ui32 WriteImpl(const TString& topic, const TVector<TString>& data, bool error, const TMaybe<TString>& ticket) { 
         grpc::ClientContext context;
 
-        if (ticket)
-            context.AddMetadata("x-ydb-auth-ticket", *ticket);
+        if (ticket) 
+            context.AddMetadata("x-ydb-auth-ticket", *ticket); 
 
 
         auto stream = StubP_->StreamingWrite(&context);
@@ -300,20 +300,20 @@ private:
     }
 
     template <typename S>
-    void Flush(const TVector<TString>& data, S& stream, const TMaybe<TString>& ticket) {
+    void Flush(const TVector<TString>& data, S& stream, const TMaybe<TString>& ticket) { 
         Ydb::PersQueue::V1::StreamingWriteClientMessage  request;
         Ydb::PersQueue::V1::StreamingWriteServerMessage response;
 
-        if (ticket) {
-            request.mutable_update_token_request()->set_token(*ticket);
-            Cerr << "update user token request: " << request << Endl;
-            if (!stream->Write(request)) {
-                ythrow yexception() << "write fail";
-            }
-            UNIT_ASSERT(stream->Read(&response));
-            UNIT_ASSERT_C(response.server_message_case() == Ydb::PersQueue::V1::StreamingWriteServerMessage::kUpdateTokenResponse, response);
-        }
-
+        if (ticket) { 
+            request.mutable_update_token_request()->set_token(*ticket); 
+            Cerr << "update user token request: " << request << Endl; 
+            if (!stream->Write(request)) { 
+                ythrow yexception() << "write fail"; 
+            } 
+            UNIT_ASSERT(stream->Read(&response)); 
+            UNIT_ASSERT_C(response.server_message_case() == Ydb::PersQueue::V1::StreamingWriteServerMessage::kUpdateTokenResponse, response); 
+        } 
+ 
         TVector<ui64> allSeqNo;
         auto* mutableData = request.mutable_write_request();
         ui32 offset = 0;
@@ -329,8 +329,8 @@ private:
             mutableData->add_blocks_part_numbers(0);
             mutableData->add_blocks_message_counts(1);
             mutableData->add_blocks_uncompressed_sizes(d.size());
-            mutableData->add_blocks_headers(TString(1, '\0') /* RAW codec ID */);
-            mutableData->add_blocks_data(d);
+            mutableData->add_blocks_headers(TString(1, '\0') /* RAW codec ID */); 
+            mutableData->add_blocks_data(d); 
         }
 
         Cerr << "request: " << request << Endl;
diff --git a/ydb/services/persqueue_v1/ut/rate_limiter_test_setup.cpp b/ydb/services/persqueue_v1/ut/rate_limiter_test_setup.cpp
index 779d60e778..f3f78567ef 100644
--- a/ydb/services/persqueue_v1/ut/rate_limiter_test_setup.cpp
+++ b/ydb/services/persqueue_v1/ut/rate_limiter_test_setup.cpp
@@ -1,14 +1,14 @@
-#include "rate_limiter_test_setup.h"
+#include "rate_limiter_test_setup.h" 
 #include <ydb/library/persqueue/topic_parser/topic_parser.h>
 #include <library/cpp/logger/priority.h>
-
-using namespace NPersQueue;
-using namespace Ydb::PersQueue;
-using namespace NKikimr::Tests;
-
-
-namespace NKikimr::NPersQueueTests {
-
+ 
+using namespace NPersQueue; 
+using namespace Ydb::PersQueue; 
+using namespace NKikimr::Tests; 
+ 
+
+namespace NKikimr::NPersQueueTests { 
+ 
 TRateLimiterTestSetup::TRateLimiterTestSetup(
     NKikimrPQ::TPQConfig::TQuotingConfig::ELimitedEntity limitedEntity,
     double writeAccountQuota,
@@ -19,28 +19,28 @@ TRateLimiterTestSetup::TRateLimiterTestSetup(
     , LimitedEntity(limitedEntity)
     , WriteAccountQuota(writeAccountQuota)
     , ReadAccountQuota(readAccountQuota)
-{
+{ 
     Start(enableReadQuoting);
-}
-
+} 
+ 
 void TRateLimiterTestSetup::CreateTopic(const TString& path) {
-    const TString name = BuildFullTopicName(path, "dc1");
-    const TString account = GetAccount(name);
-
-    Cerr << "Creating topic \"" << name << "\"" << Endl;
+    const TString name = BuildFullTopicName(path, "dc1"); 
+    const TString account = GetAccount(name); 
+ 
+    Cerr << "Creating topic \"" << name << "\"" << Endl; 
     Server->AnnoyingClient->CreateTopic(name, 1);
-
+ 
     CreateKesus(account);
     CreateQuotaResources(path, "write-quota", false);
     CreateQuotaResources(path, "read-quota", true);
 }
-
+ 
 void TRateLimiterTestSetup::CreateConsumer(const TString& path) {
     const TString account = GetAccount(path);
-
+ 
     Cerr << "Creating consumer \"" << path << "\"" << Endl;
     Server->AnnoyingClient->CreateConsumer(path);
-
+ 
     CreateKesus(account);
     CreateQuotaResources(path, "write-quota", true);
     CreateQuotaResources(path, "read-quota", false);
@@ -68,10 +68,10 @@ void TRateLimiterTestSetup::CreateKesus(const TString& account) {
 }
 
 void TRateLimiterTestSetup::CreateQuotaResources(const TString& path, const TString& quotaPrefix, bool excludeLastComponent) {
-    TVector<TString> pathComponents = SplitPath(path);
+    TVector<TString> pathComponents = SplitPath(path); 
     if (pathComponents.size() <= 1) {
         return;
-    }
+    } 
     TStringBuilder prefixPath;
     prefixPath << quotaPrefix;
 
@@ -91,59 +91,59 @@ void TRateLimiterTestSetup::CreateQuotaResources(const TString& path, const TStr
             "Status: " << Ydb::StatusIds::StatusCode_Name(statusCode)
         );
     }
-}
-
+} 
+ 
 /*
 THolder<Ydb::PersQueue::IProducer> TRateLimiterTestSetup::StartProducer(const TString& topicPath, bool compress) {
     Ydb::PersQueue::TProducerSettings producerSettings;
     producerSettings.Server = Ydb::PersQueue::TServerSetting("localhost", Server->GrpcPort);
-    producerSettings.Topic = topicPath;
+    producerSettings.Topic = topicPath; 
     producerSettings.SourceId = "TRateLimiterTestSetupSourceId";
     producerSettings.Codec = compress ? "gzip" : "raw";
     THolder<Ydb::PersQueue::IProducer> producer = PQLib->CreateProducer(producerSettings);
-    auto startResult = producer->Start();
-    UNIT_ASSERT_EQUAL_C(Ydb::StatusIds::SUCCESS, startResult.GetValueSync().Response.status(), "Response: " << startResult.GetValueSync().Response);
-    return producer;
-}
+    auto startResult = producer->Start(); 
+    UNIT_ASSERT_EQUAL_C(Ydb::StatusIds::SUCCESS, startResult.GetValueSync().Response.status(), "Response: " << startResult.GetValueSync().Response); 
+    return producer; 
+} 
 */
-
+ 
 void TRateLimiterTestSetup::Start(bool enableReadQuoting) {
     InitServer(enableReadQuoting);
-    InitQuoting();
+    InitQuoting(); 
     WaitWritePQServiceInitialization();
-}
-
+} 
+ 
 void TRateLimiterTestSetup::InitServer(bool enableReadQuoting) {
     auto& settings = Server->ServerSettings;
-
+ 
     settings.PQConfig.MutableQuotingConfig()->SetEnableQuoting(true);
     settings.PQConfig.MutableQuotingConfig()->SetEnableReadQuoting(enableReadQuoting);
     settings.PQConfig.MutableQuotingConfig()->SetTopicWriteQuotaEntityToLimit(LimitedEntity);
-
+ 
     Server->GrpcServerOptions.SetMaxMessageSize(130 * 1024 * 1024);
     Server->StartServer();
     Server->EnableLogs(
-        {
-            NKikimrServices::PQ_READ_PROXY,
-            NKikimrServices::PQ_WRITE_PROXY,
-            NKikimrServices::PERSQUEUE,
-            NKikimrServices::QUOTER_SERVICE,
-            NKikimrServices::QUOTER_PROXY,
-            NKikimrServices::KESUS_TABLET,
+        { 
+            NKikimrServices::PQ_READ_PROXY, 
+            NKikimrServices::PQ_WRITE_PROXY, 
+            NKikimrServices::PERSQUEUE, 
+            NKikimrServices::QUOTER_SERVICE, 
+            NKikimrServices::QUOTER_PROXY, 
+            NKikimrServices::KESUS_TABLET, 
             NKikimrServices::PQ_READ_SPEED_LIMITER
         },
         NActors::NLog::PRI_TRACE
-    );
-}
-
-void TRateLimiterTestSetup::InitQuoting() {
+    ); 
+} 
+ 
+void TRateLimiterTestSetup::InitQuoting() { 
     Server->AnnoyingClient->MkDir("/Root", "PersQueue");
     Server->AnnoyingClient->MkDir("/Root/PersQueue", "System");
     Server->AnnoyingClient->MkDir("/Root/PersQueue/System", "Quoters");
-}
-
+} 
+ 
 void TRateLimiterTestSetup::WaitWritePQServiceInitialization() {
     PQDataWriter = MakeHolder<TPQDataWriter>("writer_source_id", *Server);
-}
+} 
 
 }
diff --git a/ydb/services/persqueue_v1/ut/rate_limiter_test_setup.h b/ydb/services/persqueue_v1/ut/rate_limiter_test_setup.h
index 01529818e1..1196574139 100644
--- a/ydb/services/persqueue_v1/ut/rate_limiter_test_setup.h
+++ b/ydb/services/persqueue_v1/ut/rate_limiter_test_setup.h
@@ -1,59 +1,59 @@
-#pragma once
+#pragma once 
 #include "pq_data_writer.h"
 
 #include <ydb/core/testlib/test_client.h>
 #include <ydb/core/testlib/test_pq_client.h>
-
-namespace NKikimr::NPersQueueTests {
-
-class TRateLimiterTestSetup {
-public:
+ 
+namespace NKikimr::NPersQueueTests { 
+ 
+class TRateLimiterTestSetup { 
+public: 
     explicit TRateLimiterTestSetup(
         NKikimrPQ::TPQConfig::TQuotingConfig::ELimitedEntity limitedEntity,
         double writeAccountQuota = 1000.0,
         double readAccountQuota = 1000.0,
         bool enableReadQuoting = false
     );
-
+ 
     void CreateTopic(const TString& path);
     void CreateConsumer(const TString& path);
-
-    // namespace NPersQueue = Ydb::PersQueue;
+ 
+    // namespace NPersQueue = Ydb::PersQueue; 
 //    THolder<Ydb::PersQueue::IProducer> StartProducer(const TString& topicPath, bool compress = false);
-
-    // Getters
-    ui16 GetGrpcPort() const {
+ 
+    // Getters 
+    ui16 GetGrpcPort() const { 
         return Server->GrpcPort;
-    }
-
-    ui16 GetMsgBusPort() const {
+    } 
+ 
+    ui16 GetMsgBusPort() const { 
         return Server->Port;
-    }
-
-    NKikimr::Tests::TServer& GetServer() {
+    } 
+ 
+    NKikimr::Tests::TServer& GetServer() { 
         return *Server->CleverServer;
-    }
-
-    NPersQueueTests::TFlatMsgBusPQClient& GetClient() {
+    } 
+ 
+    NPersQueueTests::TFlatMsgBusPQClient& GetClient() { 
         return *Server->AnnoyingClient;
-    }
-
-private:
+    } 
+ 
+private: 
     void CreateKesus(const TString& account);
     void CreateQuotaResources(const TString& path, const TString& quotaPrefix, bool excludeLastComponent);
-
+ 
     void Start(bool enableReadQuoting);
 
     void InitServer(bool enableReadQuoting);
-    void InitQuoting();
+    void InitQuoting(); 
     void WaitWritePQServiceInitialization();
-
-private:
+ 
+private: 
     THolder<NPersQueue::TTestServer> Server;
     THolder<TPQDataWriter> PQDataWriter; // For waiting for grpc writer service initialization.
     const NKikimrPQ::TPQConfig::TQuotingConfig::ELimitedEntity LimitedEntity;
     double WriteAccountQuota;
     double ReadAccountQuota;
     const TString QuotersRootPath = "/Root/PersQueue/System/Quoters";
-};
-}
+}; 
+} 
diff --git a/ydb/services/persqueue_v1/ut/test_utils.h b/ydb/services/persqueue_v1/ut/test_utils.h
index c02308b0d7..50ee04ff94 100644
--- a/ydb/services/persqueue_v1/ut/test_utils.h
+++ b/ydb/services/persqueue_v1/ut/test_utils.h
@@ -1,16 +1,16 @@
-#pragma once
+#pragma once 
 #include <ydb/public/api/protos/ydb_status_codes.pb.h>
 #include <ydb/public/api/protos/persqueue_error_codes_v1.pb.h>
 #include <ydb/core/testlib/test_pq_client.h>
-
+ 
 #include <library/cpp/testing/unittest/registar.h>
 #include <google/protobuf/message.h>
-#include <contrib/libs/grpc/include/grpcpp/support/sync_stream.h>
-#include <util/string/builder.h>
+#include <contrib/libs/grpc/include/grpcpp/support/sync_stream.h> 
+#include <util/string/builder.h> 
 #include <util/system/type_name.h>
-
+ 
 #define TEST_CASE_NAME (TypeName(*this).rfind("TTestCase") != TString::npos ? TypeName(*this).substr(TypeName(*this).rfind("TTestCase") + 9) : TypeName(*this))
-
+ 
 static constexpr int DEBUG_LOG_LEVEL = 7;
 
 using namespace NKikimr::NPersQueueTests;
@@ -20,62 +20,62 @@ inline void WaitACLModification() {
     Sleep(TDuration::Seconds(5));
 }
 
-// TODO: Remove and replace all usage with ApiTestSetup
-#define SETUP_API_TEST_PREREQUISITES()\
-    const TString topic = "topic1";\
-    const TString cluster = "dc1";\
-    const TString pqRoot = "/Root/PQ";\
-    const TString messageGroupId = "test-message-group-id";\
-    TPortManager pm;\
-    const ui16 port = pm.GetPort(2134);\
-    const ui16 grpc = pm.GetPort(2135);\
-    TServerSettings settings = PQSettings(port);\
-    TServer server = TServer(settings);\
+// TODO: Remove and replace all usage with ApiTestSetup 
+#define SETUP_API_TEST_PREREQUISITES()\ 
+    const TString topic = "topic1";\ 
+    const TString cluster = "dc1";\ 
+    const TString pqRoot = "/Root/PQ";\ 
+    const TString messageGroupId = "test-message-group-id";\ 
+    TPortManager pm;\ 
+    const ui16 port = pm.GetPort(2134);\ 
+    const ui16 grpc = pm.GetPort(2135);\ 
+    TServerSettings settings = PQSettings(port);\ 
+    TServer server = TServer(settings);\ 
     server.EnableGRpc(NGrpc::TServerOptions().SetHost("localhost").SetPort(grpc));\
-    TFlatMsgBusPQClient client(settings, grpc);\
+    TFlatMsgBusPQClient client(settings, grpc);\ 
     client.FullInit();\
-    client.CreateTopic("rt3.dc1--" + TString(topic), 1);\
-    EnableLogs(server, { NKikimrServices::PQ_WRITE_PROXY });\
-    TPQDataWriter writer(messageGroupId, grpc, client, server.GetRuntime());\
-    writer.WaitWritePQServiceInitialization();\
-    auto channel = grpc::CreateChannel("localhost:" + ToString(grpc), grpc::InsecureChannelCredentials());\
-    auto service = Ydb::PersQueue::V1::PersQueueService::NewStub(channel);\
-
-template<typename TStream, typename TMessage = google::protobuf::Message>
-void AssertSuccessfullStreamingOperation(bool ok, std::unique_ptr<TStream>& stream, TMessage* message = nullptr) {
-    if (!ok) {
-        auto status = stream->Finish();
-        TStringBuilder errorMessage;
-        errorMessage << "gRPC stream operation failed with error code " << static_cast<int>(status.error_code()) << " and error message '" << status.error_message() << "'.";
-        if (message != nullptr) {
-            errorMessage << " Last user message is " << message->DebugString();
-        }
-        UNIT_FAIL(errorMessage);
-    }
-}
-
-template<typename TClientMessage, typename TServerMessage>
-void AssertStreamingSessionAlive(std::unique_ptr<grpc::ClientReaderWriter<TClientMessage, TServerMessage>>& stream) {
-    TClientMessage clientMessage;
-    // TODO: Add 'ping_request' and 'ping_response' to write and read protocol for debugging?
-    clientMessage.mutable_update_token_request();
-    AssertSuccessfullStreamingOperation(stream->Write(clientMessage), stream, &clientMessage);
-    TServerMessage serverMessage;
-    AssertSuccessfullStreamingOperation(stream->Read(&serverMessage), stream);
-    UNIT_ASSERT_EQUAL_C(TServerMessage::kUpdateTokenResponse, serverMessage.server_message_case(), serverMessage);
-}
-
-template<typename TClientMessage, typename TServerMessage>
-void AssertStreamingSessionDead(std::unique_ptr<grpc::ClientReaderWriter<TClientMessage, TServerMessage>>& stream,
-    const Ydb::StatusIds::StatusCode expectedStatus, const Ydb::PersQueue::ErrorCode::ErrorCode expectedErrorCode)
-{
-    TServerMessage serverMessage;
-    AssertSuccessfullStreamingOperation(stream->Read(&serverMessage), stream);
-    UNIT_ASSERT_VALUES_EQUAL(expectedStatus, serverMessage.status());
-    UNIT_ASSERT_LE(1, serverMessage.issues_size());
-    // TODO: Why namespace duplicates enum name "ErrorCode::ErrorCode"?
-    // TODO: Why "Ydb::PersQueue::ErrorCode::ErrorCode" doesn't work with streaming output like "Ydb::StatusIds::StatusCode" does?
-    auto actualErrorCode = static_cast<Ydb::PersQueue::ErrorCode::ErrorCode>(serverMessage.issues(0).issue_code());
-    UNIT_ASSERT_C(expectedErrorCode == actualErrorCode, serverMessage);
-}
+    client.CreateTopic("rt3.dc1--" + TString(topic), 1);\ 
+    EnableLogs(server, { NKikimrServices::PQ_WRITE_PROXY });\ 
+    TPQDataWriter writer(messageGroupId, grpc, client, server.GetRuntime());\ 
+    writer.WaitWritePQServiceInitialization();\ 
+    auto channel = grpc::CreateChannel("localhost:" + ToString(grpc), grpc::InsecureChannelCredentials());\ 
+    auto service = Ydb::PersQueue::V1::PersQueueService::NewStub(channel);\ 
+ 
+template<typename TStream, typename TMessage = google::protobuf::Message> 
+void AssertSuccessfullStreamingOperation(bool ok, std::unique_ptr<TStream>& stream, TMessage* message = nullptr) { 
+    if (!ok) { 
+        auto status = stream->Finish(); 
+        TStringBuilder errorMessage; 
+        errorMessage << "gRPC stream operation failed with error code " << static_cast<int>(status.error_code()) << " and error message '" << status.error_message() << "'."; 
+        if (message != nullptr) { 
+            errorMessage << " Last user message is " << message->DebugString(); 
+        } 
+        UNIT_FAIL(errorMessage); 
+    } 
+} 
+ 
+template<typename TClientMessage, typename TServerMessage> 
+void AssertStreamingSessionAlive(std::unique_ptr<grpc::ClientReaderWriter<TClientMessage, TServerMessage>>& stream) { 
+    TClientMessage clientMessage; 
+    // TODO: Add 'ping_request' and 'ping_response' to write and read protocol for debugging? 
+    clientMessage.mutable_update_token_request(); 
+    AssertSuccessfullStreamingOperation(stream->Write(clientMessage), stream, &clientMessage); 
+    TServerMessage serverMessage; 
+    AssertSuccessfullStreamingOperation(stream->Read(&serverMessage), stream); 
+    UNIT_ASSERT_EQUAL_C(TServerMessage::kUpdateTokenResponse, serverMessage.server_message_case(), serverMessage); 
+} 
+ 
+template<typename TClientMessage, typename TServerMessage> 
+void AssertStreamingSessionDead(std::unique_ptr<grpc::ClientReaderWriter<TClientMessage, TServerMessage>>& stream, 
+    const Ydb::StatusIds::StatusCode expectedStatus, const Ydb::PersQueue::ErrorCode::ErrorCode expectedErrorCode) 
+{ 
+    TServerMessage serverMessage; 
+    AssertSuccessfullStreamingOperation(stream->Read(&serverMessage), stream); 
+    UNIT_ASSERT_VALUES_EQUAL(expectedStatus, serverMessage.status()); 
+    UNIT_ASSERT_LE(1, serverMessage.issues_size()); 
+    // TODO: Why namespace duplicates enum name "ErrorCode::ErrorCode"? 
+    // TODO: Why "Ydb::PersQueue::ErrorCode::ErrorCode" doesn't work with streaming output like "Ydb::StatusIds::StatusCode" does? 
+    auto actualErrorCode = static_cast<Ydb::PersQueue::ErrorCode::ErrorCode>(serverMessage.issues(0).issue_code()); 
+    UNIT_ASSERT_C(expectedErrorCode == actualErrorCode, serverMessage); 
+}