Make chunk replicas cache slimmer

commit_hash:454430a5c94d0dbe31ac1157f5490cc6c834fcc0

3 files changed, 8 insertions, 6 deletions

diff --git a/yt/yt/client/chunk_client/chunk_replica.cpp b/yt/yt/client/chunk_client/chunk_replica.cpp
index 41e43d299f..f2a6aa00cf 100644
--- a/yt/yt/client/chunk_client/chunk_replica.cpp
+++ b/yt/yt/client/chunk_client/chunk_replica.cpp
@@ -173,7 +173,7 @@ void TChunkReplicaAddressFormatter::operator()(TStringBuilderBase* builder, TChu
 
 ////////////////////////////////////////////////////////////////////////////////
 
-TChunkReplicaList TChunkReplicaWithMedium::ToChunkReplicas(const TChunkReplicaWithMediumList& replicasWithMedia)
+TChunkReplicaList TChunkReplicaWithMedium::ToChunkReplicas(TRange<TChunkReplicaWithMedium> replicasWithMedia)
 {
     TChunkReplicaList replicas;
     replicas.reserve(replicasWithMedia.size());
diff --git a/yt/yt/client/chunk_client/chunk_replica.h b/yt/yt/client/chunk_client/chunk_replica.h
index 3aac24c6da..8d6a29f061 100644
--- a/yt/yt/client/chunk_client/chunk_replica.h
+++ b/yt/yt/client/chunk_client/chunk_replica.h
@@ -37,7 +37,7 @@ public:
     int GetMediumIndex() const;
 
     TChunkReplica ToChunkReplica() const;
-    static TChunkReplicaList ToChunkReplicas(const TChunkReplicaWithMediumList& replicasWithMedia);
+    static TChunkReplicaList ToChunkReplicas(TRange<TChunkReplicaWithMedium> replicasWithMedia);
 
 private:
     /*!
diff --git a/yt/yt/client/chunk_client/public.h b/yt/yt/client/chunk_client/public.h
index 4e4f5c8edc..bf95fbc3ab 100644
--- a/yt/yt/client/chunk_client/public.h
+++ b/yt/yt/client/chunk_client/public.h
@@ -125,12 +125,13 @@ using TMediumMap = THashMap<int, T>;
 template <typename T>
 using TCompactMediumMap = TCompactFlatMap<int, T, 4>;
 
+constexpr int UpperReplicaCountBound = 24;
 //! Used as an expected upper bound in TCompactVector.
 /*
  *  Maximum regular number of replicas is 16 (for LRC codec).
  *  Additional +8 enables some flexibility during balancing.
  */
-constexpr int TypicalReplicaCount = 24;
+constexpr int TypicalReplicaCount = 3;
 constexpr int GenericChunkReplicaIndex = 16;  // no specific replica; the default one for non-erasure chunks
 
 //! Valid indexes are in range |[0, ChunkReplicaIndexBound)|.
@@ -145,15 +146,16 @@ constexpr int DefaultSlotsMediumIndex =   0;
 constexpr int MediumIndexBound = AllMediaIndex + 1;
 
 class TChunkReplicaWithMedium;
-using TChunkReplicaWithMediumList = TCompactVector<TChunkReplicaWithMedium, TypicalReplicaCount>;
+using TChunkReplicaWithMediumList = TCompactVector<TChunkReplicaWithMedium, UpperReplicaCountBound>;
+using TChunkReplicaWithMediumSlimList = TCompactVector<TChunkReplicaWithMedium, TypicalReplicaCount>;
 
 class TChunkReplicaWithLocation;
-using TChunkReplicaWithLocationList = TCompactVector<TChunkReplicaWithLocation, TypicalReplicaCount>;
+using TChunkReplicaWithLocationList = TCompactVector<TChunkReplicaWithLocation, UpperReplicaCountBound>;
 
 struct TWrittenChunkReplicasInfo;
 
 class TChunkReplica;
-using TChunkReplicaList = TCompactVector<TChunkReplica, TypicalReplicaCount>;
+using TChunkReplicaList = TCompactVector<TChunkReplica, UpperReplicaCountBound>;
 
 extern const TString DefaultStoreAccountName;
 extern const TString DefaultStoreMediumName;