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#include "pq_l2_cache.h"
#include <ydb/core/mon/mon.h>
namespace NKikimr {
namespace NPQ {
IActor* CreateNodePersQueueL2Cache(const TCacheL2Parameters& params, TIntrusivePtr<NMonitoring::TDynamicCounters> counters)
{
return new TPersQueueCacheL2(params, counters);
}
void TPersQueueCacheL2::Bootstrap(const TActorContext& ctx)
{
TAppData * appData = AppData(ctx);
Y_VERIFY(appData);
auto mon = appData->Mon;
if (mon) {
NMonitoring::TIndexMonPage * page = mon->RegisterIndexPage("actors", "Actors");
mon->RegisterActorPage(page, "pql2", "PersQueue Node Cache", false, ctx.ExecutorThread.ActorSystem, ctx.SelfID);
}
Become(&TThis::StateFunc);
}
void TPersQueueCacheL2::Handle(TEvPqCache::TEvCacheL2Request::TPtr& ev, const TActorContext& ctx)
{
THolder<TCacheL2Request> request(ev->Get()->Data.Release());
TString topicName = request->TopicName;
Y_VERIFY(topicName.size(), "PQ L2. Empty topic name in L2");
TouchBlobs(ctx, topicName, request->RequestedBlobs);
TouchBlobs(ctx, topicName, request->ExpectedBlobs, false);
RemoveBlobs(ctx, topicName, request->RemovedBlobs);
RegretBlobs(ctx, topicName, request->MissedBlobs);
THashMap<TKey, TCacheValue::TPtr> evicted;
AddBlobs(ctx, topicName, request->StoredBlobs, evicted);
SendResponses(ctx, evicted);
}
void TPersQueueCacheL2::SendResponses(const TActorContext& ctx, const THashMap<TKey, TCacheValue::TPtr>& evictedBlobs)
{
TInstant now = TAppData::TimeProvider->Now();
THashMap<TActorId, THolder<TCacheL2Response>> responses;
for (auto rm : evictedBlobs) {
const TKey& key = rm.first;
TCacheValue::TPtr evicted = rm.second;
THolder<TCacheL2Response>& resp = responses[evicted->GetOwner()];
if (!resp) {
resp = MakeHolder<TCacheL2Response>();
resp->TopicName = key.TopicName;
}
Y_VERIFY(key.TopicName == resp->TopicName, "PQ L2. Multiple topics in one PQ tablet.");
resp->Removed.push_back({key.Partition, key.Offset, key.PartNo, evicted});
RetentionTime = now - evicted->GetAccessTime();
if (RetentionTime < KeepTime)
resp->Overload = true;
}
for (auto& resp : responses)
ctx.Send(resp.first, new TEvPqCache::TEvCacheL2Response(resp.second.Release()));
{ // counters
(*Counters.Retention) = RetentionTime.Seconds();
}
}
/// @return outRemoved - map of evicted items. L1 should be noticed about them
void TPersQueueCacheL2::AddBlobs(const TActorContext& ctx, TString topic, const TVector<TCacheBlobL2>& blobs,
THashMap<TKey, TCacheValue::TPtr>& outEvicted)
{
ui32 numUnused = 0;
for (const TCacheBlobL2& blob : blobs) {
Y_VERIFY(blob.Value->DataSize(), "Trying to place empty blob into L2 cache");
TKey key(topic, blob);
// PQ tablet could send some data twice (if it's restored after die)
if (Cache.FindWithoutPromote(key) != Cache.End()) {
LOG_WARN_S(ctx, NKikimrServices::PERSQUEUE, "PQ Cache (L2). Same blob insertion. Topic '" << topic
<< "' partition " << key.Partition << " offset " << key.Offset << " size " << blob.Value->DataSize());
continue;
}
Y_VERIFY(CurrentSize <= Cache.Size() * MAX_BLOB_SIZE);
CurrentSize += blob.Value->DataSize();
// manualy manage LRU size
while (CurrentSize > MaxSize) {
auto oldest = Cache.FindOldest();
Y_VERIFY(oldest != Cache.End(), "Topic '%s' count %" PRIu64 " size %" PRIu64
" maxSize %" PRIu64 " blobSize %" PRIu64 " blobs %" PRIu64 " evicted %" PRIu64,
topic.data(), Cache.Size(), CurrentSize, MaxSize, blob.Value->DataSize(), blobs.size(), outEvicted.size());
TCacheValue::TPtr value = oldest.Value();
outEvicted.insert({oldest.Key(), value});
if (value->GetAccessCount() == 0)
++numUnused;
LOG_DEBUG_S(ctx, NKikimrServices::PERSQUEUE, "PQ Cache (L2). Evicting blob. Topic '" << topic
<< "' partition " << oldest.Key().Partition << " offset " << oldest.Key().Offset << " size " << value->DataSize());
CurrentSize -= value->DataSize();
Cache.Erase(oldest);
}
LOG_DEBUG_S(ctx, NKikimrServices::PERSQUEUE, "PQ Cache (L2). Adding blob. Topic '" << topic
<< "' partition " << blob.Partition << " offset " << blob.Offset << " size " << blob.Value->DataSize());
Cache.Insert(key, blob.Value);
}
{ // counters
(*Counters.TotalSize) = CurrentSize;
(*Counters.TotalCount) = Cache.Size();
(*Counters.Evictions) += outEvicted.size();
(*Counters.Unused) += numUnused;
(*Counters.Used) += outEvicted.size() - numUnused;
}
}
void TPersQueueCacheL2::RemoveBlobs(const TActorContext& ctx, TString topic, const TVector<TCacheBlobL2>& blobs)
{
ui32 numEvicted = 0;
ui32 numUnused = 0;
for (const TCacheBlobL2& blob : blobs) {
TKey key(topic, blob);
auto it = Cache.FindWithoutPromote(key);
if (it != Cache.End()) {
CurrentSize -= (*it)->DataSize();
numEvicted++;
if ((*it)->GetAccessCount() == 0)
++numUnused;
Cache.Erase(it);
LOG_DEBUG_S(ctx, NKikimrServices::PERSQUEUE, "PQ Cache (L2). Removed. Topic '" << topic
<< "' partition " << blob.Partition << " offset " << blob.Offset);
} else {
LOG_DEBUG_S(ctx, NKikimrServices::PERSQUEUE, "PQ Cache (L2). Miss in remove. Topic '" << topic
<< "' partition " << blob.Partition << " offset " << blob.Offset);
}
}
{ // counters
(*Counters.TotalSize) = CurrentSize;
(*Counters.TotalCount) = Cache.Size();
(*Counters.Evictions) += numEvicted;
(*Counters.Unused) += numUnused;
(*Counters.Used) += numEvicted - numUnused;
}
}
void TPersQueueCacheL2::TouchBlobs(const TActorContext& ctx, TString topic, const TVector<TCacheBlobL2>& blobs, bool isHit)
{
TInstant now = TAppData::TimeProvider->Now();
for (const TCacheBlobL2& blob : blobs) {
TKey key(topic, blob);
auto it = Cache.Find(key);
if (it != Cache.End()) {
(*it)->Touch(now);
LOG_DEBUG_S(ctx, NKikimrServices::PERSQUEUE, "PQ Cache (L2). Touched. Topic '" << topic
<< "' partition " << blob.Partition << " offset " << blob.Offset);
} else {
LOG_DEBUG_S(ctx, NKikimrServices::PERSQUEUE, "PQ Cache (L2). Miss in touch. Topic '" << topic
<< "' partition " << blob.Partition << " offset " << blob.Offset);
}
}
{ // counters
(*Counters.Touches) += blobs.size();
if (isHit)
(*Counters.Hits) += blobs.size();
auto oldest = Cache.FindOldest();
if (oldest != Cache.End())
RetentionTime = now - oldest.Value()->GetAccessTime();
}
}
void TPersQueueCacheL2::RegretBlobs(const TActorContext& ctx, TString topic, const TVector<TCacheBlobL2>& blobs)
{
for (const TCacheBlobL2& blob : blobs) {
LOG_DEBUG_S(ctx, NKikimrServices::PERSQUEUE, "PQ Cache (L2). Missed blob. Topic '" << topic
<< "' partition " << blob.Partition << " offset " << blob.Offset);
}
{ // counters
(*Counters.Misses) += blobs.size();
}
}
void TPersQueueCacheL2::Handle(NMon::TEvHttpInfo::TPtr& ev, const TActorContext& ctx)
{
const auto& params = ev->Get()->Request.GetParams();
if (params.Has("submit")) {
TString strParam = params.Get("newCacheLimit");
if (strParam.size()) {
ui32 valueMb = atoll(strParam.data());
MaxSize = SizeInBytes(valueMb); // will be applyed at next AddBlobs
}
}
TString html = HttpForm();
ctx.Send(ev->Sender, new NMon::TEvHttpInfoRes(html));
}
TString TPersQueueCacheL2::HttpForm() const
{
TStringStream str;
HTML(str) {
FORM_CLASS("form-horizontal") {
DIV_CLASS("row") {
PRE() {
str << "CacheLimit (MB): " << (MaxSize>>20) << Endl;
str << "CacheSize (MB): " << (CurrentSize>>20) << Endl;
str << "Count of blobs: " << Cache.Size() << Endl;
str << "Min RetentionTime: " << KeepTime << Endl;
str << "RetentionTime: " << RetentionTime << Endl;
}
}
DIV_CLASS("control-group") {
LABEL_CLASS_FOR("control-label", "inputTo") {str << "New Chache Limit";}
DIV_CLASS("controls") {
str << "<input type=\"number\" id=\"inputTo\" placeholder=\"CacheLimit (MB)\" name=\"newCacheLimit\">";
}
}
DIV_CLASS("control-group") {
DIV_CLASS("controls") {
str << "<button type=\"submit\" name=\"submit\" class=\"btn btn-primary\">Change</button>";
}
}
}
}
return str.Str();
}
} // NPQ
} // NKikimr
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