fix states usage for accessors request filling (ydb-platform#12553)

iddqdex · Dec 19, 2024 · b870df9 · b870df9
1 parent 16418df
commit b870df9
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Showing 22 changed files with 109 additions and 46 deletions.
diff --git a/ydb/core/tx/columnshard/columnshard__statistics.cpp b/ydb/core/tx/columnshard/columnshard__statistics.cpp
@@ -179,7 +179,7 @@ class TColumnPortionsAccumulator {
             return;
         }
         Result->AddWaitingTask();
-        std::shared_ptr<NOlap::TDataAccessorsRequest> request = std::make_shared<NOlap::TDataAccessorsRequest>();
+        std::shared_ptr<NOlap::TDataAccessorsRequest> request = std::make_shared<NOlap::TDataAccessorsRequest>("STATISTICS_FLUSH");
         for (auto&& i : Portions) {
             request->AddPortion(i);
         }
@@ -227,7 +227,7 @@ void TColumnShard::Handle(NStat::TEvStatistics::TEvStatisticsRequest::TPtr& ev,
         columnTagsRequested = std::set<ui32>(allColumnIds.begin(), allColumnIds.end());
     }
 
-    NOlap::TDataAccessorsRequest request;
+    NOlap::TDataAccessorsRequest request("STATISTICS");
     std::shared_ptr<TResultAccumulator> resultAccumulator =
         std::make_shared<TResultAccumulator>(columnTagsRequested, ev->Sender, ev->Cookie, std::move(response));
     auto versionedIndex = std::make_shared<NOlap::TVersionedIndex>(index.GetVersionedIndex());

diff --git a/ydb/core/tx/columnshard/columnshard_impl.cpp b/ydb/core/tx/columnshard/columnshard_impl.cpp
@@ -1405,12 +1405,15 @@ class TTxAskPortionChunks: public TTransactionBase<TColumnShard> {
     std::shared_ptr<NOlap::NDataAccessorControl::IAccessorCallback> FetchCallback;
     THashMap<ui64, std::vector<NOlap::TPortionInfo::TConstPtr>> PortionsByPath;
     std::vector<TPortionConstructorV2> FetchedAccessors;
+    const TString Consumer;
 
 public:
     TTxAskPortionChunks(TColumnShard* self, const std::shared_ptr<NOlap::NDataAccessorControl::IAccessorCallback>& fetchCallback,
-        THashMap<ui64, NOlap::TPortionInfo::TConstPtr>&& portions)
+        THashMap<ui64, NOlap::TPortionInfo::TConstPtr>&& portions, const TString& consumer)
         : TBase(self)
-        , FetchCallback(fetchCallback) {
+        , FetchCallback(fetchCallback)
+        , Consumer(consumer)
+    {
         for (auto&& i : portions) {
             PortionsByPath[i.second->GetPathId()].emplace_back(i.second);
         }
@@ -1421,8 +1424,9 @@ class TTxAskPortionChunks: public TTransactionBase<TColumnShard> {
 
         TBlobGroupSelector selector(Self->Info());
         bool reask = false;
+        NActors::TLogContextGuard lGuard = NActors::TLogContextBuilder::Build()("consumer", Consumer)("event", "TTxAskPortionChunks::Execute");
         for (auto&& i : PortionsByPath) {
-            AFL_INFO(NKikimrServices::TX_COLUMNSHARD)("event", "TTxAskPortionChunks::Execute")("size", i.second.size())("path_id", i.first);
+            AFL_INFO(NKikimrServices::TX_COLUMNSHARD)("size", i.second.size())("path_id", i.first);
             for (auto&& p : i.second) {
                 if (!p->GetSchema(Self->GetIndexAs<NOlap::TColumnEngineForLogs>().GetVersionedIndex())->GetIndexesCount()) {
                     continue;
@@ -1440,7 +1444,8 @@ class TTxAskPortionChunks: public TTransactionBase<TColumnShard> {
         }
 
         for (auto&& i : PortionsByPath) {
-            AFL_INFO(NKikimrServices::TX_COLUMNSHARD)("event", "TTxAskPortionChunks::Execute")("stage", "processing")("size", i.second.size())("path_id", i.first);
+            AFL_INFO(NKikimrServices::TX_COLUMNSHARD)("stage", "processing")("size", i.second.size())(
+                "path_id", i.first);
             while (i.second.size()) {
                 auto p = i.second.back();
                 TPortionConstructorV2 constructor(p);
@@ -1470,11 +1475,11 @@ class TTxAskPortionChunks: public TTransactionBase<TColumnShard> {
                 FetchedAccessors.emplace_back(std::move(constructor));
                 i.second.pop_back();
             }
-            AFL_INFO(NKikimrServices::TX_COLUMNSHARD)("event", "TTxAskPortionChunks::Execute")("stage", "finished")("size", i.second.size())(
+            AFL_INFO(NKikimrServices::TX_COLUMNSHARD)("stage", "finished")("size", i.second.size())(
                 "path_id", i.first);
         }
 
-        AFL_INFO(NKikimrServices::TX_COLUMNSHARD)("event", "TTxAskPortionChunks::Execute")("stage", "finished");
+        AFL_INFO(NKikimrServices::TX_COLUMNSHARD)("stage", "finished");
         NConveyor::TInsertServiceOperator::AsyncTaskToExecute(std::make_shared<TAccessorsParsingTask>(FetchCallback, std::move(FetchedAccessors)));
         return true;
     }
@@ -1486,7 +1491,7 @@ class TTxAskPortionChunks: public TTransactionBase<TColumnShard> {
 };
 
 void TColumnShard::Handle(NOlap::NDataAccessorControl::TEvAskTabletDataAccessors::TPtr& ev, const TActorContext& /*ctx*/) {
-    Execute(new TTxAskPortionChunks(this, ev->Get()->GetCallback(), std::move(ev->Get()->MutablePortions())));
+    Execute(new TTxAskPortionChunks(this, ev->Get()->GetCallback(), std::move(ev->Get()->MutablePortions()), ev->Get()->GetConsumer()));
 }
 
 void TColumnShard::Handle(NOlap::NDataSharing::NEvents::TEvAckFinishFromInitiator::TPtr& ev, const TActorContext& ctx) {

diff --git a/ydb/core/tx/columnshard/data_accessor/abstract/collector.cpp b/ydb/core/tx/columnshard/data_accessor/abstract/collector.cpp
@@ -6,9 +6,9 @@
 namespace NKikimr::NOlap::NDataAccessorControl {
 
 THashMap<ui64, TPortionDataAccessor> IGranuleDataAccessor::AskData(
-    const std::vector<TPortionInfo::TConstPtr>& portions, const std::shared_ptr<IAccessorCallback>& callback) {
+    const std::vector<TPortionInfo::TConstPtr>& portions, const std::shared_ptr<IAccessorCallback>& callback, const TString& consumer) {
     AFL_VERIFY(portions.size());
-    return DoAskData(portions, callback);
+    return DoAskData(portions, callback, consumer);
 }
 
 void TActorAccessorsCallback::OnAccessorsFetched(std::vector<TPortionDataAccessor>&& accessors) {

diff --git a/ydb/core/tx/columnshard/data_accessor/abstract/collector.h b/ydb/core/tx/columnshard/data_accessor/abstract/collector.h
@@ -25,7 +25,7 @@ class IGranuleDataAccessor {
     const ui64 PathId;
 
     virtual THashMap<ui64, TPortionDataAccessor> DoAskData(
-        const std::vector<TPortionInfo::TConstPtr>& portions, const std::shared_ptr<IAccessorCallback>& callback) = 0;
+        const std::vector<TPortionInfo::TConstPtr>& portions, const std::shared_ptr<IAccessorCallback>& callback, const TString& consumer) = 0;
     virtual void DoModifyPortions(const std::vector<TPortionDataAccessor>& add, const std::vector<ui64>& remove) = 0;
 
 public:
@@ -39,7 +39,8 @@ class IGranuleDataAccessor {
         : PathId(pathId) {
     }
 
-    THashMap<ui64, TPortionDataAccessor> AskData(const std::vector<TPortionInfo::TConstPtr>& portions, const std::shared_ptr<IAccessorCallback>& callback);
+    THashMap<ui64, TPortionDataAccessor> AskData(
+        const std::vector<TPortionInfo::TConstPtr>& portions, const std::shared_ptr<IAccessorCallback>& callback, const TString& consumer);
     void ModifyPortions(const std::vector<TPortionDataAccessor>& add, const std::vector<ui64>& remove) {
         return DoModifyPortions(add, remove);
     }

diff --git a/ydb/core/tx/columnshard/data_accessor/events.h b/ydb/core/tx/columnshard/data_accessor/events.h
@@ -80,12 +80,14 @@ class TEvAskTabletDataAccessors: public NActors::TEventLocal<TEvAskTabletDataAcc
     using TPortions = THashMap<ui64, TPortionInfo::TConstPtr>;
     YDB_ACCESSOR_DEF(TPortions, Portions);
     YDB_READONLY_DEF(std::shared_ptr<NDataAccessorControl::IAccessorCallback>, Callback);
+    YDB_READONLY_DEF(TString, Consumer);
 
 public:
-    explicit TEvAskTabletDataAccessors(
-        const THashMap<ui64, TPortionInfo::TConstPtr>& portions, const std::shared_ptr<NDataAccessorControl::IAccessorCallback>& callback)
+    explicit TEvAskTabletDataAccessors(const THashMap<ui64, TPortionInfo::TConstPtr>& portions,
+        const std::shared_ptr<NDataAccessorControl::IAccessorCallback>& callback, const TString& consumer)
         : Portions(portions)
-        , Callback(callback) {
+        , Callback(callback)
+        , Consumer(consumer) {
     }
 };
 

diff --git a/ydb/core/tx/columnshard/data_accessor/in_mem/collector.cpp b/ydb/core/tx/columnshard/data_accessor/in_mem/collector.cpp
@@ -3,7 +3,7 @@
 namespace NKikimr::NOlap::NDataAccessorControl::NInMem {
 
 THashMap<ui64, TPortionDataAccessor> TCollector::DoAskData(
-    const std::vector<TPortionInfo::TConstPtr>& portions, const std::shared_ptr<IAccessorCallback>& /*callback*/) {
+    const std::vector<TPortionInfo::TConstPtr>& portions, const std::shared_ptr<IAccessorCallback>& /*callback*/, const TString& /*consumer*/) {
     THashMap<ui64, TPortionDataAccessor> accessors;
     for (auto&& i : portions) {
         auto it = Accessors.find(i->GetPortionId());

diff --git a/ydb/core/tx/columnshard/data_accessor/in_mem/collector.h b/ydb/core/tx/columnshard/data_accessor/in_mem/collector.h
@@ -7,7 +7,7 @@ class TCollector: public IGranuleDataAccessor {
     using TBase = IGranuleDataAccessor;
     THashMap<ui64, TPortionDataAccessor> Accessors;
     virtual THashMap<ui64, TPortionDataAccessor> DoAskData(
-        const std::vector<TPortionInfo::TConstPtr>& portions, const std::shared_ptr<IAccessorCallback>& callback) override;
+        const std::vector<TPortionInfo::TConstPtr>& portions, const std::shared_ptr<IAccessorCallback>& callback, const TString& consumer) override;
     virtual void DoModifyPortions(const std::vector<TPortionDataAccessor>& add,
         const std::vector<ui64>& remove) override;
 

diff --git a/ydb/core/tx/columnshard/data_accessor/local_db/collector.cpp b/ydb/core/tx/columnshard/data_accessor/local_db/collector.cpp
@@ -4,7 +4,7 @@
 namespace NKikimr::NOlap::NDataAccessorControl::NLocalDB {
 
 THashMap<ui64, TPortionDataAccessor> TCollector::DoAskData(
-    const std::vector<TPortionInfo::TConstPtr>& portions, const std::shared_ptr<IAccessorCallback>& callback) {
+    const std::vector<TPortionInfo::TConstPtr>& portions, const std::shared_ptr<IAccessorCallback>& callback, const TString& consumer) {
     THashMap<ui64, TPortionDataAccessor> accessors;
     THashMap<ui64, TPortionInfo::TConstPtr> portionsToDirectAsk;
     for (auto&& p : portions) {
@@ -17,7 +17,7 @@ THashMap<ui64, TPortionDataAccessor> TCollector::DoAskData(
     }
     if (portionsToDirectAsk.size()) {
         NActors::TActivationContext::Send(
-            TabletActorId, std::make_unique<NDataAccessorControl::TEvAskTabletDataAccessors>(portionsToDirectAsk, callback));
+            TabletActorId, std::make_unique<NDataAccessorControl::TEvAskTabletDataAccessors>(portionsToDirectAsk, callback, consumer));
     }
     return accessors;
 }

diff --git a/ydb/core/tx/columnshard/data_accessor/local_db/collector.h b/ydb/core/tx/columnshard/data_accessor/local_db/collector.h
@@ -17,8 +17,8 @@ class TCollector: public IGranuleDataAccessor {
 
     TLRUCache<ui64, TPortionDataAccessor, TNoopDelete, TMetadataSizeProvider> AccessorsCache;
     using TBase = IGranuleDataAccessor;
-    virtual THashMap<ui64, TPortionDataAccessor> DoAskData(
-        const std::vector<TPortionInfo::TConstPtr>& portions, const std::shared_ptr<IAccessorCallback>& callback) override;
+    virtual THashMap<ui64, TPortionDataAccessor> DoAskData(const std::vector<TPortionInfo::TConstPtr>& portions,
+        const std::shared_ptr<IAccessorCallback>& callback, const TString& consumer) override;
     virtual void DoModifyPortions(const std::vector<TPortionDataAccessor>& add, const std::vector<ui64>& remove) override;
 
 public:

diff --git a/ydb/core/tx/columnshard/data_accessor/manager.h b/ydb/core/tx/columnshard/data_accessor/manager.h
@@ -115,7 +115,7 @@ class TLocalManager: public IDataAccessorsManager {
                 if (portionsAsk.empty()) {
                     continue;
                 }
-                auto accessors = it->second->AskData(portionsAsk, AccessorCallback);
+                auto accessors = it->second->AskData(portionsAsk, AccessorCallback, request->GetConsumer());
                 for (auto&& p : portionsAsk) {
                     auto itAccessor = accessors.find(p->GetPortionId());
                     if (itAccessor == accessors.end()) {

diff --git a/ydb/core/tx/columnshard/data_accessor/request.h b/ydb/core/tx/columnshard/data_accessor/request.h
@@ -169,6 +169,7 @@ class TDataAccessorsRequest: public NColumnShard::TMonitoringObjectsCounter<TDat
     static inline TAtomicCounter Counter = 0;
     ui32 FetchStage = 0;
     YDB_READONLY(ui64, RequestId, Counter.Inc());
+    YDB_READONLY_DEF(TString, Consumer);
     THashSet<ui64> PortionIds;
     THashMap<ui64, TPathFetchingState> PathIdStatus;
     THashSet<ui64> PathIds;
@@ -208,7 +209,11 @@ class TDataAccessorsRequest: public NColumnShard::TMonitoringObjectsCounter<TDat
         return sb;
     }
 
-    TDataAccessorsRequest() = default;
+    TDataAccessorsRequest(const TString& consumer)
+        : Consumer(consumer)
+    {
+
+    }
 
     ui64 PredictAccessorsMemory(const ISnapshotSchema::TPtr& schema) const {
         ui64 result = 0;
@@ -276,7 +281,8 @@ class TDataAccessorsRequest: public NColumnShard::TMonitoringObjectsCounter<TDat
     }
 
     void AddError(const ui64 pathId, const TString& errorMessage) {
-        AFL_VERIFY(FetchStage == 1);
+        AFL_ERROR(NKikimrServices::TX_COLUMNSHARD)("error", errorMessage)("event", "ErrorOnFetching")("path_id", pathId);
+        AFL_VERIFY(FetchStage <= 1);
         auto itStatus = PathIdStatus.find(pathId);
         AFL_VERIFY(itStatus != PathIdStatus.end());
         itStatus->second.OnError(errorMessage);

diff --git a/ydb/core/tx/columnshard/data_locks/locks/composite.h b/ydb/core/tx/columnshard/data_locks/locks/composite.h
@@ -35,6 +35,20 @@ class TCompositeLock: public ILock {
         return Locks.empty();
     }
 public:
+    static std::shared_ptr<ILock> Build(const TString& lockName, const std::initializer_list<std::shared_ptr<ILock>>& locks) {
+        std::vector<std::shared_ptr<ILock>> locksUseful;
+        for (auto&& i : locks) {
+            if (i && !i->IsEmpty()) {
+                locksUseful.emplace_back(i);
+            }
+        }
+        if (locksUseful.size() == 1) {
+            return locksUseful.front();
+        } else {
+            return std::make_shared<TCompositeLock>(lockName, locksUseful);
+        }
+    }
+
     TCompositeLock(const TString& lockName, const std::vector<std::shared_ptr<ILock>>& locks,
         const ELockCategory category = NDataLocks::ELockCategory::Any, const bool readOnly = false)
         : TBase(lockName, category, readOnly)

diff --git a/ydb/core/tx/columnshard/engines/changes/abstract/abstract.h b/ydb/core/tx/columnshard/engines/changes/abstract/abstract.h
@@ -242,7 +242,7 @@ class TColumnEngineChanges {
         return DoBuildDataLock();
     }
 
-    std::shared_ptr<TDataAccessorsRequest> PortionsToAccess = std::make_shared<TDataAccessorsRequest>();
+    std::shared_ptr<TDataAccessorsRequest> PortionsToAccess = std::make_shared<TDataAccessorsRequest>(TaskIdentifier);
     virtual void OnDataAccessorsInitialized(const TDataAccessorsInitializationContext& context) = 0;
 
 public:

diff --git a/ydb/core/tx/columnshard/engines/changes/cleanup_portions.cpp b/ydb/core/tx/columnshard/engines/changes/cleanup_portions.cpp
@@ -22,6 +22,19 @@ void TCleanupPortionsColumnEngineChanges::DoWriteIndexOnExecute(NColumnShard::TC
     if (!self) {
         return;
     }
+    THashSet<ui64> usedPortionIds;
+    auto schemaPtr = context.EngineLogs.GetVersionedIndex().GetLastSchema();
+    for (auto&& i : PortionsToRemove) {
+        Y_ABORT_UNLESS(!i->HasRemoveSnapshot());
+        AFL_VERIFY(usedPortionIds.emplace(i->GetPortionId()).second)("portion_info", i->DebugString(true));
+        const auto pred = [&](TPortionInfo& portionCopy) {
+            portionCopy.SetRemoveSnapshot(context.Snapshot);
+        };
+        context.EngineLogs.GetGranuleVerified(i->GetPathId())
+            .ModifyPortionOnExecute(
+                context.DBWrapper, GetPortionDataAccessor(i->GetPortionId()), pred, schemaPtr->GetIndexInfo().GetPKFirstColumnId());
+    }
+
     THashMap<TString, THashSet<TUnifiedBlobId>> blobIdsByStorage;
     for (auto&& [_, p] : FetchedDataAccessors->GetPortions()) {
         p.RemoveFromDatabase(context.DBWrapper);
@@ -37,12 +50,32 @@ void TCleanupPortionsColumnEngineChanges::DoWriteIndexOnExecute(NColumnShard::TC
 }
 
 void TCleanupPortionsColumnEngineChanges::DoWriteIndexOnComplete(NColumnShard::TColumnShard* self, TWriteIndexCompleteContext& context) {
+    {
+        auto g = context.EngineLogs.GranulesStorage->GetStats()->StartPackModification();
+        for (auto&& i : PortionsToRemove) {
+            Y_ABORT_UNLESS(!i->HasRemoveSnapshot());
+            const auto pred = [&](const std::shared_ptr<TPortionInfo>& portion) {
+                portion->SetRemoveSnapshot(context.Snapshot);
+            };
+            context.EngineLogs.ModifyPortionOnComplete(i, pred);
+            context.EngineLogs.AddCleanupPortion(i);
+        }
+    }
     for (auto& portionInfo : PortionsToDrop) {
         if (!context.EngineLogs.ErasePortion(*portionInfo)) {
             AFL_WARN(NKikimrServices::TX_COLUMNSHARD)("event", "Cannot erase portion")("portion", portionInfo->DebugString());
         }
     }
     if (self) {
+        self->Counters.GetTabletCounters()->IncCounter(NColumnShard::COUNTER_PORTIONS_DEACTIVATED, PortionsToRemove.size());
+        for (auto& portionInfo : PortionsToRemove) {
+            self->Counters.GetTabletCounters()->IncCounter(NColumnShard::COUNTER_BLOBS_DEACTIVATED, portionInfo->GetBlobIdsCount());
+            for (auto& blobId : portionInfo->GetBlobIds()) {
+                self->Counters.GetTabletCounters()->IncCounter(NColumnShard::COUNTER_BYTES_DEACTIVATED, blobId.BlobSize());
+            }
+            self->Counters.GetTabletCounters()->IncCounter(NColumnShard::COUNTER_RAW_BYTES_DEACTIVATED, portionInfo->GetTotalRawBytes());
+        }
+
         self->Counters.GetTabletCounters()->IncCounter(NColumnShard::COUNTER_PORTIONS_ERASED, PortionsToDrop.size());
         for (auto&& p : PortionsToDrop) {
             self->Counters.GetTabletCounters()->OnDropPortionEvent(p->GetTotalRawBytes(), p->GetTotalBlobBytes(), p->GetRecordsCount());

diff --git a/ydb/core/tx/columnshard/engines/changes/cleanup_portions.h b/ydb/core/tx/columnshard/engines/changes/cleanup_portions.h
@@ -9,6 +9,7 @@ class TCleanupPortionsColumnEngineChanges: public TColumnEngineChanges,
     using TBase = TColumnEngineChanges;
     THashMap<TString, std::vector<std::shared_ptr<TPortionInfo>>> StoragePortions;
     std::vector<TPortionInfo::TConstPtr> PortionsToDrop;
+    std::vector<TPortionInfo::TConstPtr> PortionsToRemove;
     THashSet<ui64> TablesToDrop;
 
 protected:
@@ -37,16 +38,13 @@ class TCleanupPortionsColumnEngineChanges: public TColumnEngineChanges,
         return NDataLocks::ELockCategory::Cleanup;
     }
     virtual std::shared_ptr<NDataLocks::ILock> DoBuildDataLock() const override {
-        auto portionsLock = std::make_shared<NDataLocks::TListPortionsLock>(
-            TypeString() + "::PORTIONS::" + GetTaskIdentifier(), PortionsToDrop, NDataLocks::ELockCategory::Cleanup);
-        if (TablesToDrop.size()) {
-            auto tablesLock = std::make_shared<NDataLocks::TListTablesLock>(
-                TypeString() + "::TABLES::" + GetTaskIdentifier(), TablesToDrop, NDataLocks::ELockCategory::Tables);
-            return std::shared_ptr<NDataLocks::TCompositeLock>(
-                new NDataLocks::TCompositeLock(TypeString() + "::COMPOSITE::" + GetTaskIdentifier(), { portionsLock, tablesLock }));
-        } else {
-            return portionsLock;
-        }
+        auto portionsDropLock = std::make_shared<NDataLocks::TListPortionsLock>(
+            TypeString() + "::PORTIONS_DROP::" + GetTaskIdentifier(), PortionsToDrop, NDataLocks::ELockCategory::Cleanup);
+        auto portionsRemoveLock = std::make_shared<NDataLocks::TListPortionsLock>(
+            TypeString() + "::PORTIONS_REMOVE::" + GetTaskIdentifier(), PortionsToRemove, NDataLocks::ELockCategory::Compaction);
+        auto tablesLock = std::make_shared<NDataLocks::TListTablesLock>(
+            TypeString() + "::TABLES::" + GetTaskIdentifier(), TablesToDrop, NDataLocks::ELockCategory::Tables);
+        return NDataLocks::TCompositeLock::Build(TypeString() + "::COMPOSITE::" + GetTaskIdentifier(), {portionsDropLock, portionsRemoveLock, tablesLock});
     }
 
 public:
@@ -68,6 +66,10 @@ class TCleanupPortionsColumnEngineChanges: public TColumnEngineChanges,
         PortionsToAccess->AddPortion(portion);
     }
 
+    void AddPortionToRemove(const TPortionInfo::TConstPtr& portion) {
+        PortionsToRemove.emplace_back(portion);
+    }
+
     virtual ui32 GetWritePortionsCount() const override {
         return 0;
     }

diff --git a/ydb/core/tx/columnshard/engines/column_engine_logs.cpp b/ydb/core/tx/columnshard/engines/column_engine_logs.cpp
@@ -352,7 +352,7 @@ std::shared_ptr<TCleanupPortionsColumnEngineChanges> TColumnEngineForLogs::Start
                 limitExceeded = true;
                 break;
             }
-            changes->AddPortionToDrop(info);
+            changes->AddPortionToRemove(info);
             ++portionsFromDrop;
         }
         changes->AddTableToDrop(pathId);

diff --git a/ydb/core/tx/columnshard/engines/reader/plain_reader/iterator/source.cpp b/ydb/core/tx/columnshard/engines/reader/plain_reader/iterator/source.cpp
@@ -237,7 +237,7 @@ bool TPortionDataSource::DoStartFetchingAccessor(const std::shared_ptr<IDataSour
     AFL_VERIFY(!StageData->HasPortionAccessor());
     AFL_DEBUG(NKikimrServices::TX_COLUMNSHARD_SCAN)("event", step.GetName())("fetching_info", step.DebugString());
 
-    std::shared_ptr<TDataAccessorsRequest> request = std::make_shared<TDataAccessorsRequest>();
+    std::shared_ptr<TDataAccessorsRequest> request = std::make_shared<TDataAccessorsRequest>("PLAIN::" + step.GetName());
     request->AddPortion(Portion);
     request->RegisterSubscriber(std::make_shared<TPortionAccessorFetchingSubscriber>(step, sourcePtr));
     GetContext()->GetCommonContext()->GetDataAccessorsManager()->AskData(request);