Merge 7644cea into b2d56de

ydb/core/tx/columnshard/columnshard_impl.cpp

@@ -84,7 +84,8 @@ TColumnShard::TColumnShard(TTabletStorageInfo* info, const TActorId& tablet)
     , PeriodicWakeupActivationPeriod(NYDBTest::TControllers::GetColumnShardController()->GetPeriodicWakeupActivationPeriod())
     , StatsReportInterval(NYDBTest::TControllers::GetColumnShardController()->GetStatsReportInterval())
     , InFlightReadsTracker(StoragesManager, Counters.GetRequestsTracingCounters())
-    , TablesManager(StoragesManager, std::make_shared<NOlap::NDataAccessorControl::TLocalManager>(nullptr), info->TabletID)
+    , TablesManager(StoragesManager, std::make_shared<NOlap::NDataAccessorControl::TLocalManager>(nullptr),
+          std::make_shared<NOlap::TSchemaObjectsCache>(), info->TabletID)
     , Subscribers(std::make_shared<NSubscriber::TManager>(*this))
     , PipeClientCache(NTabletPipe::CreateBoundedClientCache(new NTabletPipe::TBoundedClientCacheConfig(), GetPipeClientConfig()))
     , InsertTable(std::make_unique<NOlap::TInsertTable>())
@@ -354,15 +355,13 @@ void TColumnShard::RunInit(const NKikimrTxColumnShard::TInitShard& proto, const
 
     NIceDb::TNiceDb db(txc.DB);
 
-    if (proto.HasOwnerPathId()) {
-        OwnerPathId = proto.GetOwnerPathId();
-        Schema::SaveSpecialValue(db, Schema::EValueIds::OwnerPathId, OwnerPathId);
-    }
+    AFL_VERIFY(proto.HasOwnerPathId());
+    OwnerPathId = proto.GetOwnerPathId();
+    Schema::SaveSpecialValue(db, Schema::EValueIds::OwnerPathId, OwnerPathId);
 
-    if (proto.HasOwnerPath()) {
-        OwnerPath = proto.GetOwnerPath();
-        Schema::SaveSpecialValue(db, Schema::EValueIds::OwnerPath, OwnerPath);
-    }
+    AFL_VERIFY(proto.HasOwnerPathId());
+    OwnerPath = proto.GetOwnerPath();
+    Schema::SaveSpecialValue(db, Schema::EValueIds::OwnerPath, OwnerPath);
 
     for (auto& createTable : proto.GetTables()) {
         RunEnsureTable(createTable, version, txc);

ydb/core/tx/columnshard/engines/changes/indexation.cpp

@@ -108,7 +108,7 @@ class TPathFieldsInfo {
         if (!Schemas.contains(data.GetSchemaVersion())) {
             Schemas.emplace(data.GetSchemaVersion(), blobSchema);
         }
-        auto columnIds = blobSchema->GetIndexInfo().GetColumnIds(false);
+        TColumnIdsView columnIds = blobSchema->GetIndexInfo().GetColumnIds(false);
         std::vector<ui32> filteredIds = data.GetMeta().GetSchemaSubset().Apply(columnIds.begin(), columnIds.end());
         if (data.GetMeta().GetModificationType() == NEvWrite::EModificationType::Delete) {
             filteredIds.emplace_back((ui32)IIndexInfo::ESpecialColumn::DELETE_FLAG);
@@ -247,7 +247,7 @@ TConclusionStatus TInsertColumnEngineChanges::DoConstructBlobs(TConstructionCont
         {
             const auto blobData = Blobs.Extract(IStoragesManager::DefaultStorageId, blobRange);
 
-            auto blobSchemaView = blobSchema->GetIndexInfo().ArrowSchema();
+            NArrow::TSchemaLiteView blobSchemaView = blobSchema->GetIndexInfo().ArrowSchema();
             auto batchSchema =
                 std::make_shared<arrow::Schema>(inserted.GetMeta().GetSchemaSubset().Apply(blobSchemaView.begin(), blobSchemaView.end()));
             batch = std::make_shared<NArrow::TGeneralContainer>(NArrow::DeserializeBatch(blobData, batchSchema));

ydb/core/tx/columnshard/engines/column_engine_logs.cpp

@@ -26,25 +26,27 @@
 
 namespace NKikimr::NOlap {
 
-TColumnEngineForLogs::TColumnEngineForLogs(const ui64 tabletId,
+TColumnEngineForLogs::TColumnEngineForLogs(const ui64 tabletId, const std::shared_ptr<TSchemaObjectsCache>& schemaCache,
     const std::shared_ptr<NDataAccessorControl::IDataAccessorsManager>& dataAccessorsManager,
     const std::shared_ptr<IStoragesManager>& storagesManager, const TSnapshot& snapshot, const TSchemaInitializationData& schema)
     : GranulesStorage(std::make_shared<TGranulesStorage>(SignalCounters, dataAccessorsManager, storagesManager))
     , DataAccessorsManager(dataAccessorsManager)
     , StoragesManager(storagesManager)
+    , SchemaObjectsCache(schemaCache)
     , TabletId(tabletId)
     , LastPortion(0)
     , LastGranule(0) {
     ActualizationController = std::make_shared<NActualizer::TController>();
     RegisterSchemaVersion(snapshot, schema);
 }
 
-TColumnEngineForLogs::TColumnEngineForLogs(const ui64 tabletId,
+TColumnEngineForLogs::TColumnEngineForLogs(const ui64 tabletId, const std::shared_ptr<TSchemaObjectsCache>& schemaCache,
     const std::shared_ptr<NDataAccessorControl::IDataAccessorsManager>& dataAccessorsManager,
     const std::shared_ptr<IStoragesManager>& storagesManager, const TSnapshot& snapshot, TIndexInfo&& schema)
     : GranulesStorage(std::make_shared<TGranulesStorage>(SignalCounters, dataAccessorsManager, storagesManager))
     , DataAccessorsManager(dataAccessorsManager)
     , StoragesManager(storagesManager)
+    , SchemaObjectsCache(schemaCache)
     , TabletId(tabletId)
     , LastPortion(0)
     , LastGranule(0) {
@@ -150,7 +152,7 @@ void TColumnEngineForLogs::RegisterSchemaVersion(const TSnapshot& snapshot, TInd
     }
 
     const bool isCriticalScheme = indexInfo.GetSchemeNeedActualization();
-    auto* indexInfoActual = VersionedIndex.AddIndex(snapshot, std::move(indexInfo));
+    auto* indexInfoActual = VersionedIndex.AddIndex(snapshot, SchemaObjectsCache->GetIndexInfoCache(std::move(indexInfo)));
     if (isCriticalScheme) {
         StartActualization({});
         for (auto&& i : GranulesStorage->GetTables()) {
@@ -215,7 +217,7 @@ void TColumnEngineForLogs::RegisterOldSchemaVersion(const TSnapshot& snapshot, c
     }
 
     AFL_VERIFY(indexInfoOptional);
-    VersionedIndex.AddIndex(snapshot, std::move(*indexInfoOptional));
+    VersionedIndex.AddIndex(snapshot, SchemaObjectsCache->GetIndexInfoCache(std::move(*indexInfoOptional)));
 }
 
 std::shared_ptr<ITxReader> TColumnEngineForLogs::BuildLoader(const std::shared_ptr<IBlobGroupSelector>& dsGroupSelector) {

ydb/core/tx/columnshard/engines/column_engine_logs.h

@@ -61,7 +61,7 @@ class TColumnEngineForLogs: public IColumnEngine {
     std::shared_ptr<IStoragesManager> StoragesManager;
 
     std::shared_ptr<NActualizer::TController> ActualizationController;
-    std::shared_ptr<TSchemaObjectsCache> SchemaObjectsCache = std::make_shared<TSchemaObjectsCache>();
+    std::shared_ptr<TSchemaObjectsCache> SchemaObjectsCache;
     TVersionedIndex VersionedIndex;
     std::shared_ptr<TVersionedIndex> VersionedIndexCopy;
 
@@ -98,9 +98,11 @@ class TColumnEngineForLogs: public IColumnEngine {
         ADD,
     };
 
-    TColumnEngineForLogs(const ui64 tabletId, const std::shared_ptr<NDataAccessorControl::IDataAccessorsManager>& dataAccessorsManager,
+    TColumnEngineForLogs(const ui64 tabletId, const std::shared_ptr<TSchemaObjectsCache>& schemaCache,
+        const std::shared_ptr<NDataAccessorControl::IDataAccessorsManager>& dataAccessorsManager,
         const std::shared_ptr<IStoragesManager>& storagesManager, const TSnapshot& snapshot, const TSchemaInitializationData& schema);
-    TColumnEngineForLogs(const ui64 tabletId, const std::shared_ptr<NDataAccessorControl::IDataAccessorsManager>& dataAccessorsManager,
+    TColumnEngineForLogs(const ui64 tabletId, const std::shared_ptr<TSchemaObjectsCache>& schemaCache,
+        const std::shared_ptr<NDataAccessorControl::IDataAccessorsManager>& dataAccessorsManager,
         const std::shared_ptr<IStoragesManager>& storagesManager, const TSnapshot& snapshot, TIndexInfo&& schema);
 
     void OnTieringModified(const std::optional<NOlap::TTiering>& ttl, const ui64 pathId) override;

ydb/core/tx/columnshard/engines/scheme/index_info.cpp

@@ -76,7 +76,7 @@ std::vector<TString> TIndexInfo::GetColumnNames(const std::vector<ui32>& ids) co
 }
 
 std::vector<std::string> TIndexInfo::GetColumnSTLNames(const bool withSpecial) const {
-    const auto ids = GetColumnIds(withSpecial);
+    const TColumnIdsView ids = GetColumnIds(withSpecial);
     std::vector<std::string> out;
     out.reserve(ids.size());
     for (ui32 id : ids) {
@@ -457,7 +457,7 @@ std::shared_ptr<NIndexes::NCountMinSketch::TIndexMeta> TIndexInfo::GetIndexMetaC
 }
 
 std::vector<ui32> TIndexInfo::GetEntityIds() const {
-    const auto columnIds = GetColumnIds(true);
+    const TColumnIdsView columnIds = GetColumnIds(true);
     std::vector<ui32> result(columnIds.begin(), columnIds.end());
     for (auto&& i : Indexes) {
         result.emplace_back(i.first);

ydb/core/tx/columnshard/engines/scheme/objects_cache.cpp

@@ -1,5 +1,17 @@
 #include "objects_cache.h"
 
+#include <ydb/core/tx/columnshard/engines/scheme/index_info.h>
+
 namespace NKikimr::NOlap {
 
+std::shared_ptr<const TIndexInfo> TSchemaObjectsCache::GetIndexInfoCache(TIndexInfo&& indexInfo) {
+    const ui64 schemaVersion = indexInfo.GetVersion();
+    std::unique_lock lock(SchemasMutex);
+    auto* findSchema = SchemasByVersion.FindPtr(schemaVersion);
+    if (!findSchema || findSchema->expired()) {
+        SchemasByVersion[schemaVersion] = std::make_shared<TIndexInfo>(std::move(indexInfo));
+    }
+    return findSchema->lock();
+}
+
 }   // namespace NKikimr::NOlap

ydb/core/tx/columnshard/engines/scheme/objects_cache.h

@@ -10,10 +10,18 @@ namespace NKikimr::NOlap {
 class TSchemaObjectsCache {
 private:
     THashMap<TString, std::shared_ptr<arrow::Field>> Fields;
-    THashMap<TString, std::shared_ptr<TColumnFeatures>> ColumnFeatures;
-    THashSet<TString> StringsCache;
     mutable ui64 AcceptionFieldsCount = 0;
+    mutable TMutex FieldsMutex;
+
+    THashMap<TString, std::shared_ptr<TColumnFeatures>> ColumnFeatures;
     mutable ui64 AcceptionFeaturesCount = 0;
+    mutable TMutex FeaturesMutex;
+
+    THashMap<ui64, std::weak_ptr<const TIndexInfo>> SchemasByVersion;
+    mutable TMutex SchemasMutex;
+
+    THashSet<TString> StringsCache;
+    mutable TMutex StringsMutex;
 
 public:
     const TString& GetStringCache(const TString& original) {
@@ -26,13 +34,16 @@ class TSchemaObjectsCache {
 
     void RegisterField(const TString& fingerprint, const std::shared_ptr<arrow::Field>& f) {
         AFL_TRACE(NKikimrServices::TX_COLUMNSHARD)("event", "register_field")("fp", fingerprint)("f", f->ToString());
+        std::unique_lock lock(FieldsMutex);
         AFL_VERIFY(Fields.emplace(fingerprint, f).second);
     }
     void RegisterColumnFeatures(const TString& fingerprint, const std::shared_ptr<TColumnFeatures>& f) {
         AFL_TRACE(NKikimrServices::TX_COLUMNSHARD)("event", "register_column_features")("fp", fingerprint)("info", f->DebugString());
+        std::unique_lock lock(FeaturesMutex);
         AFL_VERIFY(ColumnFeatures.emplace(fingerprint, f).second);
     }
     std::shared_ptr<arrow::Field> GetField(const TString& fingerprint) const {
+        std::unique_lock lock(FieldsMutex);
         auto it = Fields.find(fingerprint);
         if (it == Fields.end()) {
             AFL_TRACE(NKikimrServices::TX_COLUMNSHARD)("event", "get_field_miss")("fp", fingerprint)("count", Fields.size())(
@@ -47,6 +58,7 @@ class TSchemaObjectsCache {
     }
     template <class TConstructor>
     TConclusion<std::shared_ptr<TColumnFeatures>> GetOrCreateColumnFeatures(const TString& fingerprint, const TConstructor& constructor) {
+        std::unique_lock lock(FeaturesMutex);
         auto it = ColumnFeatures.find(fingerprint);
         if (it == ColumnFeatures.end()) {
             AFL_TRACE(NKikimrServices::TX_COLUMNSHARD)("event", "get_column_features_miss")("fp", UrlEscapeRet(fingerprint))(
@@ -65,6 +77,25 @@ class TSchemaObjectsCache {
         }
         return it->second;
     }
+
+    std::shared_ptr<const TIndexInfo> GetIndexInfoCache(TIndexInfo&& indexInfo);
+};
+
+class TSchemaCachesManager {
+private:
+    THashMap<ui64, std::shared_ptr<TSchemaObjectsCache>> CacheByTableOwner;
+    TMutex Mutex;
+
+public:
+    std::shared_ptr<TSchemaObjectsCache> GetCache(const ui64 ownerPathId) {
+        AFL_VERIFY(ownerPathId);
+        std::unique_lock lock(Mutex);
+        auto findCache = CacheByTableOwner.FindPtr(ownerPathId);
+        if (findCache) {
+            return *findCache;
+        }
+        return CacheByTableOwner.emplace(ownerPathId, std::make_shared<TSchemaObjectsCache>()).first->second;
+    }
 };
 
 }   // namespace NKikimr::NOlap

ydb/core/tx/columnshard/engines/scheme/versions/snapshot_scheme.cpp

@@ -2,39 +2,39 @@
 
 namespace NKikimr::NOlap {
 
-TSnapshotSchema::TSnapshotSchema(TIndexInfo&& indexInfo, const TSnapshot& snapshot)
+TSnapshotSchema::TSnapshotSchema(const std::shared_ptr<const TIndexInfo>& indexInfo, const TSnapshot& snapshot)
     : IndexInfo(std::move(indexInfo))
-    , Schema(IndexInfo.ArrowSchemaWithSpecials())
+    , Schema(IndexInfo->ArrowSchemaWithSpecials())
     , Snapshot(snapshot)
 {
 }
 
 TColumnSaver TSnapshotSchema::GetColumnSaver(const ui32 columnId) const {
-    return IndexInfo.GetColumnSaver(columnId);
+    return IndexInfo->GetColumnSaver(columnId);
 }
 
 std::shared_ptr<TColumnLoader> TSnapshotSchema::GetColumnLoaderOptional(const ui32 columnId) const {
-    return IndexInfo.GetColumnLoaderOptional(columnId);
+    return IndexInfo->GetColumnLoaderOptional(columnId);
 }
 
 std::optional<ui32> TSnapshotSchema::GetColumnIdOptional(const std::string& columnName) const {
-    return IndexInfo.GetColumnIdOptional(columnName);
+    return IndexInfo->GetColumnIdOptional(columnName);
 }
 
 ui32 TSnapshotSchema::GetColumnIdVerified(const std::string& columnName) const {
-    return IndexInfo.GetColumnIdVerified(columnName);
+    return IndexInfo->GetColumnIdVerified(columnName);
 }
 
 int TSnapshotSchema::GetFieldIndex(const ui32 columnId) const {
-    return IndexInfo.GetColumnIndexOptional(columnId).value_or(-1);
+    return IndexInfo->GetColumnIndexOptional(columnId).value_or(-1);
 }
 
 const std::shared_ptr<NArrow::TSchemaLite>& TSnapshotSchema::GetSchema() const {
     return Schema;
 }
 
 const TIndexInfo& TSnapshotSchema::GetIndexInfo() const {
-    return IndexInfo;
+    return *IndexInfo;
 }
 
 const TSnapshot& TSnapshotSchema::GetSnapshot() const {
@@ -46,7 +46,7 @@ ui32 TSnapshotSchema::GetColumnsCount() const {
 }
 
 ui64 TSnapshotSchema::GetVersion() const {
-    return IndexInfo.GetVersion();
+    return IndexInfo->GetVersion();
 }
 
 }

ydb/core/tx/columnshard/engines/scheme/versions/snapshot_scheme.h

@@ -8,23 +8,23 @@ namespace NKikimr::NOlap {
 
 class TSnapshotSchema: public ISnapshotSchema {
 private:
-    TIndexInfo IndexInfo;
+    std::shared_ptr<const TIndexInfo> IndexInfo;
     std::shared_ptr<NArrow::TSchemaLite> Schema;
     TSnapshot Snapshot;
 protected:
     virtual TString DoDebugString() const override {
         return TStringBuilder() << "("
             "schema=" << Schema->ToString() << ";" <<
             "snapshot=" << Snapshot.DebugString() << ";" <<
-            "index_info=" << IndexInfo.DebugString() << ";" <<
+            "index_info=" << IndexInfo->DebugString() << ";" <<
             ")"
             ;
     }
 public:
-    TSnapshotSchema(TIndexInfo&& indexInfo, const TSnapshot& snapshot);
+    TSnapshotSchema(const std::shared_ptr<const TIndexInfo>& indexInfo, const TSnapshot& snapshot);
 
     virtual TColumnIdsView GetColumnIds() const override {
-        return IndexInfo.GetColumnIds();
+        return IndexInfo->GetColumnIds();
     }
 
     TColumnSaver GetColumnSaver(const ui32 columnId) const override;

ydb/core/tx/columnshard/engines/scheme/versions/versioned_index.cpp

@@ -6,16 +6,16 @@
 
 namespace NKikimr::NOlap {
 
-const TIndexInfo* TVersionedIndex::AddIndex(const TSnapshot& snapshot, TIndexInfo&& indexInfo) {
+const TIndexInfo* TVersionedIndex::AddIndex(const TSnapshot& snapshot, const std::shared_ptr<const TIndexInfo>& indexInfo) {
     if (Snapshots.empty()) {
-        PrimaryKey = indexInfo.GetPrimaryKey();
+        PrimaryKey = indexInfo->GetPrimaryKey();
     } else {
-        Y_ABORT_UNLESS(PrimaryKey->Equals(indexInfo.GetPrimaryKey()));
+        Y_ABORT_UNLESS(PrimaryKey->Equals(indexInfo->GetPrimaryKey()));
     }
 
-    const bool needActualization = indexInfo.GetSchemeNeedActualization();
-    auto newVersion = indexInfo.GetVersion();
-    auto itVersion = SnapshotByVersion.emplace(newVersion, std::make_shared<TSnapshotSchema>(std::move(indexInfo), snapshot));
+    const bool needActualization = indexInfo->GetSchemeNeedActualization();
+    auto newVersion = indexInfo->GetVersion();
+    auto itVersion = SnapshotByVersion.emplace(newVersion, std::make_shared<TSnapshotSchema>(indexInfo, snapshot));
     if (!itVersion.second) {
         AFL_INFO(NKikimrServices::TX_COLUMNSHARD)("message", "Skip registered version")("version", LastSchemaVersion);
     } else if (needActualization) {

ydb/core/tx/columnshard/engines/scheme/versions/versioned_index.h

@@ -123,7 +123,7 @@ class TVersionedIndex {
         return PrimaryKey;
     }
 
-    const TIndexInfo* AddIndex(const TSnapshot& snapshot, TIndexInfo&& indexInfo);
+    const TIndexInfo* AddIndex(const TSnapshot& snapshot, const std::shared_ptr<const TIndexInfo>& indexInfo);
 
     bool LoadShardingInfo(IDbWrapper& db);
 };

ydb/core/tx/columnshard/loading/stages.cpp

@@ -194,7 +194,8 @@ bool TSpecialValuesInitializer::DoPrecharge(NTabletFlatExecutor::TTransactionCon
 
 bool TTablesManagerInitializer::DoExecute(NTabletFlatExecutor::TTransactionContext& txc, const TActorContext& /*ctx*/) {
     NIceDb::TNiceDb db(txc.DB);
-    TTablesManager tablesManagerLocal(Self->StoragesManager, Self->DataAccessorsManager.GetObjectPtrVerified(), Self->TabletID());
+    TTablesManager tablesManagerLocal(Self->StoragesManager, Self->DataAccessorsManager.GetObjectPtrVerified(),
+        Singleton<NOlap::TSchemaCachesManager>()->GetCache(Self->OwnerPathId), Self->TabletID());
     {
         TMemoryProfileGuard g("TTxInit/TTablesManager");
         if (!tablesManagerLocal.InitFromDB(db)) {

ydb/core/tx/columnshard/normalizer/portion/chunks.cpp

@@ -140,7 +140,8 @@ TConclusion<std::vector<INormalizerTask::TPtr>> TChunksNormalizer::DoInit(
         return tasks;
     }
 
-    TTablesManager tablesManager(controller.GetStoragesManager(), std::make_shared<NDataAccessorControl::TLocalManager>(nullptr), 0);
+    TTablesManager tablesManager(controller.GetStoragesManager(), std::make_shared<NDataAccessorControl::TLocalManager>(nullptr),
+        std::make_shared<TSchemaObjectsCache>(), 0);
     if (!tablesManager.InitFromDB(db)) {
         ACFL_TRACE("normalizer", "TChunksNormalizer")("error", "can't initialize tables manager");
         return TConclusionStatus::Fail("Can't load index");

ydb/core/tx/columnshard/normalizer/portion/leaked_blobs.cpp

@@ -181,8 +181,8 @@ TConclusion<std::vector<INormalizerTask::TPtr>> TLeakedBlobsNormalizer::DoInit(
         return TConclusionStatus::Fail("Not ready");
     }
 
-    NColumnShard::TTablesManager tablesManager(
-        controller.GetStoragesManager(), std::make_shared<NDataAccessorControl::TLocalManager>(nullptr), TabletId);
+    NColumnShard::TTablesManager tablesManager(controller.GetStoragesManager(), std::make_shared<NDataAccessorControl::TLocalManager>(nullptr),
+        std::make_shared<TSchemaObjectsCache>(), TabletId);
 
     if (!tablesManager.InitFromDB(db)) {
         ACFL_TRACE("normalizer", "TPortionsNormalizer")("error", "can't initialize tables manager");

ydb/core/tx/columnshard/normalizer/portion/normalizer.cpp

@@ -25,7 +25,8 @@ TConclusion<std::vector<INormalizerTask::TPtr>> TPortionsNormalizerBase::DoInit(
         return TConclusionStatus::Fail("Not ready");
     }
 
-    NColumnShard::TTablesManager tablesManager(controller.GetStoragesManager(), std::make_shared<NDataAccessorControl::TLocalManager>(nullptr), 0);
+    NColumnShard::TTablesManager tablesManager(controller.GetStoragesManager(), std::make_shared<NDataAccessorControl::TLocalManager>(nullptr),
+        std::make_shared<TSchemaObjectsCache>(), 0);
     if (!tablesManager.InitFromDB(db)) {
         ACFL_TRACE("normalizer", "TPortionsNormalizer")("error", "can't initialize tables manager");
         return TConclusionStatus::Fail("Can't load index");

ydb/core/tx/columnshard/normalizer/portion/restore_portion_from_chunks.cpp

@@ -72,7 +72,8 @@ TConclusion<std::vector<INormalizerTask::TPtr>> TNormalizer::DoInit(
         return TConclusionStatus::Fail("Not ready");
     }
 
-    TTablesManager tablesManager(controller.GetStoragesManager(), std::make_shared<NDataAccessorControl::TLocalManager>(nullptr), 0);
+    TTablesManager tablesManager(controller.GetStoragesManager(), std::make_shared<NDataAccessorControl::TLocalManager>(nullptr),
+        std::make_shared<TSchemaObjectsCache>(), 0);
     if (!tablesManager.InitFromDB(db)) {
         ACFL_TRACE("normalizer", "TChunksNormalizer")("error", "can't initialize tables manager");
         return TConclusionStatus::Fail("Can't load index");