additional logging (ydb-platform#4195)

ydb/core/tx/tiering/ut/ut_tiers.cpp

@@ -927,8 +927,9 @@ Y_UNIT_TEST_SUITE(ColumnShardTiers) {
             return false;
         };
         runtime.SetEventFilter(captureEvents);
-
+        Cerr << "START data loading..." << Endl;
         lHelper.SendDataViaActorSystem("/Root/olapStore/olapTable", batch);
+        Cerr << "Data loading FINISHED" << Endl;
 
         {
             TVector<THashMap<TString, NYdb::TValue>> result;
@@ -941,6 +942,7 @@ Y_UNIT_TEST_SUITE(ColumnShardTiers) {
         }
         const ui32 reduceStepsCount = 1;
         for (ui32 i = 0; i < reduceStepsCount; ++i) {
+            Cerr << "START data cleaning..." << Endl;
             runtime.AdvanceCurrentTime(TDuration::Seconds(numRecords * (i + 1) / reduceStepsCount + 500000));
             const ui64 purposeSize = 800000000.0 * (1 - 1.0 * (i + 1) / reduceStepsCount);
             const ui64 purposeRecords = numRecords * (1 - 1.0 * (i + 1) / reduceStepsCount);
@@ -950,7 +952,7 @@ Y_UNIT_TEST_SUITE(ColumnShardTiers) {
                 runtime.AdvanceCurrentTime(TDuration::Minutes(6));
                 runtime.SimulateSleep(TDuration::Seconds(1));
             }
-            Cerr << bsCollector.GetChannelSize(2) << "/" << purposeSize << Endl;
+            Cerr << "CLEANED: " << bsCollector.GetChannelSize(2) << "/" << purposeSize << Endl;
 
             TVector<THashMap<TString, NYdb::TValue>> result;
             lHelper.StartScanRequest("SELECT MIN(timestamp) as b, COUNT(*) as c FROM `/Root/olapStore/olapTable`", true, &result);