Fix iteration in handoff map and balancing sender/deleter completion

ydb/core/blobstorage/vdisk/balance/balancing_actor.cpp

@@ -73,6 +73,8 @@ namespace NBalancing {
 
                 if (Stats.SendPartsLeft != 0 || Stats.DeletePartsLeft != 0) {
                     // sender or deleter has not finished yet
+                    Stats.SendCompleted = Stats.SendPartsLeft == 0;
+                    Stats.DeleteCompleted = Stats.DeletePartsLeft == 0;
                     ContinueBalancing();
                     return;
                 }

ydb/core/blobstorage/vdisk/balance/handoff_map.h

@@ -81,9 +81,12 @@ namespace NKikimr {
         // Transforms record according to the built handoff map. It returns item we need to write, pointer is
         // valid until next call. Nullptr indicates that item is to be removed completely.
         const TTransformedItem *Transform(const TKey& key, const TMemRec* memRec,
-                                          const TDataMerger* dataMerger, bool /*keepData*/) {
+                                          const TDataMerger* dataMerger, bool /*keepData*/, bool keepItem) {
             // do nothing by default, all work is done in template specialization for logo blobs
             Counter++;
+            if (!keepItem) {
+                return nullptr;
+            }
             Y_DEBUG_ABORT_UNLESS(dataMerger->Empty());
             return TrRes.SetRaw(key, memRec, dataMerger);
         }
@@ -163,10 +166,15 @@ namespace NKikimr {
             const TKeyLogoBlob& key,
             const TMemRecLogoBlob* memRec,
             const TDataMerger* dataMerger,
-            bool keepData)
+            bool keepData,
+            bool keepItem)
     {
         Y_DEFER { Counter++; };
 
+        if (!keepItem) {
+            return nullptr;
+        }
+
         if (!keepData) {
             return TrRes.SetRmData(key, memRec, dataMerger);
         }

ydb/core/blobstorage/vdisk/hullop/blobstorage_hullcompactworker.h

@@ -542,11 +542,11 @@ namespace NKikimr {
             IndexMerger.Finish();
 
             // reset transformed item and try to create new one if we want to keep this item
-            TransformedItem = nullptr;
-            if (GcmpIt.KeepItem()) {
-                const bool keepData = GcmpIt.KeepData();
+            const bool keepData = GcmpIt.KeepData();
+            const bool keepItem = GcmpIt.KeepItem();
+            TransformedItem = Hmp->Transform(key, &IndexMerger.GetMemRec(), IndexMerger.GetDataMerger(), keepData, keepItem);
+            if (keepItem) {
                 ++(keepData ? Statistics.KeepItemsWithData : Statistics.KeepItemsWOData);
-                TransformedItem = Hmp->Transform(key, &IndexMerger.GetMemRec(), IndexMerger.GetDataMerger(), keepData);
             } else {
                 ++Statistics.DontKeepItems;
             }