Some minor KeyValue tablet improvements (merge from main #1900) (#4644)

Author: alexvru

ydb/core/keyvalue/channel_balancer.h

@@ -114,7 +114,7 @@ namespace NKikimr::NKeyValue {
                     const size_t index = (LatencyQueue.size() - 1) * 99 / 100;
                     const TDuration perc = latencies[index];
                     weight = MeanExpectedLatency.GetValue() * weight / Max(perc, TDuration::MilliSeconds(1)).GetValue();
-                    Y_DEBUG_ABORT_UNLESS(weight);
+                    //Y_DEBUG_ABORT_UNLESS(weight);
                     if (!weight) {
                         weight = 1;
                     }

ydb/core/keyvalue/keyvalue_state.cpp

@@ -634,6 +634,9 @@ void TKeyValueState::InitExecute(ui64 tabletId, TActorId keyValueActorId, ui32 e
     }
 
     THelpers::DbEraseCollect(db, ctx);
+    if (IsEmptyDbStart) {
+        THelpers::DbUpdateState(StoredState, db, ctx);
+    }
 
     // corner case, if no CollectGarbage events were sent
     if (InitialCollectsSent == 0) {

ydb/core/keyvalue/keyvalue_storage_request.cpp

@@ -296,6 +296,11 @@ class TKeyValueStorageRequest : public TActorBootstrapped<TKeyValueStorageReques
                 IntermediateResults->Stat.GroupReadIops[std::make_pair(response.Id.Channel(), groupId)] += 1; // FIXME: count distinct blobs?
                 read.Value.Write(readItem.ValueOffset, std::move(response.Buffer));
             } else {
+                Y_VERIFY_DEBUG_S(response.Status != NKikimrProto::NODATA, "NODATA received for TEvGet"
+                    << " TabletId# " << TabletInfo->TabletID
+                    << " Id# " << response.Id
+                    << " Key# " << read.Key);
+
                 TStringStream err;
                 if (read.Message.size()) {
                     err << read.Message << Endl;