Bootstrapper: don't restart healthy tablets (#9659)

Author: snaury

ydb/core/base/statestorage.cpp

@@ -164,13 +164,14 @@ void TStateStorageInfo::TSelection::MergeReply(EStatus status, EStatus *owner, u
     ui32 unknown = 0;
     ui32 ok = 0;
     ui32 outdated = 0;
+    ui32 unavailable = 0;
 
     const ui32 majority = Sz / 2 + 1;
 
     ui32 cookie = 0;
     for (ui32 i = 0; i < Sz; ++i) {
         EStatus &st = Status[i];
-        if (resetOld && st != StatusUnknown)
+        if (resetOld && st != StatusUnknown && st != StatusUnavailable)
             st = StatusOutdated;
 
         if (cookie == targetCookie)
@@ -190,16 +191,19 @@ void TStateStorageInfo::TSelection::MergeReply(EStatus status, EStatus *owner, u
         case StatusOutdated:
             ++outdated;
             break;
+        case StatusUnavailable:
+            ++unavailable;
+            break;
         }
     }
 
     if (owner) {
         if (ok >= majority) {
             *owner = StatusOk;
-        } else if (outdated >= majority) {
-            *owner = StatusOutdated;
         } else if (ok + unknown < majority) {
-            if (outdated)
+            if (unavailable > (Sz - majority))
+                *owner = StatusUnavailable;
+            else if (outdated)
                 *owner = StatusOutdated;
             else
                 *owner = StatusNoInfo;

ydb/core/base/statestorage.h

@@ -470,6 +470,7 @@ struct TStateStorageInfo : public TThrRefBase {
             StatusOk,
             StatusNoInfo,
             StatusOutdated,
+            StatusUnavailable,
         };
 
         ui32 Sz;

ydb/core/base/statestorage_proxy.cpp

@@ -177,7 +177,7 @@ class TStateStorageProxyRequest : public TActor<TStateStorageProxyRequest> {
             Signature[cookie] = Max<ui64>();
             ++RepliesMerged;
 
-            ReplicaSelection->MergeReply(TStateStorageInfo::TSelection::StatusNoInfo, &ReplyStatus, cookie, false);
+            ReplicaSelection->MergeReply(TStateStorageInfo::TSelection::StatusUnavailable, &ReplyStatus, cookie, false);
         }
     }
 
@@ -192,7 +192,8 @@ class TStateStorageProxyRequest : public TActor<TStateStorageProxyRequest> {
         ++RepliesMerged;
         ++SignaturesMerged;
 
-        if (status == NKikimrProto::OK) {
+        switch (status) {
+        case NKikimrProto::OK: {
             const ui32 gen = record.GetCurrentGeneration();
             const ui32 step = record.GetCurrentStep();
             const TActorId leader = ActorIdFromProto(record.GetCurrentLeader());
@@ -221,9 +222,14 @@ class TStateStorageProxyRequest : public TActor<TStateStorageProxyRequest> {
 
                 ReplicaSelection->MergeReply(TStateStorageInfo::TSelection::StatusOk, &ReplyStatus, cookie, reset);
             }
-        } else if (status == NKikimrProto::ERROR) {
+            break;
+        }
+        // NOTE: replicas currently reply with ERROR when there is no data for the tablet
+        case NKikimrProto::ERROR:
+        case NKikimrProto::NODATA:
             ReplicaSelection->MergeReply(TStateStorageInfo::TSelection::StatusNoInfo, &ReplyStatus, cookie, false);
-        } else {
+            break;
+        default:
             Y_ABORT();
         }
 
@@ -307,11 +313,14 @@ class TStateStorageProxyRequest : public TActor<TStateStorageProxyRequest> {
             ReplyAndDie(NKikimrProto::OK);
             return;
         case TStateStorageInfo::TSelection::StatusNoInfo:
-            ReplyAndDie(NKikimrProto::ERROR);
+            ReplyAndDie(NKikimrProto::NODATA);
             return;
         case TStateStorageInfo::TSelection::StatusOutdated:
             ReplyAndDie(NKikimrProto::RACE);
             return;
+        case TStateStorageInfo::TSelection::StatusUnavailable:
+            ReplyAndDie(NKikimrProto::ERROR);
+            return;
         }
         Y_DEBUG_ABORT_UNLESS(false);
         PassAway();
@@ -332,12 +341,15 @@ class TStateStorageProxyRequest : public TActor<TStateStorageProxyRequest> {
                 return;
             case TStateStorageInfo::TSelection::StatusNoInfo:
                 if (RepliesMerged == Replicas) { // for negative response always waits for full reply set to avoid herding of good replicas by fast retry cycle
-                    ReplyAndSig(NKikimrProto::ERROR);
+                    ReplyAndSig(NKikimrProto::NODATA);
                 }
                 return;
             case TStateStorageInfo::TSelection::StatusOutdated:
                 ReplyAndSig(NKikimrProto::RACE);
                 return;
+            case TStateStorageInfo::TSelection::StatusUnavailable:
+                ReplyAndSig(NKikimrProto::ERROR);
+                return;
             }
         }
     }
@@ -379,6 +391,8 @@ class TStateStorageProxyRequest : public TActor<TStateStorageProxyRequest> {
             }
             return;
         case TStateStorageInfo::TSelection::StatusNoInfo:
+        case TStateStorageInfo::TSelection::StatusUnavailable:
+            // Note: StatusNoInfo shouldn't really happen for update queries
             ReplyAndDie(NKikimrProto::ERROR);
             return;
         case TStateStorageInfo::TSelection::StatusOutdated:
@@ -404,7 +418,8 @@ class TStateStorageProxyRequest : public TActor<TStateStorageProxyRequest> {
             }
             return;
             case TStateStorageInfo::TSelection::StatusNoInfo:
-                // should not happens for update queries
+            case TStateStorageInfo::TSelection::StatusUnavailable:
+                // Note: StatusNoInfo shouldn't really happen for update queries
                 ReplyAndSig(NKikimrProto::ERROR);
                 return;
             case TStateStorageInfo::TSelection::StatusOutdated:

ydb/core/base/statestorage_replica.cpp

@@ -104,6 +104,7 @@ class TStateStorageReplica : public TActorBootstrapped<TStateStorageReplica> {
                 }
             }
         } else {
+            // FIXME: change to NODATA in a future version
             msg.Reset(new TEvStateStorage::TEvReplicaInfo(tabletId, NKikimrProto::ERROR));
         }
         msg->Record.SetCookie(cookie);