JAkutenshi commented on code in PR #4446:
URL: https://github.com/apache/ignite-3/pull/4446#discussion_r1871762720


##########
modules/replicator/src/main/java/org/apache/ignite/internal/replicator/ReplicaManager.java:
##########
@@ -1298,6 +1319,93 @@ private CompletableFuture<Boolean> 
onPrimaryExpired(PrimaryReplicaEventParameter
             return falseCompletedFuture();
         }
 
+        // TODO: move to Replica 
https://issues.apache.org/jira/browse/IGNITE-23750
+        private void registerFailoverCallback(TablePartitionId 
replicationGroupId) {
+            CompletableFuture<Replica> replicaFuture = 
replicaManager.replica(replicationGroupId);
+
+            // TODO: https://issues.apache.org/jira/browse/IGNITE-23753
+            // For now we assume that it's a possible situation to get null 
future on node's stopp process, but it should be fixed with
+            // a correct and consistent replica's state.
+            if (replicaFuture == null) {
+                return;
+            }
+
+            replicaFuture.thenApply(electedPrimaryReplica -> {

Review Comment:
   Hm, `ReplicaStateManager` don't have one. And it doesn't have (yet) 
`shutdown` method for turning busy lock on. There are options:
   1. Do we really need it?
   2. We may reuse `ReplicaManager`'s one?
   3. Or add the special one with `shutdown()` that will call on 
`ReplicaManager#stopAsync`?



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