poorbarcode commented on code in PR #19972:
URL: https://github.com/apache/pulsar/pull/19972#discussion_r1155093515


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentTopic.java:
##########
@@ -1696,14 +1696,31 @@ public void openCursorFailed(ManagedLedgerException 
exception, Object ctx) {
         return future;
     }
 
+    private CompletableFuture<Boolean> checkReplicationCluster(String 
remoteCluster) {
+        return 
brokerService.getPulsar().getPulsarResources().getNamespaceResources()
+                .getPoliciesAsync(TopicName.get(topic).getNamespaceObject())
+                .thenApply(optPolicies -> optPolicies.map(policies -> 
policies.replication_clusters)
+                        .orElse(Collections.emptySet()).contains(remoteCluster)
+                        || 
topicPolicies.getReplicationClusters().get().contains(remoteCluster));
+    }
+
     protected CompletableFuture<Void> addReplicationCluster(String 
remoteCluster, ManagedCursor cursor,
             String localCluster) {
         return 
AbstractReplicator.validatePartitionedTopicAsync(PersistentTopic.this.getName(),
 brokerService)
-                .thenCompose(__ -> 
brokerService.pulsar().getPulsarResources().getClusterResources()
-                        .getClusterAsync(remoteCluster)
-                        .thenApply(clusterData ->
-                                
brokerService.getReplicationClient(remoteCluster, clusterData)))
+                .thenCompose(__ -> checkReplicationCluster(remoteCluster))
+                .thenCompose(clusterExists -> {
+                    if (!clusterExists) {
+                        return removeReplicator(remoteCluster).thenApply(__ -> 
null);

Review Comment:
   Since it is not a regular event, could we print a warning log here?



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