jfrazee commented on a change in pull request #5004:
URL: https://github.com/apache/nifi/pull/5004#discussion_r621720876



##########
File path: 
nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-cluster/src/main/java/org/apache/nifi/cluster/coordination/heartbeat/AbstractHeartbeatMonitor.java
##########
@@ -343,4 +374,25 @@ public void onLocalNodeIdentifierSet(final NodeIdentifier 
localNodeId) {
         public void onNodeStateChange(final NodeIdentifier nodeId, final 
NodeConnectionState newState) {
         }
     }
+
+    private class RemoveHeartbeatsOnNodeRemoval implements 
ClusterTopologyEventListener {

Review comment:
       @markap14 I'm confused about the difference between 
`RemoveHeartbeatsOnNodeRemoval` and `ClusterChangeEventListener` which both 
seem to just remove heartbeats for `onNodeRemoved()`. Is there a reason to not 
register/unregister `ClusterChangeEventListener` on `start()` and `stop()` and 
just have one of them?




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