mgao0 commented on a change in pull request #1456:
URL: https://github.com/apache/helix/pull/1456#discussion_r508892056



##########
File path: 
helix-core/src/main/java/org/apache/helix/controller/GenericHelixController.java
##########
@@ -1299,6 +1308,10 @@ protected void 
checkLiveInstancesObservation(List<LiveInstance> liveInstances,
   }
 
   public void shutdown() throws InterruptedException {
+    if (_periodicRebalancerFutureTasks != null) {
+      _periodicRebalancerFutureTasks.cancel(false);
+    }
+    _periodicalRebalanceExecutor.shutdown();

Review comment:
       Yes shutdownPipeline() does shut down the event process thread, but when 
you call shutdownNow, it's the thread inside the executor is shut down. I think 
they are different threads.




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