dasahcc commented on a change in pull request #1456:
URL: https://github.com/apache/helix/pull/1456#discussion_r509550886



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File path: 
helix-core/src/main/java/org/apache/helix/controller/GenericHelixController.java
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@@ -1307,6 +1315,11 @@ public void shutdown() throws InterruptedException {
     logger.info("Shutting down {} pipeline", Pipeline.Type.TASK.name());
     shutdownPipeline(_taskEventThread, _taskEventQueue);
 
+    if (!_periodicalRebalanceExecutor

Review comment:
       Could supurious wake up can impact this?  I am not sure why we would 
like to wait here? Are we worrying about the partial task running? If it wakes 
up and return false, it will kill thread immediately. There is no difference as 
we kill it at first beginning.
   
   




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