jiajunwang opened a new issue #1752:
URL: https://github.com/apache/helix/issues/1752
### Describe the bug
One NPE is observed in the DistClusterControllerStateModel when cleanup is
triggered in parallel with other state transitions.
29066 [HelixTaskExecutor-message_handle_STATE_TRANSITION] ERROR
org.apache.helix.messaging.handling.HelixStateTransitionHandler - Exception
while executing a state transition task TestClusterStatusMonitorLifecycle0_2
java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.apache.helix.messaging.handling.HelixStateTransitionHandler.invoke(HelixStateTransitionHandler.java:386)
at
org.apache.helix.messaging.handling.HelixStateTransitionHandler.handleMessage(HelixStateTransitionHandler.java:313)
at org.apache.helix.messaging.handling.HelixTask.call(HelixTask.java:97)
at org.apache.helix.messaging.handling.HelixTask.call(HelixTask.java:49)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at
org.apache.helix.participant.DistClusterControllerStateModel.onBecomeLeaderFromStandby(DistClusterControllerStateModel.java:72)
... 11 more
I believe this exception makes the test TestClusterStatusMonitorLifecycle
unstable.
### To Reproduce
Trigger leader to standby transition and close the controller-participant at
the same time.
### Expected behavior
No NPE.
### Additional context
Add any other context about the problem here.
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