jiajunwang commented on a change in pull request #1753:
URL: https://github.com/apache/helix/pull/1753#discussion_r639293337
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File path:
helix-core/src/main/java/org/apache/helix/participant/DistClusterControllerStateModel.java
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@@ -85,7 +85,7 @@ public void onBecomeStandbyFromLeader(Message message,
NotificationContext conte
logger.info(controllerName + " becoming standby from leader for " +
clusterName);
- if (_controller != null) {
+ if (_controllerOpt.isPresent()) {
Review comment:
1. State transitions are all happening in one thread. So there is no
race condition between the reset here and the creation logic. This PR is to fix
the NPE when the reset is triggered by shutdown. So this line won't cause the
issue even without the fix.
2. This fix is only to fix NPE, it won't fix all potential leakage. Note
that if the partition is in ERROR state, then when we drop the partition, there
is no clean up. This is the most serious leakage, actually. If the test is
still not stable, I plan to fix this problem in another PR.
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