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https://issues.apache.org/jira/browse/YARN-5694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15706745#comment-15706745
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Daniel Templeton commented on YARN-5694:
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Thanks, [~jianhe]. Yeah, it probably should go into 2.6 as well.
> ZKRMStateStore can prevent the transition to standby in branch-2.7 if the ZK
> node is unreachable
> ------------------------------------------------------------------------------------------------
>
> Key: YARN-5694
> URL: https://issues.apache.org/jira/browse/YARN-5694
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.7.3
> Reporter: Daniel Templeton
> Assignee: Daniel Templeton
> Priority: Critical
> Labels: oct16-medium
> Attachments: YARN-5694.001.patch, YARN-5694.002.patch,
> YARN-5694.003.patch, YARN-5694.004.patch, YARN-5694.004.patch,
> YARN-5694.005.patch, YARN-5694.006.patch, YARN-5694.007.patch,
> YARN-5694.008.patch, YARN-5694.branch-2.7.001.patch,
> YARN-5694.branch-2.7.002.patch, YARN-5694.branch-2.7.004.patch,
> YARN-5694.branch-2.7.005.patch
>
>
> {{ZKRMStateStore.doStoreMultiWithRetries()}} holds the lock while trying to
> talk to ZK. If the connection fails, it will retry while still holding the
> lock. The retries are intended to be strictly time limited, but in the case
> that the ZK node is unreachable, the time limit fails, resulting in the
> thread holding the lock for over an hour. Transitioning the RM to standby
> requires that same lock, so in exactly the case that the RM should be
> transitioning to standby, the {{VerifyActiveStatusThread}} blocks it from
> happening.
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