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https://issues.apache.org/jira/browse/YARN-1934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13967437#comment-13967437
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Rohith commented on YARN-1934:
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Call flow is attached file issue is
1. Disconnected event which made *zkClient=null*.
2. Call for ZKRMStateStore.updateApplicationAttemptStateInternal() from
RMAppAttemptImpl.(EXPIRED event not yet come).
> Potential NPE in ZKRMStateStore caused by handling Disconnected event from ZK.
> ------------------------------------------------------------------------------
>
> Key: YARN-1934
> URL: https://issues.apache.org/jira/browse/YARN-1934
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.4.0
> Reporter: Rohith
> Priority: Critical
> Attachments: RM.txt
>
>
> For ZK disconnected event , zkClient is set to null. It is very much prone to
> throw NPE.
> {noformat}
> case Disconnected:
> LOG.info("ZKRMStateStore Session disconnected");
> oldZkClient = zkClient;
> zkClient = null;
> break;
> {noformat}
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