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https://issues.apache.org/jira/browse/YARN-6603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16011258#comment-16011258
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Jason Lowe commented on YARN-6603:
----------------------------------
Same type of line in question as YARN-4763:
{code}
RMAppAttempt appAttempt =
rm.getRMContext().getRMApps().get(appAttemptId.getApplicationId())
.getAppAttempts().get(appAttemptId);
{code}
I believe the issue can occur if an app gets removed form the RMContext after
the app reports are gathered but before the loop ends up trying to lookup the
app. In that case
{{rm.getRMContext().getRMApps().get(appAttemptId.getApplicationId())}} is going
to return null and a subsequent call to getAppAttempts() is going to trigger
the NPE.
> NPE in RMAppsBlock
> ------------------
>
> Key: YARN-6603
> URL: https://issues.apache.org/jira/browse/YARN-6603
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.8.0
> Reporter: Jason Lowe
>
> We are seeing an intermittent NPE when the RM is trying to render the
> /cluster URI.
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