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https://issues.apache.org/jira/browse/YARN-6598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16008649#comment-16008649
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Jason Lowe commented on YARN-6598:
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This was broken by YARN-4218 when the preemption metrics went in. The metrics
were assumed to be there without checking if they're missing, and they will be
missing for any job that was run prior to the upgrade to 2.8.
> History server getApplicationReport NPE when fetching report for pre-2.8 job
> ----------------------------------------------------------------------------
>
> Key: YARN-6598
> URL: https://issues.apache.org/jira/browse/YARN-6598
> Project: Hadoop YARN
> Issue Type: Bug
> Components: timelineserver
> Affects Versions: 2.8.0
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Priority: Blocker
>
> ApplicationHistoryManagerOnTimelineStore#convertToApplicationReport can NPE
> for a job that was run prior to the cluster upgrading to 2.8. It blindly
> assumes preemption metrics are present when CPU metrics are present, and when
> they are not it triggers the NPE.
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