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https://issues.apache.org/jira/browse/TEZ-3335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15373330#comment-15373330
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Hitesh Shah commented on TEZ-3335:
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Seems like a bug in YARN that should be fixed too? Where if the RM does not
know about it, it means app has completed with final state/status unknown?
> DAG client thinks app is still running when app status is null
> --------------------------------------------------------------
>
> Key: TEZ-3335
> URL: https://issues.apache.org/jira/browse/TEZ-3335
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.7.1
> Reporter: Jason Lowe
>
> When an RM restarts without recovering apps (i.e.: either work-preserving is
> not enabled or state store was removed) and the YARN application history is
> enabled then YarnClient can return an application report with the app status
> as null. The RM doesn't know about the application, so the client redirects
> to the AHS. The AHS knows the app started at some point but will never
> received a finished event, hence the null app status.
> The DAG client fails to detect this scenario and believes the app is still
> running, so for example Hive clients will continue to hammer for status on an
> app that doesn't exist.
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