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https://issues.apache.org/jira/browse/MAPREDUCE-5418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13759405#comment-13759405
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Karthik Kambatla commented on MAPREDUCE-5418:
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bq. But AHS is on the way, so JHS could just poll AHS?
+1. Even if we try to fix it some other way before AHS is ready to be used, we
should update it to use the AHS.
> JobHistoryServer has no information about applications if the MR-AM crashes
> ---------------------------------------------------------------------------
>
> Key: MAPREDUCE-5418
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5418
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobhistoryserver, mr-am
> Affects Versions: 2.0.5-alpha
> Reporter: Karthik Kambatla
> Priority: Critical
> Attachments: JHS-web-ui.png, RM-web-ui.png
>
>
> Currently, the AM writes the job-specific information to HDFS only after it
> finishes; the JHS needs this info to display anything. If the AM fails, this
> info is not written and the JHS fails to display anything for that job.
> While JHS on top of AHS might address this issue, it would be nice to have a
> solution in the interim.
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