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https://issues.apache.org/jira/browse/MAPREDUCE-5939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14041292#comment-14041292
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Jason Lowe commented on MAPREDUCE-5939:
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Appears to have been caused by MAPREDUCE-5052. The job start time was added to
the jhist name format but the parsing behavior when that new field is missing
doesn't match the old behavior before it was added.
> StartTime showing up as the epoch time in JHS UI after upgrade
> --------------------------------------------------------------
>
> Key: MAPREDUCE-5939
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5939
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.5.0
> Reporter: Kihwal Lee
>
> After upgrading from 0.23.x to 2.5, the start time of old apps are showing up
> as the epoch time. It looks like 2.5 expects start time to be encoded at the
> end of the jhist file name (....xxxx-[timestamp].jhist). It should have been
> made backward compatible.
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