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https://issues.apache.org/jira/browse/MAPREDUCE-4463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421836#comment-13421836
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Tom White commented on MAPREDUCE-4463:
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Arun, I've seen an occasional race where the TT reinit actually causes
removeTaskFromJob() to be called just _after_ the equivalent recovered TIP has
started, so the new TIP is erroneously removed from rjob.tasks. This code
protects from that happening. Does that sound reasonable?
> JobTracker recovery fails with HDFS permission issue
> ----------------------------------------------------
>
> Key: MAPREDUCE-4463
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4463
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv1
> Affects Versions: 1.2.0
> Reporter: Tom White
> Assignee: Tom White
> Attachments: MAPREDUCE-4463.patch, MAPREDUCE-4463.patch
>
>
> Recovery fails when the job user is different to the JT owner (i.e. on
> anything bigger than a pseudo-distributed cluster).
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