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https://issues.apache.org/jira/browse/MAPREDUCE-1316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12799115#action_12799115
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Arun C Murthy commented on MAPREDUCE-1316:
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I took a quick look, the patch looks reasonable - I'll spend some more time on
it tmrw.
> JobTracker holds stale references to retired jobs via unreported tasks
> -----------------------------------------------------------------------
>
> Key: MAPREDUCE-1316
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1316
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Reporter: Amar Kamat
> Assignee: Amar Kamat
> Priority: Blocker
> Attachments: mapreduce-1316-v1.11.patch, mapreduce-1316-v1.7.patch
>
>
> JobTracker fails to remove _unreported_ tasks' mapping from _taskToTIPMap_ if
> the job finishes and retires. _Unreported tasks_ refers to tasks that were
> scheduled but the tasktracker did not report back with the task status. In
> such cases a stale reference is held to TaskInProgress (and thus
> JobInProgress) long after the job is gone leading to memory leak.
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