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https://issues.apache.org/jira/browse/HADOOP-3386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12596669#action_12596669
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Arun C Murthy commented on HADOOP-3386:
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bq. When the job finished, JobTracker will send "KILL" job command to the
TaskTrackers, based on jobsToTracker data structure.
+1
> the job directory of a failed task may stay forever on a tasktracker node
> -------------------------------------------------------------------------
>
> Key: HADOOP-3386
> URL: https://issues.apache.org/jira/browse/HADOOP-3386
> Project: Hadoop Core
> Issue Type: Bug
> Reporter: Zheng Shao
>
> See https://issues.apache.org/jira/browse/HADOOP-3370 for details of the
> problem.
> A tasktracker only cleans out the job dir when the job tracker sends a
> "KILLJOB" action in the heartbeat response message.
> However, in a corner case, the job tracker will NOT send the "KILLJOB" action
> to the task tracker. The case is when there is only failed tasks of this job
> on this task tracker; no successful tasks of this job is on this task tracker.
> In this case, jobtracker.trackerToTaskMap will not contain an entry of this
> task tracker to any tasks of this job. As a result, the job tracker will not
> send a KILLJOB action to the task tracker.
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