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https://issues.apache.org/jira/browse/HADOOP-5330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12676873#action_12676873
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Amareshwari Sriramadasu commented on HADOOP-5330:
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Are you seeing Zombie processes around? Then, yes it is HADOOP-5247.
But if you are seeing no processes running and just tasktracker says it is
running tasks, it is HADOOP-5269. Also a couple of race conditions got fixed in
HADOOP-5233. All these will be ported to branch 0.19.2.
> Zombie tasks remain after jobs finish/fail/get killed
> -----------------------------------------------------
>
> Key: HADOOP-5330
> URL: https://issues.apache.org/jira/browse/HADOOP-5330
> Project: Hadoop Core
> Issue Type: Bug
> Affects Versions: 0.19.1
> Reporter: Nathan Marz
>
> I'm seeing a lot of "task attempts" around our hadoop cluster for jobs that
> are no longer around. The attempts seem to be "hung", as they sit there
> forever. Additionally, they seem to take up map and reduce slots in the
> cluster unless MapReduce is restarted. This causes real jobs to be unable to
> utilize the whole cluster.
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