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https://issues.apache.org/jira/browse/HADOOP-2016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12534525
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Hudson commented on HADOOP-2016:
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Integrated in Hadoop-Nightly #270 (See
[http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/270/])
> Race condition in removing a KILLED task from tasktracker
> ---------------------------------------------------------
>
> Key: HADOOP-2016
> URL: https://issues.apache.org/jira/browse/HADOOP-2016
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.14.2
> Reporter: Devaraj Das
> Assignee: Arun C Murthy
> Priority: Blocker
> Fix For: 0.15.0
>
> Attachments: HADOOP-2016_20071011.patch, HADOOP-2016_2_20071011.patch
>
>
> I ran into a situation where a speculative task was killed by the JobTracker
> and the relevant TaskTracker got the right KillTaskAction, but the
> tasktracker continued to hold a reference to that task (although the task jvm
> was killed). The task continued to be in RUNNING state in both the JobTracker
> and that TaskTracker for ever. I suspect there is some race condition in
> reading/updating datastructures inside the taskCleanupThread &
> transmitHeartBeat.
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