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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2016) Race condition in removing a KILLED task from tasktracker
Date Thu, 11 Oct 2007 18:09:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12534111

Owen O'Malley commented on HADOOP-2016:

+1, although moving the logging line up seems more confusing than helpful.

> 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
>            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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