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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2016) Race condition in removing a KILLED task from tasktracker
Date Tue, 09 Oct 2007 17:31:51 GMT
Race condition in removing a KILLED task from tasktracker
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                 Key: HADOOP-2016
                 URL: https://issues.apache.org/jira/browse/HADOOP-2016
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
            Reporter: Devaraj Das
            Priority: Critical
             Fix For: 0.15.0


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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