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https://issues.apache.org/jira/browse/HADOOP-4924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12659140#action_12659140
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dhruba borthakur commented on HADOOP-4924:
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It would be nice if somebody can comment if this affects 0.17 and 0.18 as well.
> Race condition in re-init of TaskTracker
> ----------------------------------------
>
> Key: HADOOP-4924
> URL: https://issues.apache.org/jira/browse/HADOOP-4924
> Project: Hadoop Core
> Issue Type: Bug
> Reporter: Devaraj Das
> Assignee: Devaraj Das
> Priority: Blocker
> Fix For: 0.20.0
>
> Attachments: 4924.patch
>
>
> The taskReportServer is stopped in the TaskTracker.close() method in a
> thread. The race condition is:
> 1) TaskTracker.close() is invoked - this starts a thread to stop the
> taskReportServer
> 2) TaskTracker.initialize is invoked - this tries to create a new
> taskReportServer
> Assume that the thread started to stop the taskReportServer gets to start its
> work after (2) above. The thread will end up stopping the newly created
> taskReportServer.
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