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https://issues.apache.org/jira/browse/MAPREDUCE-1497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12834146#action_12834146
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Chris Douglas commented on MAPREDUCE-1497:
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{{IndexCache}} is threadsafe. Any synchronization should be for the protection
of other data structures in the block.
> TaskTracker.indexCache is incorrectly synchronized
> --------------------------------------------------
>
> Key: MAPREDUCE-1497
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1497
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Reporter: Amareshwari Sriramadasu
> Fix For: 0.22.0
>
>
> TaskTracker.indexCache is incorrectly synchronized.
> It is not accessed synchronously from MapOutputServlet.doGet,
> TaskCleanupThread and TaskTracker.killOverflowingTasks() method. Other
> callers access it synchronously.
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