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https://issues.apache.org/jira/browse/MAPREDUCE-3519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13165293#comment-13165293
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Ravi Gummadi commented on MAPREDUCE-3519:
-----------------------------------------
As reads of Configuration object happen often and writes to Configuration
object don't happen often, having separate locks for read and write should
improve things a lot in terms of performance.
> Deadlock in LocalDirsHandlerService and ShuffleHandler
> ------------------------------------------------------
>
> Key: MAPREDUCE-3519
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3519
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, nodemanager
> Affects Versions: 0.23.1, 0.24.0
> Reporter: Ravi Gummadi
> Assignee: Ravi Gummadi
> Fix For: 0.23.1
>
> Attachments: 3519.patch, deadlock.txt
>
>
> MAPREDUCE-3121 cloned Configuration object in LocalDirsHandlerService.init()
> to avoid others to access that configuration object. But since it is set in
> the base class of LocalDirsHandlerService using super.init(conf), it is
> reflected and is accessible to some other services. This is causing a
> deadlock when accessing this configuration object from
> LocalDirsHandlerService and ShuffleHandler along with AllocatorPerContext
> object.
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