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https://issues.apache.org/jira/browse/MAPREDUCE-3519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13166324#comment-13166324
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Ravi Gummadi commented on MAPREDUCE-3519:
-----------------------------------------
OK. I created HADOOP-7900 for the issue of 2 calls to conf.get() in
confChanged(). Uploaded a patch there with the suggested code change.
> 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
> Priority: Blocker
> Fix For: 0.23.1
>
> Attachments: 3519.patch, 3519.v1.patch, deadlock.txt
>
>
> MAPREDUCE-3121 cloned Configuration object in LocalDirsHandlerService.init()
> to avoid others to access that configuration object. But since it is used in
> local FileSystem object creation in LocalDirAllocator.AllocatorPerContext and
> the same FileSystem object is used in
> ShuffleHandler.Shuffle.localDirAllocator, this is causing a deadlock when
> accessing this configuration object from LocalDirsHandlerService and
> ShuffleHandler along with AllocatorPerContext object.
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