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https://issues.apache.org/jira/browse/MAPREDUCE-4359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13401462#comment-13401462
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Todd Lipcon commented on MAPREDUCE-4359:
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Patch looks good to me. If this is in trunk we should do a trunk patch at the
same time, though.
> Potential deadlock in Counters
> ------------------------------
>
> Key: MAPREDUCE-4359
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4359
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 1.0.3
> Reporter: Todd Lipcon
> Assignee: Tom White
> Attachments: 1_jcarder_result_0.dot.png, MAPREDUCE-4359.patch
>
>
> jcarder identified this deadlock in branch-1 (though it may also be present
> in trunk):
> - Counters.size() is synchronized and locks Counters before Group
> - Counters.Group.getCounterForName() is synchronized and calls through to
> Counters.size()
> This creates a potential cycle which could cause a deadlock (though probably
> quite rare in practice)
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