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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4359) Potential deadlock in Counters
Date Tue, 26 Jun 2012 13:33:44 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Tom White updated MAPREDUCE-4359:

    Attachment: MAPREDUCE-4359.patch

Here's a patch to impose a fixed lock acquisition order (Counters then Group), which removes
the jcarder warning. 
> 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
>         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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