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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4359) Potential deadlock in Counters
Date Thu, 21 Jun 2012 17:27:42 GMT
Todd Lipcon created MAPREDUCE-4359:
--------------------------------------

             Summary: 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


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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