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Posted to yarn-dev@hadoop.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2013/01/09 00:28:13 UTC

[jira] [Created] (YARN-325) RM CapacityScheduler can deadlock when getQueueInfo() is called and a container is completing

Jason Lowe created YARN-325:
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             Summary: RM CapacityScheduler can deadlock when getQueueInfo() is called and a container is completing
                 Key: YARN-325
                 URL: https://issues.apache.org/jira/browse/YARN-325
             Project: Hadoop YARN
          Issue Type: Bug
          Components: capacityscheduler
    Affects Versions: 0.23.5, 2.0.2-alpha
            Reporter: Jason Lowe
            Priority: Critical


If a client calls getQueueInfo on a parent queue (e.g.: the root queue) and containers are completing then the RM can deadlock.  getQueueInfo() locks the ParentQueue and then calls the child queues' getQueueInfo() methods in turn.  However when a container completes, it locks the LeafQueue then calls back into the ParentQueue.  When the two mix, it's a recipe for deadlock.

Stacktrace to follow.

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