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From "Wei Yan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-2526) Scheduler Load Simulator may enter deadlock if lots of applications submitted to the RM at the same time
Date Tue, 09 Sep 2014 16:19:28 GMT
Wei Yan created YARN-2526:
-----------------------------

             Summary: Scheduler Load Simulator may enter deadlock if lots of applications
submitted to the RM at the same time
                 Key: YARN-2526
                 URL: https://issues.apache.org/jira/browse/YARN-2526
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Wei Yan
            Assignee: Wei Yan


The simulation may enter deadlock if all application simulators hold all threads provided
by the thread pool, and all wait for AM container allocation. In that case, all AM simulators
wait for NM simulators to do heartbeat to allocate resource, and all NM simulators wait for
AM simulators to release some threads. The simulator is deadlocked.

To solve this deadlock, need to remove the while() loop in the MRAMSimulator.
{code}
    // waiting until the AM container is allocated
    while (true) {
      if (response != null && ! response.getAllocatedContainers().isEmpty()) {
        // get AM container
        .....
        break;
      }
      // this sleep time is different from HeartBeat
      Thread.sleep(1000);
      // send out empty request
      sendContainerRequest();
      response = responseQueue.take();
    }
{code}



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