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.
    // waiting until the AM container is allocated
    while (true) {
      if (response != null && ! response.getAllocatedContainers().isEmpty()) {
        // get AM container
      // this sleep time is different from HeartBeat
      // send out empty request
      response = responseQueue.take();

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