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From "Tsuyoshi OZAWA (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-2945) FSLeafQueue should hold lock before and after sorting runnableApps in assignContainer
Date Wed, 10 Dec 2014 05:25:12 GMT
Tsuyoshi OZAWA created YARN-2945:
------------------------------------

             Summary: FSLeafQueue should hold lock before and after sorting runnableApps in
assignContainer
                 Key: YARN-2945
                 URL: https://issues.apache.org/jira/browse/YARN-2945
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Tsuyoshi OZAWA
            Assignee: Tsuyoshi OZAWA


After YARN-2910, assignContainer hold WriteLock while sorting and ReadLock while referencing
runnableApps. This can cause interrupted assignment of containers regardless of the result
of policy.
{code}
    writeLock.lock();
    try {
      Collections.sort(runnableApps, comparator);
    } finally {
      writeLock.unlock();
    }
    readLock.lock();
    try {
      for (FSAppAttempt sched : runnableApps) {
        if (SchedulerAppUtils.isBlacklisted(sched, node, LOG)) {
          continue;
        }

        assigned = sched.assignContainer(node);
        if (!assigned.equals(Resources.none())) {
          break;
        }
       }
    } finally {
      readLock.unlock();
    }
{code}




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