[jira] [Created] (YARN-1128) FifoPolicy.computeShares throws NPE on empty list of Schedulables

["Sandy Ryza (JIRA)" <ji...@apache.org>]

Sandy Ryza created YARN-1128:
--------------------------------

             Summary: FifoPolicy.computeShares throws NPE on empty list of Schedulables
                 Key: YARN-1128
                 URL: https://issues.apache.org/jira/browse/YARN-1128
             Project: Hadoop YARN
          Issue Type: Bug
          Components: scheduler
    Affects Versions: 2.1.0-beta
            Reporter: Sandy Ryza


FifoPolicy gives all of a queue's share to the earliest-scheduled application.

{code}
    Schedulable earliest = null;
    for (Schedulable schedulable : schedulables) {
      if (earliest == null ||
          schedulable.getStartTime() < earliest.getStartTime()) {
        earliest = schedulable;
      }
    }
    earliest.setFairShare(Resources.clone(totalResources));
{code}

If the queue has no schedulables in it, earliest will be left null, leading to an NPE on the last line.

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