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https://issues.apache.org/jira/browse/YARN-1128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13770823#comment-13770823
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Sandy Ryza commented on YARN-1128:
----------------------------------
+1
> 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
> Assignee: Karthik Kambatla
> Attachments: yarn-1128-1.patch
>
>
> 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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