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

["Karthik Kambatla (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-1128?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Karthik Kambatla reassigned YARN-1128:
--------------------------------------

    Assignee: Karthik Kambatla
    
> 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
>
> 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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