zhihai xu commented on YARN-2753:

Hi [~leftnoteasy],
I merged the patch in YARN-2759 into the new patch YARN-2753.003.patch because 
both patches touched same files.

> potential NPE in checkRemoveLabelsFromNode of CommonNodeLabelsManager
> ---------------------------------------------------------------------
>                 Key: YARN-2753
>                 URL: https://issues.apache.org/jira/browse/YARN-2753
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>         Attachments: YARN-2753.000.patch, YARN-2753.001.patch, 
> YARN-2753.002.patch, YARN-2753.003.patch
> potential NPE(NullPointerException) in checkRemoveLabelsFromNode of 
> CommonNodeLabelsManager.
> It because when a Node is created, Node.labels can be null.
> In this case, nm.labels; may be null.
> So we need check originalLabels not null before use 
> it(originalLabels.containsAll).

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