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https://issues.apache.org/jira/browse/YARN-2753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14191173#comment-14191173
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zhihai xu commented on YARN-2753:
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Hi [~xgong],
since [~leftnoteasy] agreed to my patch(YARN-2756 is discussed separately) and
also the patch passed Hadoop QA, Could you review/commit the patch?
thanks
zhihai
> Fix potential issues and code clean up for *NodeLabelsManager
> -------------------------------------------------------------
>
> 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, YARN-2753.004.patch,
> YARN-2753.005.patch
>
>
> Issues include:
> * CommonNodeLabelsManager#addToCluserNodeLabels should not change the value
> in labelCollections if the key already exists otherwise the Label.resource
> will be changed(reset).
> * potential NPE(NullPointerException) in checkRemoveLabelsFromNode of
> CommonNodeLabelsManager.
> ** 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).
> * addToCluserNodeLabels should be protected by writeLock in
> RMNodeLabelsManager.java. because we should protect labelCollections in
> RMNodeLabelsManager.
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