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https://issues.apache.org/jira/browse/YARN-3160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14316068#comment-14316068
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Junping Du commented on YARN-3160:
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+1. Patch looks good to me. Committing it now.
[~leftnoteasy], thanks for suggestion. However, let's do the code refactor work
separately from a bug fix here.
> Non-atomic operation on nodeUpdateQueue in RMNodeImpl
> -----------------------------------------------------
>
> Key: YARN-3160
> URL: https://issues.apache.org/jira/browse/YARN-3160
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.7.0
> Reporter: Chengbing Liu
> Assignee: Chengbing Liu
> Attachments: YARN-3160.2.patch, YARN-3160.patch
>
>
> {code:title=RMNodeImpl.java|borderStyle=solid}
> while(nodeUpdateQueue.peek() != null){
> latestContainerInfoList.add(nodeUpdateQueue.poll());
> }
> {code}
> The above code brings potential risk of adding null value to
> {{latestContainerInfoList}}. Since {{ConcurrentLinkedQueue}} implements a
> wait-free algorithm, we can directly poll the queue, before checking whether
> the value is null.
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