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https://issues.apache.org/jira/browse/YARN-5483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15412043#comment-15412043
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Daniel Templeton commented on YARN-5483:
----------------------------------------

Looks good to me.  Looks like the call to {{pullJustFinishedContainers()}} 
wasn't clearing the list of just finished containers per the method contract.  
Nice catch.

With these lines:

{code}
        finishedContainersSentToAM.putIfAbsent(nodeId,
            new ArrayList<ContainerStatus>());
{code}

can you please use the diamond operator in the list constructor and merge them 
back into one line?

> Optimize RMAppAttempt#pullJustFinishedContainers
> ------------------------------------------------
>
>                 Key: YARN-5483
>                 URL: https://issues.apache.org/jira/browse/YARN-5483
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: sandflee
>            Assignee: sandflee
>         Attachments: YARN-5483.01.patch, jprofiler-cpu.png
>
>
> about 1000 app running on cluster, jprofiler found pullJustFinishedContainers 
> cost too much cpu.



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