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https://issues.apache.org/jira/browse/OOZIE-3160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16540110#comment-16540110
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Hadoop QA commented on OOZIE-3160:
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PreCommit-OOZIE-Build started


> PriorityDelayQueue put()/take() can cause significant CPU load due to busy 
> waiting
> ----------------------------------------------------------------------------------
>
>                 Key: OOZIE-3160
>                 URL: https://issues.apache.org/jira/browse/OOZIE-3160
>             Project: Oozie
>          Issue Type: Bug
>          Components: core
>         Environment: all platforms
>            Reporter: jj
>            Assignee: Peter Bacsko
>            Priority: Major
>         Attachments: 11111111111111.png, 222222222222222222.png, 
> OOZIE-3160-POC01.patch, OOZIE-3160-POC02.patch, PriorityDelayQueue 
> improvement - OOZIE-3160.pdf
>
>
> oozie process always  consume  high cpu. in my mechine,around 10%. 
> I check the source code,find take() method in PriorityDelayQueue class。
> code:
> {code:java}
> public QueueElement<E> take() throws InterruptedException {
>     QueueElement<E> e = poll();
>     while (e == null) {
>         Thread.sleep(10);
>         e = poll();
>     }
>     return e;
> }
> {code}
> i think it's the reason of this problem. it's keep while, not await.  



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