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https://issues.apache.org/jira/browse/HADOOP-7292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13034461#comment-13034461
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Todd Lipcon commented on HADOOP-7292:
-------------------------------------

aha, I guess I learn something new every day :)

Nonetheless since it's only used in that local scope for now, why not minimize 
it? Makes it easier to understand that it's only triggered from that thread and 
awaited from the other.

> Metrics 2 TestSinkQueue is racy
> -------------------------------
>
>                 Key: HADOOP-7292
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7292
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 0.23.0
>            Reporter: Luke Lu
>            Assignee: Luke Lu
>            Priority: Minor
>             Fix For: 0.23.0
>
>         Attachments: hadoop-7292-test-race-v1.patch
>
>
> The TestSinkQueue is racy (Thread.yield is not enough to guarantee other 
> intended thread getting run), though it's the first time (from HADOOP-7289) I 
> saw it manifested here.

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