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https://issues.apache.org/jira/browse/YARN-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14073687#comment-14073687
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Karthik Kambatla commented on YARN-2328:
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As per the discussion on YARN-2313, it might be better to have a single thread
run all background tasks so that we guarantee the foreground tasks have a
dedicated chunk of time with no thread holding a lock on the FairScheduler
which is the smallest of these tasks' periods.
> FairScheduler: Verify update and continuous scheduling threads are stopped
> when the scheduler is stopped
> --------------------------------------------------------------------------------------------------------
>
> Key: YARN-2328
> URL: https://issues.apache.org/jira/browse/YARN-2328
> Project: Hadoop YARN
> Issue Type: Improvement
> Affects Versions: 2.4.1
> Reporter: Karthik Kambatla
> Assignee: Karthik Kambatla
> Priority: Minor
> Attachments: yarn-2328-1.patch, yarn-2328-2.patch, yarn-2328-2.patch
>
>
> FairScheduler threads can use a little cleanup and tests. To begin with, the
> update and continuous-scheduling threads should extend Thread and handle
> being interrupted. We should have tests for starting and stopping them as
> well.
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