Tsuyoshi OZAWA commented on YARN-2328:

Had an offline discussion with Sandy. This approach of having a single 
background-tasks-thread would adversely affect continuous scheduling as that 
would be gated on a sleep and often-longer update.

Checked preview patch. It makes sense to me. Thanks for taking this issue, 

> 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, 
> yarn-2328-preview.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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