Karthik Kambatla updated YARN-4526:
    Attachment: yarn-4526-2.patch

> Make SystemClock singleton so AppSchedulingInfo could use it
> ------------------------------------------------------------
>                 Key: YARN-4526
>                 URL: https://issues.apache.org/jira/browse/YARN-4526
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: scheduler
>    Affects Versions: 2.8.0
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: yarn-4526-1.patch, yarn-4526-2.patch
> To track the time a request is received, we need to get current system time. 
> For better testability of this, we are likely better off using a Clock 
> instance that uses SystemClock by default. Instead of creating umpteen 
> instances of SystemClock, we should just reuse the same instance. 

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