Vinod Kumar Vavilapalli commented on YARN-2171:

The code changes look fine enough to me.

The test is not so useful beyond validating this ticket, but that's okay. I see 
that we don't have any test validating the number of nodes itself explicitly, 
shall we add that here?

> AMs block on the CapacityScheduler lock during allocate()
> ---------------------------------------------------------
>                 Key: YARN-2171
>                 URL: https://issues.apache.org/jira/browse/YARN-2171
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 0.23.10, 2.4.0
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: YARN-2171.patch
> When AMs heartbeat into the RM via the allocate() call they are blocking on 
> the CapacityScheduler lock when trying to get the number of nodes in the 
> cluster via getNumClusterNodes.

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