Daniel Templeton updated YARN-5694:
    Attachment: YARN-5694.branch-2.7.002.patch

These patches make the verify status thread non-optional and also resolve a 
locking issue when stopping the service.  I'm not sure what to do about tests 

> ZKRMStateStore should only start its verification thread when in HA failover 
> is not embedded
> --------------------------------------------------------------------------------------------
>                 Key: YARN-5694
>                 URL: https://issues.apache.org/jira/browse/YARN-5694
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Daniel Templeton
>            Assignee: Daniel Templeton
>         Attachments: YARN-5694.001.patch, YARN-5694.002.patch, 
> YARN-5694.branch-2.7.001.patch, YARN-5694.branch-2.7.002.patch
> There are two cases.  In branch-2.7, the 
> {{ZKRMStateStore.VerifyActiveStatusThread}} is always started, even when 
> using embedded or Curator failover.  In branch-2.8, the 
> {{ZKRMStateStore.VerifyActiveStatusThread}} is only started when HA is 
> disabled, which makes no sense.  Based on the JIRA that introduced that 
> change (YARN-4559), I believe the intent was to start it only when embedded 
> failover is disabled.

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