Wangda Tan commented on YARN-4225:

Thanks [~eepayne],
bq. The use case is a newer client is querying an older server...
I'm wondering if this is a valid use case: IMHO, rolling upgrade should be 
always server-first. If we plan support newer client talks to older server, we 
may experience many issues AND we need to add this to Hadoop's code 
compatibility policy.

> Add preemption status to yarn queue -status for capacity scheduler
> ------------------------------------------------------------------
>                 Key: YARN-4225
>                 URL: https://issues.apache.org/jira/browse/YARN-4225
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacity scheduler, yarn
>    Affects Versions: 2.7.1
>            Reporter: Eric Payne
>            Assignee: Eric Payne
>            Priority: Minor
>         Attachments: YARN-4225.001.patch, YARN-4225.002.patch, 
> YARN-4225.003.patch

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