Jason Lowe commented on YARN-4371:

Normally commands intended to take multiple arguments don't use commas.  
Instead they simply are separate arguments.  For example:
yarn application -kill application_1234_0001 application_1234_0007 

The {{kill}} command on most systems doesn't take a comma-separated list of 
pids to kill, so I don't see why we would want to do differently.

> "yarn application -kill" should take multiple application ids
> -------------------------------------------------------------
>                 Key: YARN-4371
>                 URL: https://issues.apache.org/jira/browse/YARN-4371
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Tsuyoshi Ozawa
> Currently we cannot pass multiple applications to "yarn application -kill" 
> command.
> The command should take multiple application ids at the same time.
> I think it's straight forward to pass comma-separated ids if we can grant 
> application ids don't contain any commas. 

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