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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4371) "yarn application -kill" should take multiple application ids
Date Mon, 11 Jan 2016 22:23:39 GMT

    [ https://issues.apache.org/jira/browse/YARN-4371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15092806#comment-15092806
] 

Jason Lowe commented on YARN-4371:
----------------------------------

It's not very helpful to say "Application doesn't exist in RM." and not report which one(s)
they are.  If someone was looking at this exception it would be lacking critical info.  Since
the caller is simply ignoring the exception anyway, wouldn't it be simpler to just have the
kill code ignore the missing applications and remove the try clause from the caller?

I think there's also an issue where the user can specify multiple arguments and the command
will silently ignore their requests.  For example:
{{yarn application -appStates RUNNING -kill app1 app2 app3}}

Since we're no longer checking for a specific number of arguments, I think the user can throw
in all sorts of other options that will be silently ignored, probably to the surprise of the
user.

Side note: it's a little weird to see app IDs as direct arguments to the kill option.  In
typical UNIX command-line processing the kill option would simply be a boolean flag option
with no associated value, and the non-option arguments at the end of the command-line would
be the application IDs to process based on the previous options specified, hence why space-separated
is what I would expect for that app list.  Not a must-fix, I just find it odd.

> "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
>            Assignee: Sunil G
>         Attachments: 0001-YARN-4371.patch, 0002-YARN-4371.patch, 0003-YARN-4371.patch
>
>
> Currently we cannot pass multiple applications to "yarn application -kill" command. The
command should take multiple application ids at the same time. 
> Each entries should be separated with whitespace like:
> {code}
> yarn application -kill application_1234_0001 application_1234_0007 application_1234_0012
> {code}



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