Thomas Graves commented on YARN-3294:

[~xgong] [~vvasudev]  I saw this show up in the UI on branch-2.  I don't see 
any permissions checks on this, am I perhaps missing it?  We don't want 
arbitrary users to be able to change log level on the RM.  They could slow it 
down and cause disks to fill up.

I also don't see an option to disable this, is there one?  If not I think we 
want it.   

Honestly I don't really see a need for this button at all as you can change in 
the logLevel app.  But since its in we atleast need to protect it and in my 
opinion disable it for normal users.

> Allow dumping of Capacity Scheduler debug logs via web UI for a fixed time 
> period
> ---------------------------------------------------------------------------------
>                 Key: YARN-3294
>                 URL: https://issues.apache.org/jira/browse/YARN-3294
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: capacityscheduler
>            Reporter: Varun Vasudev
>            Assignee: Varun Vasudev
>             Fix For: 2.8.0
>         Attachments: Screen Shot 2015-03-12 at 8.51.25 PM.png, 
> apache-yarn-3294.0.patch, apache-yarn-3294.1.patch, apache-yarn-3294.2.patch, 
> apache-yarn-3294.3.patch, apache-yarn-3294.4.patch
> It would be nice to have a button on the web UI that would allow dumping of 
> debug logs for just the capacity scheduler for a fixed period of time(1 min, 
> 5 min or so) in a separate log file. It would be useful when debugging 
> scheduler behavior without affecting the rest of the resourcemanager.

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