Wangda Tan commented on YARN-2901:

[~vvasudev], It's a great add-on to RM web UI, with this, we don't need access 
RM log every time. Love the proposal :)

Some suggestions about UI:
1) Can we have a separate table to show recent X warnings/error in addition to 
"most frequent warnings/errors"?
2) Is it possible to get exception stack trace as a part of the warnings/errors 
page. Sometimes stack trace is not a part of warn/error, but they're also very 
useful to troubleshooting issues.

> Add errors and warning stats to RM, NM web UI
> ---------------------------------------------
>                 Key: YARN-2901
>                 URL: https://issues.apache.org/jira/browse/YARN-2901
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: nodemanager, resourcemanager
>            Reporter: Varun Vasudev
>            Assignee: Varun Vasudev
>         Attachments: Screen Shot 2015-03-19 at 7.40.02 PM.png, 
> apache-yarn-2901.0.patch
> It would be really useful to have statistics on the number of errors and 
> warnings in the RM and NM web UI. I'm thinking about -
> 1. The number of errors and warnings in the past 5 min/1 hour/12 hours/day
> 2. The top 'n'(20?) most common exceptions in the past 5 min/1 hour/12 
> hours/day
> By errors and warnings I'm referring to the log level.
> I suspect we can probably achieve this by writing a custom appender?(I'm open 
> to suggestions on alternate mechanisms for implementing this).

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