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https://issues.apache.org/jira/browse/YARN-2901?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Varun Vasudev updated YARN-2901:
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    Attachment: Exception expanded.jpg
                Exception collapsed.png

[~leftnoteasy]
{quote}
1) Can we have a separate table to show recent X warnings/error in addition to 
"most frequent warnings/errors"?
{quote}

You can sort by date in the table. By default, the table is sorted to show you 
the most recent errors/warnings. The counts are just a collapse so that if you 
have the same error occurring over and over again, it doesn't fill up the table.

{quote}
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.
{quote}

Uploaded a screenshots of what an exception collapsed and expanded will look 
like. Can you let me know if it looks ok? The different colors are some issue 
with the exporting.

> 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: Exception collapsed.png, Exception expanded.jpg, 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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