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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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Wangda Tan reassigned YARN-2901:
--------------------------------

    Assignee: Wangda Tan  (was: Varun Vasudev)

> Add errors and warning metrics page 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: Wangda Tan
>             Fix For: 2.8.0
>
>         Attachments: Exception collapsed.png, Exception expanded.jpg, Screen 
> Shot 2015-03-19 at 7.40.02 PM.png, YARN-2901.addendem.1.patch, 
> apache-yarn-2901.0.patch, apache-yarn-2901.1.patch, apache-yarn-2901.2.patch, 
> apache-yarn-2901.3.patch, apache-yarn-2901.4.patch, apache-yarn-2901.5.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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