[jira] [Reopened] (YARN-2901) Add errors and warning metrics page to RM, NM web UI

["Li Lu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-2901?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Li Lu reopened YARN-2901:
-------------------------

The recent commit added two findbugs warnings on my local machine and in the build of YARN-3426:
{code}

Code	Warning
UrF	Unread public/protected field: org.apache.hadoop.yarn.util.Log4jWarningErrorMetricsAppender$Element.count
UrF	Unread public/protected field: org.apache.hadoop.yarn.util.Log4jWarningErrorMetricsAppender$Element.timestampSeconds
{code}

>From git blame this JIRA is the one performed the most recent change. Reopen this JIRA to fix them. 

> 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: Varun Vasudev
>             Fix For: 2.8.0
>
>         Attachments: Exception collapsed.png, Exception expanded.jpg, Screen Shot 2015-03-19 at 7.40.02 PM.png, 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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