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https://issues.apache.org/jira/browse/YARN-6042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869613#comment-15869613
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Yufei Gu commented on YARN-6042:
--------------------------------

The test failures are unrelated. [~rchiang], wanna take a look?

> Fairscheduler: Dump scheduler state in log
> ------------------------------------------
>
>                 Key: YARN-6042
>                 URL: https://issues.apache.org/jira/browse/YARN-6042
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: fairscheduler
>            Reporter: Yufei Gu
>            Assignee: Yufei Gu
>         Attachments: YARN-6042.001.patch, YARN-6042.002.patch, 
> YARN-6042.003.patch, YARN-6042.004.patch, YARN-6042.005.patch, 
> YARN-6042.006.patch
>
>
> To improve the debugging of scheduler issues it would be a big improvement to 
> be able to dump the scheduler state into a log on request. 
> The Dump the scheduler state at a point in time would allow debugging of a 
> scheduler that is not hung (deadlocked) but also not assigning containers. 
> Currently we do not have a proper overview of what state the scheduler and 
> the queues are in and we have to make assumptions or guess
> The scheduler and queue state needed would include (not exhaustive):
> - instantaneous and steady fair share (app / queue)
> - AM share and resources
> - weight
> - app demand
> - application run state (runnable/non runnable)
> - last time at fair/min share



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