[jira] [Updated] (YARN-6042) Fairscheduler: Dump scheduler state in log

["Yufei Gu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-6042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yufei Gu updated YARN-6042:
---------------------------
    Attachment: YARN-6042.001.patch

> 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
>
>
> 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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