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https://issues.apache.org/jira/browse/YARN-6042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15903960#comment-15903960
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Yufei Gu commented on YARN-6042:
--------------------------------
Thanks [~rchiang] for the review. Right now the default update interval is
0.5s. And we already have {{UPDATE_DEBUG_FREQUENCY}} to output debug message
less frequently. Right now {{UPDATE_DEBUG_FREQUENCY}} is 5, which means every
0.5 * 5 s, there is a state dump. I increased it to 25 in patch v10. So FS
dumps its state every 12.5s.
> Dump scheduler and queue state information into FairScheduler DEBUG 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, YARN-6042.007.patch, YARN-6042.008.patch,
> YARN-6042.009.patch, YARN-6042.010.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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