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Posted to yarn-issues@hadoop.apache.org by "Tao Jie (JIRA)" <ji...@apache.org> on 2017/03/03 07:57:45 UTC
[jira] [Commented] (YARN-6042) Dump scheduler and queue state
information into FairScheduler DEBUG log
[ https://issues.apache.org/jira/browse/YARN-6042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15893880#comment-15893880 ]
Tao Jie commented on YARN-6042:
-------------------------------
Hi [~yufeigu], dumping scheduler/queue state is very useful to detect scheduling problem at run-time. It seems to me that you try write scheduler/queue information to log file. How about print this information on the webui, just like we can get server stacks by a link.
> 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
>
>
> 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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