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From "Sunil G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4091) Improvement: Introduce more debug/diagnostics information to detail out scheduler activity
Date Fri, 25 Sep 2015 14:10:04 GMT

    [ https://issues.apache.org/jira/browse/YARN-4091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14908065#comment-14908065
] 

Sunil G commented on YARN-4091:
-------------------------------

No problem. Thank you [~leftnoteasy] for sharing the thoughts.
bq.I think we can only store the next allocation data once request received,
Perfect. This will also help in putting less load on memory.

As we are almost fine with the approach, I feel I could come up with a prototype here. Is
it ok or good enough to start with?

> Improvement: Introduce more debug/diagnostics information to detail out scheduler activity
> ------------------------------------------------------------------------------------------
>
>                 Key: YARN-4091
>                 URL: https://issues.apache.org/jira/browse/YARN-4091
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: capacity scheduler, resourcemanager
>    Affects Versions: 2.7.0
>            Reporter: Sunil G
>            Assignee: Sunil G
>         Attachments: Improvement on debugdiagnostic information - YARN.pdf
>
>
> As schedulers are improved with various new capabilities, more configurations which tunes
the schedulers starts to take actions such as limit assigning containers to an application,
or introduce delay to allocate container etc. 
> There are no clear information passed down from scheduler to outerworld under these various
scenarios. This makes debugging very tougher.
> This ticket is an effort to introduce more defined states on various parts in scheduler
where it skips/rejects container assignment, activate application etc. Such information will
help user to know whats happening in scheduler.
> Attaching a short proposal for initial discussion. We would like to improve on this as
we discuss.



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