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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1474) Make schedulers services
Date Wed, 28 May 2014 17:15:04 GMT

    [ https://issues.apache.org/jira/browse/YARN-1474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14011331#comment-14011331
] 

Karthik Kambatla commented on YARN-1474:
----------------------------------------

I think that is the step in the right direction. I agree it is a change in semantics. Might
be a good idea to see what others think.

[~sandyr], [~vinodkv] - do you guys think it is okay to change the semantics on how a scheduler
is used:
- Before this patch, we create a scheduler and call reinitialize().
- After this patch, I am proposing scheduler.setRMContext(), scheduler.init(), and then scheduler.reinitialize()
for later updates to allocation-files etc.

Scheduler initialization is within the RM, and we haven't exposed the scheduler API for users
to write custom schedulers yet. 

> Make schedulers services
> ------------------------
>
>                 Key: YARN-1474
>                 URL: https://issues.apache.org/jira/browse/YARN-1474
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: scheduler
>    Affects Versions: 2.3.0, 2.4.0
>            Reporter: Sandy Ryza
>            Assignee: Tsuyoshi OZAWA
>         Attachments: YARN-1474.1.patch, YARN-1474.10.patch, YARN-1474.11.patch, YARN-1474.12.patch,
YARN-1474.13.patch, YARN-1474.14.patch, YARN-1474.15.patch, YARN-1474.16.patch, YARN-1474.17.patch,
YARN-1474.2.patch, YARN-1474.3.patch, YARN-1474.4.patch, YARN-1474.5.patch, YARN-1474.6.patch,
YARN-1474.7.patch, YARN-1474.8.patch, YARN-1474.9.patch
>
>
> Schedulers currently have a reinitialize but no start and stop.  Fitting them into the
YARN service model would make things more coherent.



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