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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5726) Remove pre-emption from the capacity scheduler code base
Date Mon, 04 May 2009 13:34:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12705591#action_12705591
] 

Hemanth Yamijala commented on HADOOP-5726:
------------------------------------------

bq. I'd propose we take this opportunity to further improve the capacity-scheduler by simplifying
it's design, refactoring inner-classes into standalone classes, using the JobChangeEvents
more extensively rather than re-sort queues on every heartbeat etc. Maybe a new jira?

Arun, I agree. Particularly with the refactoring of inner classes into standalone classes.
Also, I think we should look at combining all queue state into a single class and promote
it to a first class object. Today, this state is split between JobQueueManager and QueueSchedulingInfo.

Can you please open a new jira with your ideas and we can discuss there ?

> Remove pre-emption from the capacity scheduler code base
> --------------------------------------------------------
>
>                 Key: HADOOP-5726
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5726
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: contrib/capacity-sched
>            Reporter: Hemanth Yamijala
>            Assignee: rahul k singh
>         Attachments: cs-without-preemption-23-1-2009.patch
>
>
> In an effort to simplify the code base, we would like to remove the pre-emption related
code in the capacity scheduler. We would reintroduce this (possibly with some revisions to
the original design) after a while. This will be an incompatible change. Any objections ?

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