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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5199) A proposal to merge common functionality of various Schedulers
Date Mon, 09 Feb 2009 18:16:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671950#action_12671950
] 

Owen O'Malley commented on HADOOP-5199:
---------------------------------------

This may be a reasonable thought experiment, but we should never actually commit a 4th scheduler
on the path to merging schedulers....

> A proposal to merge common functionality of various Schedulers
> --------------------------------------------------------------
>
>                 Key: HADOOP-5199
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5199
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Vivek Ratan
>         Attachments: 5199.1.patch
>
>
> There are at least 3 Schedulers in Hadoop today: Default, Capacity, and Fairshare. Over
time, we're seeing a lot of functionality common to all three. Many bug fixes, improvements
to existing functionality, and new functionality are applicable to all three schedulers. This
trend seems to be getting stronger, as we notice similar problems, solutions, and ideas. This
is a proposal to detect and consolidate such common functionality, while at the same time,
allowing for differences in behavior and leaving the door open for other schedulers to be
built, as per HADOOP-3412. 

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