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From "Vivek Ratan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5199) A proposal to merge common functionality of various Schedulers
Date Tue, 10 Feb 2009 02:38:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672130#action_12672130

Vivek Ratan commented on HADOOP-5199:

This isn't meant to be a 4th scheduler. The idea was to just have one scheduler, with two
different sorting orders for jobs. If you have this, you don't need the separate Fairshare
and Capacity Scheduler projects. 

> 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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