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https://issues.apache.org/jira/browse/HADOOP-5199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672153#action_12672153
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Vivek Ratan commented on HADOOP-5199:
-------------------------------------
If there is an apprehension of adding the {{HadoopScheduler}} class into the
framework, we can also consider replacing TaskScheduler's assignTasks() with
HadooPScheduler's assignTasks() and getting rid of {{HadoopScheduler}}. This
wudl mean moving the common code to {{TaskScheduler}}, but still allowing a
subclass of {{TaskScheduler}} to overwrite assignTasks() with their own
implementation.
> 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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