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https://issues.apache.org/jira/browse/HADOOP-4943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12663037#action_12663037
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Zheng Shao commented on HADOOP-4943:
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+1. Looks good to me.
Do you want to fix the default scheduler (as you mentioned above) in the same
transaction?
> fair share scheduler does not utilize all slots if the task trackers are
> configured heterogeneously
> ---------------------------------------------------------------------------------------------------
>
> Key: HADOOP-4943
> URL: https://issues.apache.org/jira/browse/HADOOP-4943
> Project: Hadoop Core
> Issue Type: Bug
> Components: contrib/fair-share
> Affects Versions: 0.19.0
> Reporter: Zheng Shao
> Assignee: Zheng Shao
> Fix For: 0.19.1
>
> Attachments: HADOOP-4943-1.patch, hadoop-4943-2.patch
>
>
> There is some code in the fairshare scheduler that tries to make the load
> across the whole cluster the same.
> That piece of code will break if the task trackers are configured
> differently. Basically, we will stop assigning more tasks to tasks trackers
> that have tasks above the cluster average, but we may still want to do that
> because other task trackers may have less slots.
> We should change the code to maintain a cluster-wide slot usage percentage
> (instead of absolute number of slot usage) to make sure the load is evenly
> distributed.
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