[jira] Updated: (HADOOP-4943) fair share scheduler does not utilize all slots if the task trackers are configured heterogeneously

["Matei Zaharia (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-4943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matei Zaharia updated HADOOP-4943:
----------------------------------

    Attachment: hadoop-4943-2.patch

Here's a patch that includes a unit test.

> 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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