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From "Matei Zaharia (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1198) Alternatively schedule different types of tasks in fair share scheduler
Date Fri, 20 Nov 2009 20:07:39 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matei Zaharia updated MAPREDUCE-1198:
-------------------------------------

      Resolution: Fixed
    Hadoop Flags: [Reviewed]
          Status: Resolved  (was: Patch Available)

> Alternatively schedule different types of tasks in fair share scheduler
> -----------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1198
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1198
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: contrib/fair-share
>    Affects Versions: 0.22.0
>            Reporter: Scott Chen
>            Assignee: Scott Chen
>             Fix For: 0.22.0
>
>         Attachments: MAPREDUCE-1198-v1.patch, MAPREDUCE-1198-v2.patch, MAPREDUCE-1198-v3.patch,
MAPREDUCE-1198-v4.patch, MAPREDUCE-1198-v5.patch
>
>
> Matei has mentioned in MAPREDUCE-961 that the current scheduler will first try to launch
map tasks until canLaunthTask() returns false then look for reduce tasks. This might starve
reduce task. He also mention that alternatively schedule different types of tasks can solve
this problem.

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