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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MAPREDUCE-1129) Assign multiple Map and Reduce tasks in Fairscheduler
Date Tue, 10 Nov 2009 07:31:28 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Todd Lipcon resolved MAPREDUCE-1129.

    Resolution: Duplicate

Resolving as duplicate since this is in MAPREDUCE-706. Regarding the backport for Cloudera's
distro, we will definitely include this in 0.20 in CDH3, and it's looking like we may backport
for CDH2 in the coming weeks as well.

> Assign multiple Map and Reduce tasks in Fairscheduler
> -----------------------------------------------------
>                 Key: MAPREDUCE-1129
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1129
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: contrib/fair-share
>    Affects Versions: 0.20.1
>            Reporter: Scott Chen
> In Hadoop-0.20, the period of heartbeat becomes much longer. 
> Fairscheduler assigns at most one Map and one Reduce task per heartbeat.
> This makes the cluster become very inefficient. Often time only half of the slots are
> One idea is that we make Fairscheduler detect this situation (cluster under used) and
scheduler more tasks in a heartbeat.
> Thoughts?

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