[
https://issues.apache.org/jira/browse/MAPREDUCE-1129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12775347#action_12775347
]
Matei Zaharia commented on MAPREDUCE-1129:
------------------------------------------
Todd, are you guys also doing a backport for vanilla (Apache) Hadoop 0.20?
> 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 used.
> One idea is that we make Fairscheduler detect this situation (cluster under
> used) and scheduler more tasks in a heartbeat.
> Thoughts?
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
