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https://issues.apache.org/jira/browse/HADOOP-4788?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Chansler updated HADOOP-4788:
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Release Note: (was: Fair scheduler assigns both a map and a reduce on
each heartbeat by default (HADOOP-4788).)
Editorial pass over all release notes prior to publication of 0.21. Routine.
> Set mapred.fairscheduler.assignmultiple to true by default
> ----------------------------------------------------------
>
> Key: HADOOP-4788
> URL: https://issues.apache.org/jira/browse/HADOOP-4788
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Matei Zaharia
> Assignee: Matei Zaharia
> Priority: Trivial
> Fix For: 0.21.0
>
> Attachments: hadoop-4788-v0.patch
>
>
> Pretty much all users of the fair scheduler are using the "assignmultiple"
> feature which lets it launch reduce tasks at the same time as map tasks (on
> the same heartbeats), leading to reduces starting faster. This is also going
> to happen in Hadoop by default in HADOOP-3136. So we should set it to true by
> default and perhaps even remove the config parameter.
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