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https://issues.apache.org/jira/browse/HADOOP-4788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12688571#action_12688571
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Chris Douglas commented on HADOOP-4788:
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bq. Please update the changelog
Nevermind. Done.
> Set mapred.fairscheduler.assignmultiple to true by default
> ----------------------------------------------------------
>
> Key: HADOOP-4788
> URL: https://issues.apache.org/jira/browse/HADOOP-4788
> Project: Hadoop Core
> Issue Type: Improvement
> Components: contrib/fair-share
> 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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