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Posted to common-issues@hadoop.apache.org by "Robert Chansler (JIRA)" <ji...@apache.org> on 2009/10/09 06:05:31 UTC

[jira] Updated: (HADOOP-4788) Set mapred.fairscheduler.assignmultiple to true by default

     [ https://issues.apache.org/jira/browse/HADOOP-4788?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Chansler updated HADOOP-4788:
------------------------------------

    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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