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Date: Thu, 19 Mar 2009 17:41:50 -0700 (PDT)
From: "Matei Zaharia (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-4788) Set
 mapred.fairscheduler.assignmultiple to true by default
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     [ https://issues.apache.org/jira/browse/HADOOP-4788?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matei Zaharia updated HADOOP-4788:
----------------------------------

    Assignee: Matei Zaharia
      Status: Patch Available  (was: Open)

> 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
>         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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