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Date: Fri, 5 Dec 2008 12:32:44 -0800 (PST)
From: "Matei Zaharia (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Created: (HADOOP-4788) Set
 mapred.fairscheduler.assignmultiple to true by default
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Set mapred.fairscheduler.assignmultiple to true by default
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                 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
            Priority: Trivial


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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