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From "Matei Zaharia (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4788) Set mapred.fairscheduler.assignmultiple to true by default
Date Fri, 05 Dec 2008 20:32:44 GMT
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
            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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