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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