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From Felix.徐 <ygnhz...@gmail.com>
Subject Policies for placing a reducer
Date Tue, 16 Jul 2013 03:55:24 GMT
Hi all,

What is the policy of choosing a node for a reducer in mapreduce (Hadoop
v1.2.0)?
For example,
If a cluster has 5 slaves, each slave can serve 2 maps and 2 reduces ,
there is a job who occupies 5 mappers and 3 reducers , how does the
jobtracker assign reducers to these nodes (choosing free slaves or placing
reducers close to mappers)?

Thanks.

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