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Still trying to understand this completely, but it seems to me that to some degree, the recommendations must be prefaced on how much memory you need to allow with: mapred.map.child.java.opts In other words, if I'm on an m2.xlarge with 17G of ram but configure for 6G per mapper to deal with supernodes then i likely can't have more than 2 mappers per instance.
https://github.com/thinkaurelius/faunus/wiki/Running-Faunus-on-Amazon-EC2#recommended-mapreduce-tasks-per-node
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