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From "Sengupta, Sohini IN BLR SISL" <>
Subject meanshift reduce task problem
Date Wed, 22 Jun 2011 11:45:09 GMT

I have programmatically specified setNumReduceTasks(16) in On
execution the number of reducers is being set correctly (i.e. 16 as visible on jobtracker
screen)  but on digging deeper I see that one node has maximum number of bytes to process
and it is nominal for rest of the nodes. Hence the reduce phase is very slow after 98% completion.

I am trying this on a cluster of 18 nodes. I also see that load is distributed evenly in map
phase but not in reduce. This is happening on 0.4 and 0.5 versions of Mahout. Has anyone faced
such a problem and how to get around it?
Thanks a lot in advance,

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