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From momina khan <momina.a...@gmail.com>
Subject data locality on HDFS
Date Fri, 07 May 2010 10:52:28 GMT

i am trying to figure out how hadoop uses data locality to schedule maps on
nodes which locally store tha map input ... going through code i am going in
circles in between a couple of file but not really getting anywhere ... that
is to say that i cant locate the HDFS API or func that can communicate a
node list that store replicas foe say a block!

i am going from FSNameSystem.java to DFSClient.java to
BlocksWithLocations.java to DataNodeDescriptor.java and then back again
without getting to the HDFS interface that communicates replicas' storing
nodes for a block!

someone plz help!

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