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From "Ben Clay" <rbc...@ncsu.edu>
Subject HDFS load balancing for non-local reads
Date Thu, 05 Jan 2012 21:40:15 GMT


How does the NameNode handle load balancing of non-local reads with multiple
block locations when locality is equal?


IE, if the client is equidistant (same rack) from 2 DataNodes hosting the
same block, does the NameNode consider current client count or any other
load indicators when deciding which DataNode will satisfy the read request?
Or, is the client provided a list of all split locations and is allowed to
make this choice themselves?






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