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From "Ashwin Shankar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6701) Make seed optional NetworkTopology#sortByDistance
Date Fri, 18 Jul 2014 02:51:05 GMT
Ashwin Shankar created HDFS-6701:
------------------------------------

             Summary: Make seed optional NetworkTopology#sortByDistance
                 Key: HDFS-6701
                 URL: https://issues.apache.org/jira/browse/HDFS-6701
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: namenode
    Affects Versions: 2.5.0
            Reporter: Ashwin Shankar


Currently seed in NetworkTopology#sortByDistance is set to the blockid which causes the RNG
to generate same pseudo random order for each block. If no node local block location is present,this
causes the same rack local replica to be hit for a particular block.
It'll be good to make the seed optional, so that one could turn it off if they want block
locations of a block to be randomized.



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