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. -- This message was sent by Atlassian JIRA (v6.2#6252)