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From "Ashwin Shankar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6701) Make seed optional in NetworkTopology#sortByDistance
Date Fri, 18 Jul 2014 16:56:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14066516#comment-14066516

Ashwin Shankar commented on HDFS-6701:

Test failures are unrelated. HADOOP-10062,HADOOP-10510,HDFS-6624 are open jiras for some of
TestIPC and TestCallQueueManager tests pass on my laptop.

> Make seed optional in 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
>         Attachments: HDFS-6701-v1.txt
> 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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