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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6701) Make seed optional in NetworkTopology#sortByDistance
Date Fri, 18 Jul 2014 23:42:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14067206#comment-14067206

Hadoop QA commented on HDFS-6701:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/7395//console

This message is automatically generated.

> 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
>            Assignee: Ashwin Shankar
>         Attachments: HDFS-6701-v1.txt, HDFS-6701-v3-branch2.txt, HDFS-6701-v3.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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