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Date: Tue, 22 Jul 2014 17:50:41 +0000 (UTC)
From: "Andrew Wang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12728114.1405651862657.21448.1406051441380@arcas>
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Subject: [jira] [Updated] (HDFS-6701) Make seed optional in
 NetworkTopology#sortByDistance
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     [ https://issues.apache.org/jira/browse/HDFS-6701?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Wang updated HDFS-6701:
------------------------------

       Resolution: Fixed
    Fix Version/s: 2.6.0
           Status: Resolved  (was: Patch Available)

Committed to trunk and branch-2, thanks for your efforts here Ashwin!

> 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
>             Fix For: 2.6.0
>
>         Attachments: HDFS-6701-v1.txt, HDFS-6701-v3-branch2.txt, HDFS-6701-v3.txt, HDFS-6701-v4-branch2.txt, HDFS-6701-v4.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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