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Posted to hdfs-issues@hadoop.apache.org by "Ashwin Shankar (JIRA)" <ji...@apache.org> on 2014/07/18 04:57:04 UTC

[jira] [Updated] (HDFS-6701) Make seed optional in NetworkTopology#sortByDistance

     [ https://issues.apache.org/jira/browse/HDFS-6701?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ashwin Shankar updated HDFS-6701:
---------------------------------

    Summary: Make seed optional in NetworkTopology#sortByDistance  (was: Make seed optional NetworkTopology#sortByDistance)

> 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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