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From "Walter Su (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7621) Erasure Coding: update the Balancer/Mover data migration logic
Date Tue, 21 Apr 2015 08:26:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14504588#comment-14504588
] 

Walter Su commented on HDFS-7621:
---------------------------------

I'm still reading the code, and thinking how to do it. By the way, I found a bug in balancer.
HDFS-8204

> Erasure Coding: update the Balancer/Mover data migration logic
> --------------------------------------------------------------
>
>                 Key: HDFS-7621
>                 URL: https://issues.apache.org/jira/browse/HDFS-7621
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Jing Zhao
>            Assignee: Walter Su
>
> Currently the Balancer/Mover only considers the distribution of replicas of the same
block during data migration: the migration cannot decrease the number of racks. With EC the
Balancer and Mover should also take into account the distribution of blocks belonging to the
same block group.



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