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