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https://issues.apache.org/jira/browse/HDFS-7621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14531902#comment-14531902
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Walter Su commented on HDFS-7621:
---------------------------------
{{moveBlockAcrossStorage}} requires Mover send correct {{numOfBytes}},
otherwise DN reject the command.
I'm thinking:
1. Is it necessary to check corruption when moving across storage inside DN?
2. If so, we wait HDFS-8289, so we get ECSchema from FileStatus, and calculate
{{numOfBytes}} by calling StripedBlockUtil.constructInternalBlock(..)
> 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
> Labels: HDFS-7285
> Attachments: HDFS-7621.001.patch, HDFS-7621.002.patch
>
>
> 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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