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https://issues.apache.org/jira/browse/HDFS-7613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14317440#comment-14317440
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Jing Zhao commented on HDFS-7613:
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Thanks for sharing the thoughts, [~walter.k.su]! I think we should start from
the 2nd policy since in our first phase we only do RS and striped blocks. Each
block contained in a block group (or BlockInfoStriped in the current code) only
has one replica.
> Block placement policy for erasure coding groups
> ------------------------------------------------
>
> Key: HDFS-7613
> URL: https://issues.apache.org/jira/browse/HDFS-7613
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Zhe Zhang
> Assignee: Walter Su
>
> Blocks in an erasure coding group should be placed in different failure
> domains -- different DataNodes at the minimum, and different racks ideally.
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