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https://issues.apache.org/jira/browse/HDFS-7613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14370225#comment-14370225
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Zhe Zhang commented on HDFS-7613:
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This JIRA actually has a wider scope than HDFS-7891. Besides the initial target
selection (e.g., selecting 14 nodes as initial targets for the group), we also
need to select recovery targets. For example, if 1 node in the 14 targets dies,
we need to select another node to recover the data and we should avoid those
racks already hosting the group.
> 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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