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https://issues.apache.org/jira/browse/HDFS-7613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14278016#comment-14278016
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Zhe Zhang commented on HDFS-7613:
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[~Fei Hu] Thank you for being interested in working on this JIRA. I think the
new placement policy should extend {{BlockPlacementPolicy}} just like
{{BlockPlacementPolicyWithNodeGroup}}.
> 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: Fei Hu
>
> 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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