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https://issues.apache.org/jira/browse/HDFS-7613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14514615#comment-14514615
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Zhe Zhang commented on HDFS-7613:
---------------------------------

Thanks Junping for pointing out the JIRA. I agree we should use either 
HDFS-4894 or HDFS-7068 to focus on enabling per-file placement policies. If you 
have a chance, could you also take a look at the multi-policy part in this 
patch and see if that looks OK?

> 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
>         Attachments: HDFS-7613.001.patch
>
>
> 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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