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https://issues.apache.org/jira/browse/HDFS-7891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14358518#comment-14358518
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Walter Su commented on HDFS-7891:
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Thanks for noticing. BlockPlacementPolicyDefault already ensures that each Node
has one replica at most. I open this jira to try to ensures that each rack has
one replica at most. If we short of racks, We want to place replicas on racks
evenly. I think it will work, on ec files.
> a block placement policy with best fault tolerance
> --------------------------------------------------
>
> Key: HDFS-7891
> URL: https://issues.apache.org/jira/browse/HDFS-7891
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Walter Su
> Assignee: Walter Su
> Attachments: HDFS-7891.patch
>
>
> a block placement policy tries its best to place replicas to most racks.
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