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https://issues.apache.org/jira/browse/HDFS-1632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12998529#comment-12998529
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Suresh Srinivas commented on HDFS-1632:
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Todd, we plan to do that for all the jiras. In this case most of what is 
implemented is from the attached design document.

> HDFS Federation: data node storage structure changes and introduce block pool 
> storage for Federation. 
> ------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1632
>                 URL: https://issues.apache.org/jira/browse/HDFS-1632
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: data-node
>    Affects Versions: Federation Branch
>            Reporter: Tanping Wang
>            Assignee: Tanping Wang
>             Fix For: Federation Branch
>
>         Attachments: Federation-upgrade.htm, HDFS-1632.patch
>
>
> In Federation, we introduced block pool into HDFS.  We are making changes to 
> data node storage and and block pool storage.

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