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https://issues.apache.org/jira/browse/HDFS-1052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851650#action_12851650
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Sanjay Radia commented on HDFS-1052:
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Do you mean initial implementation or first patch?
The client protocol to the DNs needs to include the block pool id if the DNs 
manage multiple block pools. 
We should change all wire protocols to include the
block pool id and have the NN simply set the block pool id to zero in the reply 
to getBlockLocations().


> HDFS scalability with multiple namenodes
> ----------------------------------------
>
>                 Key: HDFS-1052
>                 URL: https://issues.apache.org/jira/browse/HDFS-1052
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>         Attachments: Block pool proposal.pdf
>
>
> HDFS currently uses a single namenode that limits scalability of the cluster. 
> This jira proposes an architecture to scale the nameservice horizontally 
> using multiple namenodes.

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