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https://issues.apache.org/jira/browse/HDFS-4987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13752128#comment-13752128
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Junping Du commented on HDFS-4987:
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Thanks for addressing comments in new patch. Patch looks good to me. +1
> Namenode changes to track multiple storages
> -------------------------------------------
>
> Key: HDFS-4987
> URL: https://issues.apache.org/jira/browse/HDFS-4987
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Suresh Srinivas
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: h4987_20130822.patch, h4987_20130827b.patch,
> h4987_20130827c.patch, h4987_20130827.patch, h4987_20130828.patch
>
>
> Currently namenode track in BlockInfo, the corresponding DataNodeDescriptor.
> I propose changing this with new abstraction StorageDescriptor. This change
> will also make DatanodeDescriptor a collection of StroageDescriptors. This
> will allow given a block, identify its storage and also Datanode.
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