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https://issues.apache.org/jira/browse/HDFS-4989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13773982#comment-13773982
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Junping Du commented on HDFS-4989:
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This jira need to add an API of getDatanodeStorageReport(StorageType) in 
clientprotocol for balancer to get each DN's storage info (capacity, dfsUsed, 
etc.). As a return of this API, shall we use DatanodeStorageInfo[] so that we 
move it from o.a.h.hdfs.server.blockmanagement to o.a.h.hdfs.protocol or we can 
create something simpler to have only necessary info (without blockList, etc.). 
I prefer the latter one, what do you think?
                
> Balancer needs to consider storage type in balancing
> ----------------------------------------------------
>
>                 Key: HDFS-4989
>                 URL: https://issues.apache.org/jira/browse/HDFS-4989
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: balancer, datanode, namenode
>            Reporter: Suresh Srinivas
>            Assignee: Junping Du
>
> Balancer needs to balance with in a storage tier. Also needs an option to 
> balance only a specific storage type.

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