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https://issues.apache.org/jira/browse/HDFS-15022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16987276#comment-16987276
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Wei-Chiu Chuang commented on HDFS-15022:
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This looks like a new feature to me. Can we add documentation about this 
feature, how it is used and so on?

> Add new RPC to transfer data block with external shell script across Datanode
> -----------------------------------------------------------------------------
>
>                 Key: HDFS-15022
>                 URL: https://issues.apache.org/jira/browse/HDFS-15022
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Yang Yun
>            Assignee: Yang Yun
>            Priority: Minor
>         Attachments: HDFS-15022.patch, HDFS-15022.patch
>
>
> Replicating data block is expensive when some Datanodes are down, especially 
> for slow storage. Add a new RPC to replicate block with external shell script 
> across datanode. User can choose more effective way to copy block files.
> In our setup, Archive volume are configured to remote reliable storage. we 
> just add a new link file in new datanode to the remote file when do 
> replication.
>  



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