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https://issues.apache.org/jira/browse/HDFS-15022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16990703#comment-16990703
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Yang Yun commented on HDFS-15022:
---------------------------------
Thanks [Wei-Chiu
Chuang|https://issues.apache.org/jira/secure/ViewProfile.jspa?name=weichiu] for
your comment. I added a documentation to introduce the user case.
> 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,
> link_block_across_datanode.pdf
>
>
> 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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