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https://issues.apache.org/jira/browse/HADOOP-4006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12632856#action_12632856
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Konstantin Shvachko commented on HADOOP-4006:
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- I like {{DataTransferProtocol}}. I was thinking about creating such a class
and placing common data transfer methods in it. Say, serialization of block
locations, opening sockets, verifying replies can belong to this protocol.
Right now we duplicate code in different places rather than reusing it.
More, this protocol is used not only for client-to-data-node communication but
also between data-nodes themselves.
- Although it is not an ipc protocol it is still versioned, so I'm +1 to derive
DataTransferProtocol from VersionedProtocol.
> Cleanup HDFS FSConstants
> ------------------------
>
> Key: HADOOP-4006
> URL: https://issues.apache.org/jira/browse/HADOOP-4006
> Project: Hadoop Core
> Issue Type: Sub-task
> Components: dfs
> Reporter: Sanjay Radia
> Fix For: 0.19.0
>
> Attachments: refactorConstants2.patch, refactorConstants3.patch,
> refactorConstants4.patch
>
>
> * Remove RPC Codes - they are unused
> * Move the data node streaming constants into its own interfaces/class
> * Remove the extends FSConstants
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