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https://issues.apache.org/jira/browse/HDFS-400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved HDFS-400.
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Resolution: Fixed
> Make the Data transfer streaming protocol concrete
> --------------------------------------------------
>
> Key: HDFS-400
> URL: https://issues.apache.org/jira/browse/HDFS-400
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Sanjay Radia
>
> The Data transfer between client and datanode and between datanode and
> datanode is a streaming
> protocol where messages and data is sent across a tcp connection.
> The messages are not concrete data types (ie they are not classes or
> interfaces), instead the fields are marshalled and unmarshalled in in various
> classes.
> The message exchange could be made concrete by declaring message data types
> and/or interfaces.
> This will help future automated versioning via protocol-buffers style
> approach. It will also help document the interface and can simplify the code.
>
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