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https://issues.apache.org/jira/browse/HDFS-928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12805505#action_12805505
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Zlatin Balevsky commented on HDFS-928:
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@Konstantin: This will make possible using a mock object that implements the
DatanodeProtocol interface which in turn will make writing unit tests much
faster and simpler.
@Eli: I'm not saying there is any specific problem with the current way; I'm
interested in having the flexibility to swap in any implementation, including
such that do not use any kind of RPC.
> Ability to provide custom DatanodeProtocol implementation
> ---------------------------------------------------------
>
> Key: HDFS-928
> URL: https://issues.apache.org/jira/browse/HDFS-928
> Project: Hadoop HDFS
> Issue Type: Wish
> Components: data-node
> Reporter: Zlatin Balevsky
> Priority: Trivial
>
> This should make testing easier as well as allow users to provide their own
> RPC/namenode implementations. It's pretty straightforward:
> 1. add
> interface DatanodeProtocolProvider {
> DatanodeProtocol getNameNode(Configuration conf);
> }
> 2. add a config setting like "dfs.datanode.protocol.impl"
> 3. create a default implementation and copy/paste the RPC initialization code
> there
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