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Jitendra Nath Pandey commented on HADOOP-8044:
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ProtocolMetaInterface is supposed to be used to obtain information about
underlying protocol e.g. to check if a method is supported on the server side.
Its implementation creates ProtocolMetaInfoPB connection to server and gets
protocol signatures. For (contrived)example, in future if we want to add a
method to find how many versions of the given protocol are supported at the
server, we could add a method in this interface.
I think ProtocolTranslator was added as a mechanism to expose the proxy so as
to reach the connectionId.
They have two very different purposes.
> Unify ProtocolMetaInterface and ProtocolTranslator interface
> ------------------------------------------------------------
>
> Key: HADOOP-8044
> URL: https://issues.apache.org/jira/browse/HADOOP-8044
> Project: Hadoop Common
> Issue Type: Improvement
> Components: ha, ipc
> Affects Versions: HA Branch (HDFS-1623)
> Reporter: Todd Lipcon
> Assignee: Aaron T. Myers
> Priority: Minor
> Fix For: HA Branch (HDFS-1623)
>
>
> In the HA branch we have a "ProtocolTranslator" interface which we had to
> add, and it seems to have the same purpose as the "ProtocolMetaInterface"
> interface which got added in trunk in the meantime. We should unify the two.
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