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https://issues.apache.org/jira/browse/HADOOP-7227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13026637#comment-13026637
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Jitendra Nath Pandey commented on HADOOP-7227:
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This patch does not change the semantics of protocol versions. It only moves
the version check from client at proxy creation to rpc call at server, and thus
saving a round-trip of messages.
HADOOP-6904 introduced isMethodSupported in ProtocolProxy, which needs server
methods. That logic is also maintained except that the server methods are
fetched when isMethodSupported is called for the first time.
> Remove protocol version check at proxy creation in Hadoop RPC.
> --------------------------------------------------------------
>
> Key: HADOOP-7227
> URL: https://issues.apache.org/jira/browse/HADOOP-7227
> Project: Hadoop Common
> Issue Type: New Feature
> Reporter: Jitendra Nath Pandey
> Assignee: Jitendra Nath Pandey
> Attachments: HADOOP-7227.2.patch
>
>
> Currently when a proxy is created for a protocol, there is a round trip of
> messages to check the protocol version. The protocol version is not checked
> in any subsequent rpc which could be a problem if the server restarts with a
> new protocol version. This issue and also the additional round-trip at proxy
> creation can be avoided if we add the protocol version in every rpc, and
> server checks the protocol version for every call.
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