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From "Jitendra Nath Pandey (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-7227) Remove protocol version check at proxy creation in Hadoop RPC.
Date Mon, 02 May 2011 22:45:03 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7227?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jitendra Nath Pandey updated HADOOP-7227:
-----------------------------------------

    Release Note: 
1. Protocol version check is removed from proxy creation, instead version check is performed
at server in every rpc call.
2. This change is backward incompatible because format of the rpc messages is changed to include
client version, client method hash and rpc version.
3. rpc version is introduced which should change when the format of rpc messages is changed.

> 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: Improvement
>          Components: ipc
>            Reporter: Jitendra Nath Pandey
>            Assignee: Jitendra Nath Pandey
>             Fix For: 0.23.0
>
>         Attachments: HADOOP-7227.2.patch, HADOOP-7227.3.patch, HADOOP-7227.4.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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