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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1335) HDFS side of HADOOP-6904: first step towards inter-version communications between dfs client and NameNode
Date Wed, 09 Feb 2011 17:08:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12992582#comment-12992582
] 

Hudson commented on HDFS-1335:
------------------------------

Integrated in Hadoop-Hdfs-trunk-Commit #539 (See [https://hudson.apache.org/hudson/job/Hadoop-Hdfs-trunk-Commit/539/])
    

> HDFS side of HADOOP-6904: first step towards inter-version communications between dfs
client and NameNode
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1335
>                 URL: https://issues.apache.org/jira/browse/HDFS-1335
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client, name-node
>    Affects Versions: 0.22.0
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.23.0
>
>         Attachments: hdfsRPC.patch, hdfsRpcVersion.patch
>
>
> The idea is that for getProtocolVersion, NameNode checks if the client and server versions
are compatible if the server version is greater than the client version. If no, throws a VersionIncompatible
exception; otherwise, returns the server version.
> On the dfs client side, when creating a NameNode proxy, catches the VersionMismatch exception
and then checks if the client version and the server version are compatible if the client
version is greater than the server version. If not compatible, throws exception VersionIncomptible;
otherwise, records the server version and continues.

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