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Date: Thu, 20 Sep 2012 05:36:09 +1100 (NCT)
From: "Bo Wang (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <1223979708.98507.1348079769826.JavaMail.jiratomcat@arcas>
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Subject: [jira] [Commented] (HADOOP-8805) Move protocol buffer
 implementation of GetUserMappingProtocol from HDFS to Common
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    [ https://issues.apache.org/jira/browse/HADOOP-8805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13458939#comment-13458939 ] 

Bo Wang commented on HADOOP-8805:
---------------------------------

Hi Todd,

Thanks for looking at this. I just tested the wire compatibility using two versions to talk to each other. 

An old client (w/o patch) can talk to a new namenode (w/ patch). 
A new client (w/ patch) can talk to an old namenode (w/o patch).

                
> Move protocol buffer implementation of GetUserMappingProtocol from HDFS to Common
> ---------------------------------------------------------------------------------
>
>                 Key: HADOOP-8805
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8805
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Bo Wang
>            Assignee: Bo Wang
>             Fix For: 2.0.3-alpha
>
>         Attachments: HADOOP-8805.patch, HADOOP-8805-v2.patch, HADOOP-8805-v3.patch
>
>
> org.apache.hadoop.tools.GetUserMappingProtocol is used in both HDFS and YARN. We should move the protocol buffer implementation from HDFS to Common so that it can also be used by YARN.

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