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From "Bo Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8805) Move protocol buffer implementation of GetUserMappingProtocol from HDFS to Common
Date Tue, 18 Sep 2012 05:46:08 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457618#comment-13457618
] 

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

I realized a problem that YARN RPC requires protocol implementation follows the following
naming convention: PROTOCOL + PBServiceImpl. This naming convention is hard coded in org.apache.hadoop.yarn.factories.impl.pb.RpcServerFactoryPBImpl#getPbServiceImplClassName.
Thus, to make GetUserMappingProtocol usable in both HDFS & YARN, we have to follow the
convention of YARN rather than HDFS..

In YARN, the protocbuf generated class shares the same name as the protocol itself (e.g. RMAdminProtocol).
Thus, the current patch follows YARN convention.

I have tested the patch from command line as follows.
(1) start a namenode
(2) bin/hdfs groups <username>

It returns the correct results.

                
> 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
>         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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