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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8805) Move protocol buffer implementation of GetUserMappingProtocol from HDFS to Common
Date Wed, 19 Sep 2012 18:46:08 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13458951#comment-13458951
] 

Todd Lipcon commented on HADOOP-8805:
-------------------------------------

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

Did you test the specific getGroups command? Or just basic operations? I'm skeptical... :)

bq. Agree that the package change will break the clients, but do we want to support compatibility
already on the alpha releases or start promising wire-compat beginning with the first stable
release?

IMO we should already support wire compatibility, at least in HDFS. Despite the "alpha" labeling,
some people are running in production, and downstream projects like HBase are already building
against 2.0.x releases, so breaking now without a really good reason (eg a security issue)
seems imprudent.

                
> 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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