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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4866) Protocol buffer support cannot compile under C
Date Sat, 15 Jun 2013 04:23:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Nauroth updated HDFS-4866:
--------------------------------

    Release Note: The Protocol Buffers definition of the inter-namenode protocol required
a change for compatibility with compiled C clients.  This is a backwards-incompatible change.
 A namenode prior to this change will not be able to communicate with a namenode after this
change.
    Hadoop Flags: Incompatible change,Reviewed
    
> Protocol buffer support cannot compile under C
> ----------------------------------------------
>
>                 Key: HDFS-4866
>                 URL: https://issues.apache.org/jira/browse/HDFS-4866
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 3.0.0, 2.1.0-beta
>            Reporter: Ralph Castain
>            Assignee: Arpit Agarwal
>            Priority: Blocker
>         Attachments: HDFS-4866.002.patch, HDFS-4866.branch-2.001.patch, HDFS-4866.trunk.001.patch,
NamenodeProtocol.pb-c.c, NamenodeProtocol.pb-c.h, pcreate.pl
>
>
> When compiling Hadoop's .proto descriptions for use in C, an error occurs because one
of the RPC's in NamenodeProtocol.proto is named "register". This name is a reserved word in
languages such as C. When using the Java and C++ languages, the name is hidden inside a class
and therefore doesn't cause an error. Unfortunately, that is not the case in non-class languages
such as C.
> Note: generating the C translation of the .proto files requires installation of the protobuf-c
package from google:
> http://code.google.com/p/protobuf-c/

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