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