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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4909) Protocol buffer support compiles under C, but fails to link due to duplicate symbols
Date Wed, 16 Apr 2014 20:36:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13971920#comment-13971920

Hadoop QA commented on HDFS-4909:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-hdfs-project/hadoop-hdfs.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/6678//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/6678//console

This message is automatically generated.

> Protocol buffer support compiles under C, but fails to link due to duplicate symbols
> ------------------------------------------------------------------------------------
>                 Key: HDFS-4909
>                 URL: https://issues.apache.org/jira/browse/HDFS-4909
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode, journal-node, namenode
>    Affects Versions: 3.0.0, 2.1.0-beta
>            Reporter: Ralph Castain
>            Assignee: Colin Patrick McCabe
>            Priority: Blocker
>         Attachments: HDFS-4909.001.patch, HDFS-4909.002.patch, pcreate.pl
> The revised protocol buffer support seems to be compiling for me when using the protobuf-c
cross-compiler. However, I still cannot construct a library of the results. This may be a
Hadoop issue, or could be an issue with the protobuf-c cross-compiler. What I see are a bunch
of these when attempting to link the resulting .o files:
> /home/common/hadoop/hadoop-common/foo/obj/DatanodeProtocol.pb-c.o: In function `hadoop_hdfsreport_bad_blocks_request_proto_init':
> DatanodeProtocol.pb-c.c.text+0x2bb4): multiple definition of `hadoop_hdfsreport_bad_blocks_request_proto_init'
> /home/common/hadoop/hadoop-common/foo/obj/ClientNamenodeProtocol.pb-c.o:ClientNamenodeProtocol.pb-c.c.text+0x277d):
first defined here
> From what I can see, this is caused by the
> package hadoop.hdfs;
> line in the .proto files, when combined with the later
> import "hdfs.proto";
> This appears to bring a complete copy of the hdfs.proto file into the source code, which
then recompiles it - leading to the duplicate symbols.
> I have attached an updated pcreate.pl script that illustrates the problem. Excluding
the following .proto files allows all to be successfully built and linked:
> DatanodeProtocol
> ClientNamenodeProtocol
> QJournalProtocol
> Ralph

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