Summary: Add namespace declarations in .proto files for other languages
Project: Hadoop Common
Issue Type: Improvement
Reporter: Binglin Chang
Currently .proto files use java_package to specify java packages in proto files, but namespace are not specified for other languages such as C++, this causes name collision in C++. we can add namespace declarations to avoid this.
In Java, the package specifier is used as the Java package, unless you explicitly provide a option java_package in your .proto file. So the original java package will not be affected.
About namespace name, how about "hadoop.common"(hadoop::common in C++) for all common sub-project proto files, and "hadoop.hdfs"(hadoop::hdfs in C++) for all hdfs sub-project proto files?
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