Comment #3 on issue 493 by owen.oma...@gmail.com: protobuf-java (2.5.0) GeneratedMessage#getUnknownFields() not implemented
http://code.google.com/p/protobuf/issues/detail?id=493

This is *really* unfortunate, given that 2.5 generated code won't compile against 2.4 libraries. It means that the entire Hadoop ecosystem needs to move protobuf versions synchronized with each other. Can I suggest that if you are going to break compatibility, that you make it fail at compile time rather than run time so that the error will be caught during compilation?

Much much better of course is to not break compatibility. Using reflection to determine the version of the protobuf library and use new features if they are available would be the preferred solution.

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