Github user avati commented on the pull request:
https://github.com/apache/spark/pull/1813#issuecomment-51549053
shade plug-in works in many cases but not in all. From what I understand,
if the dependency is direct, shade plugin works fine. In case of protobuf it
was indirect dependency - akka-2.3 specifically needs protobuf 2.5 and hadoop1
specifically needs protobuf 2.4. So a custom rebuilt package of either one was
inevitable.
I haven't looked deep into the guava situation, just provided some context.
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