Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/1241#issuecomment-48569956
Actually it's still necessary once the PR gets merged. It basically
compares all the public interfaces at bytecode level against 1.0, and see if
any public interfaces changed. This is done in place to ensure API
compatibility throughout the 1.x release cycle.
Unfortunately, all the methods that are labeled "private[package_name]"
loses the private visibility at bytecode level, so the compatibility checker is
more conservative and we would need to manually mark these interface changes.
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