Github user abhishekagarwal87 commented on the pull request:
https://github.com/apache/storm/pull/1223#issuecomment-197279568
This is not to be merged yet. Right now, I only wanted to showcase all the
changes that are to be made for the upgrade. Kryo 3 apparently has some
performance improvements. Since the kryo serialization is used only for intra
topology transfer, there should be no compatibility issues. Let me know if this
change has other side effects.
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