Github user hustfxj commented on the pull request:
https://github.com/apache/storm/pull/1250#issuecomment-200402469
@revans2 ThreadLocalRandom is 20% faster than XORShiftRandom. But
ThreadLocalRandom is static. Yes, we can't use XORShiftRandom in
executor.clj due to thread safety now. But if we assure every spout/bolt thread
has itself XORShiftRandom object. Thus we can.
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