Github user roshannaik commented on the issue:
https://github.com/apache/storm/pull/2270
I second the observation made by @HeartSaVioR about the hashmap lookups in
critical path. In my profiling & benchmarking, hashmap lookups have shown up as
bottlenecks. With ConcurrentHashmap it only gets worse. I think the perf
impact will be easiest to observe using ConstSpoutNullBoltTopo .... and
compared against LocalorShuffleGropuing ... with loadAwareness and ACKing
disabled in both cases.
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