Github user roshannaik commented on the issue:
    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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