Github user revans2 commented on the issue:
https://github.com/apache/storm/pull/2241
I have another chart now showing a comparison between master and this
branch, just varying the number of splitter bolts in the topology. There are 2
ackers, 4 spouts, and 4 count bolts all within a single worker and with a max
spout pending set to 500. All of the configs are the defaults, and it is on my
laptop like before.
The scary thing here is that with these changes there is a tiny window
where you get "good" throughput (lets say above 150k sentences per second) for
this branch. The previous branch has a very very wide window. The thing that
concerns me the most with the way it is now, is that there will be a lot of
people who didn't turn the parallelism as low as possible, because it just
works, and they will all have their topologies go from 180k/sec down to
50k/sec. And tuning them all perfectly to balance on that exact parallelism
for the given heterogeneous hardware that we run on is going to be impossible.
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