Github user revans2 commented on the pull request:
https://github.com/apache/storm/pull/700#issuecomment-135422890
@arunmahadevan It is the intention to throttle the entire topology, all
spouts. This is what Heron does and is intended to be a last resort, which is
better then nothing, but not a truly final solution. The reason for this is
that from the level of a single queue it is very difficult to know what is
causing that congestion. STORM-907 is intended as a follow on that will analyze
the topology, determine where there are loops and provide more of true
backpressure. But in the case of a loop, and storm does support loops, you
have no way to determine which upstream part is causing slowness. And in fact
it could be the bolt itself, and it needs to increase it's parallelism.
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