Github user rsltrifork commented on the pull request:
https://github.com/apache/storm/pull/700#issuecomment-146779690
Thanks for the quick reply, revans2.
> How do you know that the bolt is waiting in a controlled manner?
A Bolt sending to an external system can include a circuit breaker, so it
can keep waiting while the CB is tripped, while regularly retrying sends to
check if the recipient is up.
While doing this, the Bolt could also tell Storm that processing of the
current tuple is currently blocked, and that Storm should reset the tuple
timeout for it (and subsequent inflight tuples):
`collector.resetTupleTimeout(tuple);`
> Even if you do know that how do you know that if it is waiting in a
controlled manner that it has not lost track of a tuple?
The bolt is continuously saying that it still has the tuple.
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