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Add a simple additive increase, multiplicative decrease control loop for concurrency.
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This uses a feedback control to adjust the concurrency dynamically. This is for dynamic environments where capacity may change in response to load.
The algorithm is AIMD, with a hard coded a of 1, and b of 0.7, over 1 second windows.
A new method is added to signal backpressure,
Backoff, that consumers can use to signal backpressure. At this point, the total concurrency decreases.