Rejected - resetting CW to CWmin provides a periodic exit out of a very large CW. This mitigates at least somewhat the adverse effects of exponential backoff, wherein a successful transmitter keeps winning the medium successively at the expense of transmitters with a high CW. Sort of like a temporary capture effect. It is unwise for us to retry immediately when we get a failure as the upstream system may not have recovered from the fault which may overload the system. A well-known strategy called exponential backoff allows retries to be made initially quickly, but then at progressively longer intervals: for example, after 2, 4, 8, 15, then 30 seconds. This gives the upstream system a chance to recover and avoid overloading it.
The exponential backoff algorithm specifies that successive retransmission intervals should increase exponentially, based on the base retransmission interval. For example, if the base retransmission interval is 2 seconds, and the exponential backoff element is set, successive retransmission intervals if messages continue to go unacknowledged ... Imagine for example 10K requests to a web service failing due to a network issue and retrying at the same time after 15 seconds. The database server would get a sudden wave of 15K queries. By randomizing the delay, retries are spread across time and client. The delay for each retry is calculated by ExecutionStragegy.GetNextDelay.
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