PYTHON-5629 Increase max overload retries from 3 to 5 and initial delay from 50ms to 100ms#2599
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…tion rate limiter triggers (#2509) Co-authored-by: Iris <58442094+sleepyStick@users.noreply.github.com> Co-authored-by: Noah Stapp <noah.stapp@mongodb.com> Co-authored-by: Shane Harvey <shnhrv@gmail.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> PYTHON-5629 Increase max overload retries from 3 to 5 and initial delay from 50ms to 100ms (#2599) PYTHON-5517 Simplify pool backpressure behavior (#2611) synchro update network_layer update pool shared update pool shared update run-tests
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One of the goals of new client backpressure overload retry behavior is to withstand temporary load spikes on the server. The operation burst workload (PERF-7190) shows that 3 retries is insufficient at reducing the error rate during brief overload periods. This can be attributed to the short effective retry time window of 3 retries and initial delay 100ms which is only 100ms + 200ms + 400ms = 700ms. With 5 retries the time window increases to 100ms + 200ms + 400ms + 800ms + 1600ms = 3100ms.
Without any retries the workload encounters ~8000 overload errors. With 3 max retries the workload encounters ~500 errors. With 5 max retries the workload encounters ~5 errors.
The design has been updated to propose increasing the retry limit to 5 and initial delay from 50ms to 100ms.