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Update variable names Fill sliding window with 1 hr worth data Add comment Update experiemnt resource to be deterministic Change deterministic default value to false Cleanup Remove unused variable Make initial seed error rate more customizable Add seed_error_rate as a property
* Prefilling added * Change initial duration to 900 s
* testing different circuit breaking scenarios * adding concurrency * adds more puts to get further information during phases * Fixing concurrency, unprotected ping, extras * update classic sustained test * cleaning up outdated tests, and testing without ping rate * modify ki instead of dividing by window size --------- Co-authored-by: Abdulrahman Alhamali <abdulrahman.alhamali@shopify.com>
Remove Throughput and Duration Graphs
Test Near target error rate
* switch algorithm to a sliding window instead of discrete * clean up AI slop PR * provide observations per minute to the smoother from the pid controller * fix tests * remove unused smoother in setup * fix alpha value * fix tests and run experiments * fix max size for sliding window and rerun experiments
Remove unnecessary comments and fix smoother initalization
* add elastic defensiveness * remove kd * update docs and run experiments * fix tests --------- Co-authored-by: Fernando Aguasvivas <fernando.aguasvivas@shopify.com>
…d classic modes (#808) * use lambda to implement dual circuit breaker * fix tests * class method to allow setting a global selector for adaptive config * remove unneeded methods that are no longer used use CircuitBreakerBehaviour * allow adaptive_circuit_breaker_selector to be unset * make dynamic configuration call only on acquire * require resource to be provided * fix: avoid an extra lookup to use_adaptive in metrics * various fixes * nit: cleanup * fix logging to both circuit breakers at the same time * use logic from both acquire methods in dual_circuit_breaker * fix last error tracking test by using properly scoped exceptions variable * fix demos * remove unused attr_reader for name use symbols for active_breaker_type instead of strings create separate acquire methods for readability use active_breaker_type consistently to determine breaker type remove useless AI-generated tests fix useful tests * nit: typo fix * nit: remove TODO comment * don't return if variables are nil (dangerous) use_adaptive proc no longer exists at initialization (proc is set at runtime) * address PR comments * make active_circuit_breaker readable for tests clean up unneeded tests and AI fluff * improve track both breakers test with assert_equal * replace "legacy" with "classic", notify on change in cb type * replace legacy with classic * notify on change in cb type, remove verbose comments, and refactor `handle_adaptive_acquire` * metrics functions for dcb example * have error handling parity between classic and adaptive * fix exceptions parameter passing * reference as instance variable * use acquire directly from circuit breakers * fix dcb test and remove verbose content * fix double counting of errors * undo the move of method to public * make active_breaker_type public * rerun experiments --------- Co-authored-by: Kristofer Gaudel <kris.gaudel@shopify.com> Co-authored-by: Abdulrahman Alhamali <abdulrahman.alhamali@shopify.com>
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kris-gaudel
commented
Dec 17, 2025
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| # Configure Semian with dual circuit breaker | ||
| Semian::NetHTTP.semian_configuration = proc do |host, port| | ||
| Semian::NetHTTP.semian_configuration = proc do |host, _port| |
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Building off of the architecture discussed here and former work here
This PR implements a proof-of-concept for how a centralized PID state service can be shared among adaptive circuit breakers in a pod. The idea is that a centralized PID state service aggregates observations from all workers and broadcasts rejection rate updates, ensuring all workers have a consistent, pod-wide view of service health.
Notable features:
MessagePackformatasync-busReferences: