Description
The per-partition circuit breaker (PPCB) should track 403:3 (WriteForbidden) errors. Currently, PPCB records failures generically without considering 403 status code with sub-status 3, which indicates a write-region failover scenario in single-writer accounts.
Context
403:3 (SubStatusCodes.WRITE_FORBIDDEN) signals that writes are forbidden on the current region, typically during a write-region failover.- The existing endpoint discovery retry policy already handles
403:3 for region failover (_endpoint_discovery_retry_policy.py L100), but PPCB does not currently factor this error into its partition health tracking.
- Incorporating
403:3 into PPCB would allow the circuit breaker to more accurately reflect partition health during region transitions and avoid routing requests to regions that are returning write-forbidden errors.
Expected Behavior
PPCB should recognize 403:3 as a trackable failure so that partition health state is updated accordingly when a region begins returning WriteForbidden errors. This would allow PPCB to proactively route requests away from affected regions/partitions during failover scenarios.
Description
The per-partition circuit breaker (PPCB) should track
403:3(WriteForbidden) errors. Currently, PPCB records failures generically without considering403status code with sub-status3, which indicates a write-region failover scenario in single-writer accounts.Context
403:3(SubStatusCodes.WRITE_FORBIDDEN) signals that writes are forbidden on the current region, typically during a write-region failover.403:3for region failover (_endpoint_discovery_retry_policy.pyL100), but PPCB does not currently factor this error into its partition health tracking.403:3into PPCB would allow the circuit breaker to more accurately reflect partition health during region transitions and avoid routing requests to regions that are returning write-forbidden errors.Expected Behavior
PPCB should recognize
403:3as a trackable failure so that partition health state is updated accordingly when a region begins returningWriteForbiddenerrors. This would allow PPCB to proactively route requests away from affected regions/partitions during failover scenarios.