DEVELOPMENT OF CASCADING CIRCUIT BREAKER SYSTEM USING EVENT-DRIVEN APPROACH IN MICROSERVICES

• Main Author: Daffa Argakoesoemah, Mohamad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/85066
• Institution: Institut Teknologi Bandung

Resilience, particularly in handling service failures, is a significant challenge in microservices. This can be addressed using circuit breakers to limit calls to failed services. However, changes in the state of circuit breakers are only known by directly connected services, allowing subsequent services in the chain to continue making calls. One study addresses this issue by creating a cascading circuit breaker system to prevent premature calls to failed services. Nevertheless, this system has limitations, such as the inability to inform newly deployed services and services that are independent of the service aware of the state change. Moreover, there are research opportunities to improve how circuit breakers operate. To address those existing problems, this final project develops an event-driven cascading circuit breaker system. This approach is chosen because an event-driven communication style offers better flexibility compared to the request-response style used in the existing cascading circuit breaker system. Additionally, improvements are made by providing a mechanism to reroute calls to alternative endpoints when an endpoint is in an open state. The cascading circuit breaker system is deployed as a sidecar to offer enhanced flexibility. The system was successfully implemented and orchestrated using Kubernetes. The information regarding the open state change was successfully broadcasted to both new services and services that are independent of the service aware of the state change. Moreover, the system successfully rerouted calls to alternative endpoints when an endpoint was in an open state. The system's average overhead is relatively low, at 2.86 ms. On the other hand, the time required to propagate the state change was measured at 2.12 minutes.