A Coding Guide to Understanding How Retries Trigger Failure Cascades in RPC and Event-Driven Architectures

This tutorial presents a comparative analysis of synchronous RPC-based systems and asynchronous event-driven architectures by simulating real-world load conditions, including variable latency, overload, and transient errors. It demonstrates how tight coupling in RPC systems can lead to failure cascades, especially under bursty traffic, by examining metrics such as tail latency, retries, and dead-letter queues, highlighting the resilience advantages of asynchronous designs. Key technical insights include the implementation of mechanisms like retries, exponential backoff, circuit breakers, bulkheads, and queues, which are essential for mitigating cascading failures in distributed systems. The tutorial emphasizes how asynchronous event-driven