Chapter Assessment: Performance and Resilience

This review covers how the booking service stays fast and stays up under load: caching event reads, moving the confirmation email to another thread, virtual threads, connection pool sizing, the payment client, retries with concurrency limits, and timeouts. The bank holds 21 questions, and each attempt draws ten. Most items put you in front of a log line, an exception, or a configuration change and ask what it means or which fix is right. Several ask you to compute