Grokking Spring Boot
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Design Review: Scaling the Service

One instance of the finished booking service works within five limits, each set in an earlier lesson or left at its default:

  • 200 request threads, Tomcat's default, from The Embedded Server.
  • 10 database connections, with a connection timeout of 2 seconds.
  • 10 payment calls at a time, from booking.payments.concurrency-limit.
  • 1 outbox relay, which runs every 500 ms.
  • 1 Kafka consumer in the group notifications.

A busy concert night needs more than one instance

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