Grokking the System Design Interview, Volume II
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Google Calendar: High-Level Design

Step 5: High-Level Design

We have the requirements, the load estimate, and the API. Now we draw the services that sit behind that API.

The calendar service is a globally distributed set of microservices. Several specialized services work together, and each one owns a narrow job. They run in data centers around the world, because the users are everywhere.

Architecture Overview

Every request travels the same path:

Clients -> Load Balancing -> Service Layer -> Data Stores

Clients reach the service through a load-balanced API gateway

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