Grokking the System Design Interview, Volume II
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Google Calendar: Scalability and Performance

Step 8: Scalability and Performance Considerations

Designing for 100M+ users globally requires careful strategies in data distribution, caching, and fault tolerance. Below are the key strategies we employ to ensure the system scales and performs well:

  • Sharding and Data Partitioning: We will partition the database to handle the load. A common strategy is to shard data by user_id or calendar_id. For example, all events (and related invites) for users in a certain ID range or with a hash of user_id go to a particular database shard

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