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Grokking Modern System Design Interview

Introduction to Pub-Sub

Learn the essential use cases for implementing pub-sub systems in large-scale distributed applications. Define the strict functional and non-functional requirements, with a focus on durability and availability. Design the foundational API structure needed before building the complete System Design.

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Publish–subscribe messaging enables asynchronous communication between producers and consumers. This decoupling improves scalability, fault isolation, and independent service evolution.

Use cases of pub-sub

Common use cases include:

  • Improved performance: Push-based distribution eliminates the need for recipients to poll for updates. This reduces latency and improves response times.

  • Handling ingestion: Pub-sub efficiently handles log ingestionLog ingestion refers to importing logs into a database for immediate use, such as monitoring. Huge applications like Facebook produce massive amounts of data and logs. Real-time fetching and processing of logs allow us to run analysis and take quick actions in case of failures.. It buffers large data streams (such as user interactions) before delivering them to analytical systems. Services like Meta’s Scribe use this pattern to route logs to specific consumers or archive them, effectively managing enormous data volumes.

  • Real-time monitoring: Raw or processed ...