System Design Interview Crash Course
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Design a Distributed Lock Manager (like Chubby)

Here is a detailed, step-by-step design for a Distributed Lock Manager (DLM) similar to Google’s Chubby.

1. Problem Definition and Scope

We are designing a distributed lock service and coordination system. It serves as the "root of trust" for a distributed architecture, allowing thousands of other systems (like databases, load balancers, and job schedulers) to elect leaders and store small, critical configuration files.

  • User Groups: Internal software services and infrastructure systems (not human end-users).

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