Grokking the System Design Interview, Volume II
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Design Reddit: Detailed Component Design

Step 6: Detailed Component Design and Data Management

This step covers how each major part works inside, and how its data is organized. That means the schemas, the partitioning, and how each feature is built.

Key Points

Data model. Posts are records in a sharded NoSQL store, partitioned by a hash of post_id or by subreddit. Comments are adjacency-list items sharded by post_id, so one whole thread lives in one place. Subreddits, users, and their many-to-many subscriptions live in relational tables.

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