How Discord Stores Billions of Messages
Early story of Discord outgrowing MongoDB and moving messages to Cassandra with a channel+time-bucket partition key.
- Published
- 2017-01-13
- Scale
- billions of messages, 120 million messages/day
- Techniques
- database migration data modeling partitioning
- Stack
- Cassandra MongoDB
Try this stack yourself
- Railway · Deploy something like this on Railway: spin up MongoDB plus your app in a few clicks. New accounts get $20 in credit (applied when you pick a paid plan).
Railway isn't part of Discord's setup in this story. It's just an easy place to try the same building blocks.
Some links above are affiliate links: if you sign up, How They Scaled may earn a commission at no extra cost to you. We only list tools that fit the stack in the story.