Sharding vs partitioning
Two words used interchangeably in meetings, and the operational difference that makes them not the same thing at all.
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Indexes I added, then removed
Three index changes that looked obvious in review and cost more than they saved once real traffic arrived.
Designing a notification system
Fan-out, user preferences and the retry budget — sketched end to end before building any of it.
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Have a system worth arguing about?
If this note raised a question, or you would have designed it differently, I would like to hear it.
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