Status Updates From Designing Distributed Syste...

“Replicated services are primarily used for stateless services while shards are used for stateful service.

Sharding is not exclusive to stateful services though. They can also be used to isolate poisoned requests”

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Idempotency is the notion that whether an action is performed a single times or many times, the result is identical.

Example: x=5(idempotent) vs. x=x+1 (not idempotent)

If we know that an operation is idempotent, in the face of failures, we can simply repeat it until it succeeds.

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