Grokking the System Design Interview, Volume II
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Notification System: Failure Modes and Operations

Step 9: Failure Modes and Operations

Step 8 made the design big enough for the load. This step asks what it does when a part of it stops working.

Everything this system depends on to deliver is outside it. Apple, Google, an email provider, and an SMS gateway all sit on the delivery path. None of them is under our control.

So the failures worth designing for are mostly other people's. We cannot stop them. We can only decide what our system does while they last.

A provider is down or throttling

An SMS gateway starts returning 503, or a push service begins rate limiting

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