Why one cloud outage takes down half the Internet
Regional services: what an app spread over three zones still shares
An app copied into three availability zones should survive almost anything. On 20 October 2025, copies in three zones failed in the same minute. What were they all still sharing?
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Three copies in three zones, and all three failed together. To see what they shared, follow one scan. Rono points his scanner at Miva's phone, and the code of her ticket goes to one copy of your app, with a question: is this ticket paid?
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That copy cannot answer alone, because it keeps no tickets. If each copy kept the tickets it sold, the two others would never hear of them. The tickets have to sit in one place that all three copies can reach.
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