Fan-Out on Rik Kisnah - Bloghttps://www.rik-kisnah.ai/tags/fan-out/Recent content in Fan-Out on Rik Kisnah - BlogHugoenTue, 13 Nov 2018 09:00:00 -0800Design a Notification Systemhttps://www.rik-kisnah.ai/teach/systems/design-a-notification-system/Tue, 13 Nov 2018 09:00:00 -0800https://www.rik-kisnah.ai/teach/systems/design-a-notification-system/One event, a million phones. Send the right message on the right channel to the right person, once, and let them turn it off. Fan-out, retries, and the setting everyone forgets: preferences.