The Outpost: The Last Room of the Systems-Talking Wing
The room about beating distance. A CDN opens a branch in every town so the answer is already next door, and it closes the systems-talking wing of Learning Maps.
#distributed-systems
9 posts
The Breaker and the Allowance: Two Short Films on How Systems Survive Traffic
Two short films on how a system takes a punch. The Breaker is how you stop one slow dependency from dragging the whole desk down. The Allowance is how you keep one greedy caller from eating the counter.
The Book Drop and the Greeter: Two Short Films on How Services Talk
Two short films that open the services-talking arc of Learning Maps. The Book Drop is how one part of a system hands work to another without waiting on it. The Greeter is how a crowd of requests gets spread across a fleet that can lose a machine and not miss a beat.
The Vote and the Ring: Two Short Films on How Machines Agree
Two short films that open the coordination story of Learning Maps. The Vote is how a cluster of unreliable machines agrees on one leader and one truth. The Ring is how the pieces survive machines coming and going all day.
The Data Wing: Six Short Films on How Distributed Data Behaves
Six short films on what happens to data the moment it stops fitting on one machine: the forced choice, the dial, taste, the cache, the branch library, the shard. The first wing of Learning Maps, the durable principle under each rented AWS label.
Just Enough Agreement: read your writes, and why not to over-buy consistency
Just Enough Agreement is Episode 3 of Learning Maps, a Napkin Films series that turns system design into story. Strong consistency is the expensive default, a cathedral when a sticky note would do. The skill is buying the cheapest guarantee the story actually needs: read your writes, monotonic reads, session consistency. Hand drawn on a napkin, narrated by two cloned voices, scored with a 14 Hz focus layer. CC BY 4.0.
The Dial: quorum, R plus W greater than N, and tuning consistency by counting
The Dial is Episode 2 of Learning Maps, a Napkin Films series that turns system design into story. Consistency is not on or off. It is a dial you set by counting: with N copies, when your reads plus your writes are greater than N, a read is forced to overlap a write and see the latest truth. Hand drawn on a napkin, narrated by two cloned voices, scored with a 14 Hz focus layer. CC BY 4.0.
AWS Is Smaller Than It Looks
AWS is taught as two hundred services. Underneath it is a handful of primitives, and every service is a frozen answer to a distributed-systems trade-off. The map I built studying for the SAA-C03, and the two questions that decode any new AWS service.
The Forced Choice: CAP, PACELC, and the trade every database already made
The Forced Choice is Episode 1 of Learning Maps, a new Napkin Films series that turns system design into story. A storm takes down the phone line between two librarians, and what happens next is the deepest fact in distributed systems: the CAP theorem, its twin PACELC, and the trade every database has already made. Hand drawn on a napkin, narrated by two cloned voices, scored with a 14 Hz focus layer. CC BY 4.0.