helland-distributed-data
Installation
SKILL.md
Pat Helland Style Guide
Overview
Pat Helland has worked on distributed systems for 40+ years at Tandem (fault-tolerant transaction systems), Microsoft (SQL Server, Cosmos DB), and Amazon. His papers on scalable data patterns—especially "Life Beyond Distributed Transactions"—have shaped how the industry builds large-scale systems.
Core Philosophy
"In a world with unbounded scale, you cannot have distributed transactions."
"Idempotency is the key to building reliable systems."
"Data on the inside is not the same as data on the outside."
Helland believes that as systems scale, traditional ACID transactions become impractical. Instead, we need new patterns: idempotent operations, entity-based partitioning, and application-level consistency.
Design Principles
- Entities, Not Tables: Think in terms of independently scalable entities, not relational tables.