Write long-running, fault-tolerant business logic as ordinary code that survives failures and resumes where it left off — with Cadence.

Welcome to Cadence: Durable Workflow Orchestration.

A practical, in-depth guide to Cadence, the fault-tolerant workflow orchestration engine (from Uber) that pioneered durable execution. Learn how Cadence makes reliable long-running processes easy: the durable execution problem, the server and worker architecture, workflows and activities, event history and determinism (replay), timers, signals and queries, reliability (retries, timeouts, heartbeats, sagas), versioning and replay testing, and operating Cadence at scale.

This title is part of the ShriIra library and is free to read in full, right here — our small contribution to making world-class knowledge easy to reach.

A note on reading it: open the Contents menu at the top of the reader to jump between chapters, use the Aa menu to set a comfortable text size, theme (light, sepia, or night), and single- or two-page layout. Your place is saved automatically, so you can always pick up where you left off.

We hope it serves you well.

— Shriira Press

Contents

1. Chapter 1 — What Cadence Is
2. Chapter 2 — The Durable Execution Problem
3. Chapter 3 — Architecture
4. Chapter 4 — Workflows and Activities
5. Chapter 5 — Event History and Determinism
6. Chapter 6 — Timers, Signals, and Queries
7. Chapter 7 — Reliability — Retries, Timeouts, and Failures
8. Chapter 8 — Versioning and Testing
9. Chapter 9 — Operations and Observability
10. Chapter 10 — Cadence in Practice