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Versioning in an Event Sourced System

Gregory Young

Have you had troubles with versioning an Event Sourced system? Just getting into a new Event Sourced system for the first time? This book is the definitive guide of how to handle versioning over long periods of time.

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About the Book

I got many questions about versioning so instead of answering them over and over I decided to write a longer answer.

This got to be quite a few pages so I packaged it up and published it as a short book.

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Author

About the Author

Gregory Young

Contents

Table of Contents

Status

  1. Goals
  2. Feedback
  3. Status

Why Version?

Why can’t I update an event?

  1. Immutability
  2. Consumers
  3. Audit
  4. Worms
  5. Crime

Basic Type Based Versioning

  1. Getting Started
  2. Define a Version of an Event
  3. Double Write
  4. But…

Weak Schema

  1. Mapping
  2. Wrapper
  3. Overall Considerations

Negotiation

  1. Atom
  2. Move Negotiation Forward
  3. How to Translate
  4. Use with Structural Data

General Versioning Concerns

  1. Versioning of Behaviour
  2. Changing Semantic Meaning
  3. Snapshots
  4. Avoid ‘And’

Whoops, I Did It Again

  1. Accountants Use Pens
  2. Types of Compensating Actions
  3. How Do I Find What Needs Fixing?
  4. More Complex Example
  5. But I Really Screwed Up

Copy and Replace

  1. Simple Copy-Replace
  2. Simple>
  3. With a System Live
  4. Stream Boundaries are Wrong
  5. Changing Stream Boundaries on a Running System

Cheating

  1. Two Aggregates, One Stream
  2. One Aggregate, Two Streams
  3. Copy-Transform
  4. Versioning Bankrupty

Internal vs External Models

  1. External Integrations
  2. Granularity
  3. Rate of Change
  4. How to Implement
  5. Summary

Versioning Process Managers

  1. Procees Managers
  2. Basic Versioning
  3. Upcasting State
  4. Take Over
  5. Warning

Causes

Causes Supported

Code Club

Code Club

https://www.codeclub.org.uk
A nationwide network of volunteer-led after school coding clubs for children aged 9-11.
We create projects for our volunteers to teach at after school coding clubs or at non-school venues such as libraries. The projects we make teach children how to program by showing them how to make computer games, animations and websites. Our volunteers go to their local club for an hour a week and teach one project a week. Each term the students will progress and learn more whilst at the same time using their imaginations and making creative projects. Terms 1 & 2 use Scratch to teach the basics of programming. Term 3 teaches the basics of web development using HTML and CSS. Term 4 teaches Python and so on. We’d like to put a Code Club in every single primary school in the country. There are over 21,000 primary schools in the UK, it’s a big task but we think we can do it!

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