Building an Event-Driven Data Mesh

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• Preface
  • Conventions Used in This Book
  • OReilly Online Learning
  • How to Contact Us
  • Acknowledgments
• 1. Event-Driven Data Communication
  • What Is Data Mesh?
  • An Event-Driven Data Mesh
  • Using Data in the Operational Plane
    • The Data Monolith
    • The Difficulties of Communicating Data for Operational Concerns
      • Strategy 1: Replicate data between services
      • Strategy 2: Use APIs to avoid data replication needs
    • The Analytical Plane: Data Warehouses and Data Lakes
    • The Organizational Impact of Schema on Read
      • Problem 1: Violated data model boundaries
      • Problem 2: Lack of single ownership
      • Problem 3: Do-it-yourself and custom point-to-point data connections
    • Bad Data: The Costs of Inaction
    • Can We Unify Analytical and Operational Workflows?
  • Rethinking Data with Data Mesh
  • Common Objections to an Event-Driven Data Mesh
    • Producers Cannot Model Data for Everyones Use Cases
    • Making Multiple Copies of Data Is Bad
      • There should only be a single master copy of the data, and all systems should reference it directly
      • Its too computationally expensive to create, store, and update multiple copies of the same data
      • Managing information security policies across systems and distributed data sets is too hard
    • Eventual Consistency Is Too Difficult to Manage
  • Summary
• 2. Data Mesh
  • Principle 1: Domain Ownership
    • Domain-Driven Design in Brief
    • Selecting the Data to Expose from Your Domain
  • Principle 2: Data as a Product
    • Data Products Provide Immutable and Time-Stamped Data
    • Data Products Are Multimodal
    • Accessing a Data Product Via Push or Pull
    • The Three Data Product Alignment Types
      • Source-aligned data products
      • Aggregate-aligned data products
      • Consumer-aligned data products
    • Event-Driven Data Products as Inputs for Operational Systems
  • Principle 3: Federated Governance
    • Specifying Data Product Language, Framework, and API Support
    • Establishing Data Product Life Cycle Requirements
    • Establishing Data Handling and Infosec Policies
    • Identifying and Standardizing Cross-Domain Polysemes
    • Formalizing Self-Service Platform Requirements
  • Principle 4: Self-Service Platform
    • Discovering Data Products and Dependencies
    • Data Product Management Controls
    • Data Product Access Controls
    • Compute and Storage Resources for Building and Using Data Products
    • Providing Self-Service Through SaaS
  • Summary
• 3. Event Streams for Data Mesh
  • Events, Messages, and Records
  • Whats an Event Stream? What Is It Not?
    • Ephemeral Message-Passing
    • Queuing
  • Consuming and Using Event-Driven Data Products
    • State Events and Event-Carried State Transfer
    • Materializing Events
    • Aggregating Events
  • The Kappa Architecture
  • The Lambda Architecture and Why It Doesnt Work for Data Mesh
  • Supporting the Requirements for Kappa Architecture
  • Selecting an Event Broker
  • Summary
• 4. Federated Governance
  • Forming a Federated Governance Team
  • Implementing Standards
    • Supporting Multimodal Data Product Types
    • Supporting Data Product Schemas
    • Supporting Programming Languages and Frameworks
    • Metadata Standards and Requirements
      • Domain and owner
      • Tiered service levels
      • Data quality classifications
      • Privacy, financial, and custom tagging
      • Upstream metadata dependencies
      • Metadata wrap-up example
  • Ensuring Cross-Domain Data Product Compatibility and Interoperability
    • Defining and Using Common Entities
    • Event Stream Keying and Partitioning
    • Time and Time Zones
  • What Does a Governance Meeting Look Like?
    • 1. Identifying Existing Problems
    • 2. Drafting Proposals
    • 3. Reviewing Proposals
    • 4. Implementing Proposals
    • 5. Archiving Proposals
  • Data Security and Access Policies
    • Disable Data Product Access by Default
    • Consider End-to-End Encryption
    • Field-Level Encryption
    • Data Privacy, the Right to Be Forgotten, and Crypto-Shredding
  • Data Product Lineage
    • Topology-Based Lineage
    • Record-Based Lineage
  • Summary
• 5. Self-Service Data Platform
  • The Self-Service Platform Maturity Model
  • Level 1: The Minimal Viable Platform
    • The Schema Registry
    • An Extremely Basic Metadata Catalog
    • Connectors
    • Level 1 Wrap-Up: How Does It Work?
  • Level 2: The Expanded Platform
    • Full-Featured Metadata Catalog
    • The Data Product Management Service and UI
    • Service and User Identities
    • Basic Access Controls
    • Stream Processing for Building Data Products
    • Level 2 Wrap-Up: How Does It Work?
  • Level 3: The Mature Platform
    • Authentication, Identification, and Access Management
    • Integration with Existing Application Delivery Processes
    • Programmatic Data Product Management API
    • Monitoring and Alerting
    • Multiregion and Multicloud Data Products
    • Level 3 Wrap-Up: How Does It Work?
  • Summary
• 6. Event Schemas
  • A Brief Introduction to Serialization and Deserialization
  • What Is a Schema?
  • What Are Our Schema Technology Options?
    • Googles Protocol Buffers, aka Protobuf
    • Apache Avro
    • JSON Schema
  • Schema Evolution: Changing Your Schemas Through Time
  • Negotiating a Breaking Schema Change
    • Step 1: Design the New Data Model
    • Step 2: Iterate with Your Existing Consumers and the Federated Governance Team
    • Step 3. Create a Release Schedule, a Data Migration Plan, and a Deprecation Plan
    • Step 4. Execute the Release
  • The Role of the Schema Registry
  • Best Practices for Managing Schemas in Your Codebase
  • Choosing a Schema Technology
  • Summary
• 7. Designing Events
  • Introduction to Event Types
  • Expanding on State Events and Event-Carried State Transfer
    • Current State Events
    • Before/After State Events
  • Delta Events
    • Event Sourcing with Delta Events
    • Why Delta Events Dont Work for Event-Driven Data Products
      • There is an infinite set of possible event types
      • The logic to interpret the events must be replicated to each consumer
      • These events map poorly to event streams
      • Inversion of ownership: Consumers put their business logic into the producer
      • Inability to maintain historical data without excessive complications
  • Measurement Events
    • Measurement Events Often Form Aggregate-Aligned Data Products
    • Measurement Event Sources May Be Lossy
    • Measurement Events May Power Time-Sensitive Applications
  • Hybrid EventsState with a Bit of Delta
  • Notification Events
  • Summary
• 8. Bootstrapping Data Products
  • Getting Started: Bootstrapping with Connectors
  • Dual Writes
  • Polling the Database to Create Data Products
  • Change-Data Capture
    • Change-Data Capture Using a Transactional Outbox
  • Denormalization and Eventification
    • Eventification at the Transactional Outbox
    • Eventification in a Dedicated Service
    • What Should Go In the Event? And What Should Stay Out?
    • Slowly Changing Dimensions
      • Type 1: Overwrite with the new value
      • Type 2: Append the new value
  • Bootstrapping Cloud Storage Files to an Event Stream
  • Summary
• 9. Integrating Event-Driven Data into Data at Rest
  • Analytics and the Medallion Architecture
  • Connecting Event Streams Into Existing Batch-Data Flows
    • Through the Lens of Data Mesh: Whats Going On?
    • Through the Lens of Data Mesh: How Do We Solve It?
    • Balancing File Sizes, SLAs, and Latency
    • Budget Blues: A Tale of Overspending
  • Extending the Self-Service Platform for Nonstreaming Data Products
  • Summary
• 10. Eventual Consistency
  • Converging on Consistency, One Event at a Time
  • Strategies for Dealing with Eventual Consistency
    • Prevent Failures to Avoid Inconsistency
    • Use Event-Driven Data Products Instead of Request-Response Server API Calls
    • Expose Eventual Consistency in the Server Response
    • Plan for New Services and Reprocessing of Data
    • Synchronize Data Products on Time Boundaries
  • Out-of-Order Events
  • Resolving Late-Arriving Events
  • Summary
• 11. Bringing It All Together
  • Event Streams for Data Mesh
  • Integrating with Existing Systems
  • Operations, Analytics, and Everything in Between
  • Summary
• Index

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