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Gunnar Morling Software Engineer, Red Hat @gunnarmorling Change Data Streaming Patterns in Distributed Systems Hans-Peter Grahsl Technical Trainer, Netconomy @hpgrahsl

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#CDCPatterns @gunnarmorling @hpgrahsl … implemented using Change Data Capture Today’s Objectives

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#CDCPatterns @gunnarmorling @hpgrahsl ● Open source software engineer at Red Hat ○ Debezium ○ Quarkus ● Spec Lead for Bean Validation 2.0 ● Java Champion ● @gunnarmorling Gunnar Morling

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#CDCPatterns @gunnarmorling @hpgrahsl ● Technical Trainer at NETCONOMY ● Independent Engineer & Consultant ● Confluent Community Catalyst ● MongoDB Champion ● @hpgrahsl Hans-Peter Grahsl

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#CDCPatterns @gunnarmorling @hpgrahsl ● Taps into TX log to capture INSERT/UPDATE/DELETE events ● Propagated to consumers via Apache Kafka and Kafka Connect Debezium — Log-based Change Data Capture

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#CDCPatterns @gunnarmorling @hpgrahsl Debezium in a Nutshell ● A CDC Platform ■ Based on transaction logs ■ Snapshotting, filtering, etc. ■ Outbox support ■ Web-based UI ● Fully open-source, very active community ● Large production deployments

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#CDCPatterns @gunnarmorling @hpgrahsl Debezium: Connectors ● Stable ■ MySQL ■ Postgres ■ MongoDB ■ SQL Server ■ Db2 ■ Oracle ● Incubating ■ Vitess ■ Cassandra

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#CDCPatterns @gunnarmorling @hpgrahsl Debezium: Deployment Alternatives Embedded Engine and Debezium Server

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#CDCPatterns @gunnarmorling @hpgrahsl Data Change Events ● Old and new row state ● Metadata on table, TX id, etc. ● Operation type, timestamp

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#CDCPatterns @gunnarmorling @hpgrahsl ● Old and new row state ● Metadata on table, TX id, etc. ● Operation type, timestamp Data Change Events

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#CDCPatterns @gunnarmorling @hpgrahsl ● Old and new row state ● Metadata on table, TX id, etc. ● Operation type, timestamp Data Change Events

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Outbox Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl ● Services need to update their database, ● send messages to other services, ● and that consistently! Challenge: Microservices Data Exchange

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#CDCPatterns @gunnarmorling @hpgrahsl “Dual writes” are prone to inconsistencies! Outbox Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl Outbox Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl Outbox Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl Outbox Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl Outbox Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl Outbox Pattern with enrichment from external system using Flink

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#CDCPatterns @gunnarmorling @hpgrahsl Integrating Debezium With Apache Flink Debezium → Kafka Topic → Flink

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#CDCPatterns @gunnarmorling @hpgrahsl Integrating Debezium With Apache Flink Flink CDC Connectors (Debezium Embedded Engine) → Flink

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Strangler Fig Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl ● Gradually evolve from old into new ● Support temporary coexistence ● Avoid big bang cut-over Challenge: Migrating Systems

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#CDCPatterns @gunnarmorling @hpgrahsl CDC-based Strangler Fig Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl CDC-based Strangler Fig Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl CDC-based Strangler Fig Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl CDC-based Strangler Fig Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl CDC-based Strangler Fig Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl CDC-based Strangler Fig Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl CDC-based Strangler Fig Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl CDC-based Strangler Fig Pattern Demo Repo: https://bit.ly/ff21-sfp

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#CDCPatterns @gunnarmorling @hpgrahsl ● Incremental migration → “baby steps” ● Pause or stop migration without losing spent efforts ● Migration steps ideally reversible Rationale: ⚠ minimize risk ⚠ Benefits

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#CDCPatterns @gunnarmorling @hpgrahsl CDC Pipeline Considerations ● data model leaking from monolith ? ● “1:1 replication” → building aggregates ?

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#CDCPatterns @gunnarmorling @hpgrahsl Enhanced CDC Processing Single Message Transforms

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#CDCPatterns @gunnarmorling @hpgrahsl Enhanced CDC Processing custom stream processing with Flink

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#CDCPatterns @gunnarmorling @hpgrahsl Example: join with custom aggregation

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#CDCPatterns @gunnarmorling @hpgrahsl Example: join with custom aggregation Flink Table API

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#CDCPatterns @gunnarmorling @hpgrahsl Example: join with custom aggregation Flink SQL

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Saga Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl ● Multiple services need to act collaboratively to achieve a consistent outcome ● Without 2-phase commit protocols ● Ensure correctness in case of failures Challenge: Long-running Business Transactions

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#CDCPatterns @gunnarmorling @hpgrahsl Saga Pattern

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#CDCPatterns @gunnarmorling @hpgrahsl Saga Pattern Message Flow

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#CDCPatterns @gunnarmorling @hpgrahsl Saga Pattern Compensation

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#CDCPatterns @gunnarmorling @hpgrahsl Saga Pattern Configuration

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#CDCPatterns @gunnarmorling @hpgrahsl Saga Pattern Execution Flow

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#CDCPatterns @gunnarmorling @hpgrahsl Saga Pattern Execution Flow

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#CDCPatterns @gunnarmorling @hpgrahsl Saga Pattern Execution Flow

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#CDCPatterns @gunnarmorling @hpgrahsl Saga Pattern Expanding Partial Change Events with Flink

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#CDCPatterns @gunnarmorling @hpgrahsl Saga Pattern Expanding Partial Change Events with Flink

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Wrap-Up

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#CDCPatterns @gunnarmorling @hpgrahsl ● CDC: a powerful tool in the box for event-driven architectures ● Debezium: open-source CDC for a variety of databases ● Debezium + Apache Flink = ❤ Takeaways

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#CDCPatterns @gunnarmorling @hpgrahsl ● Outbox implementation https://debezium.io/blog/2019/02/19/reliable-microservices-data -exchange-with-the-outbox-pattern/ ● Strangler fig pattern https://martinfowler.com/bliki/StranglerFigApplication.html ● Saga implementation https://www.infoq.com/articles/saga-orchestration-outbox/ ● Demo repo https://github.com/debezium/debezium-examples Resources

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#CDCPatterns @gunnarmorling @hpgrahsl Q & A gunnar@hibernate.org @gunnarmorling 📧 grahslhp@gmail.com @hpgrahsl 📧 Thank You!

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