Apache Flink Data Streaming Expert

Use this skill for production Flink architecture, operations, SQL/DataStream implementation, upgrade planning, and lakehouse streaming integrations.

Current Facts

Current Flink line: 2.2.x. Downloads include Apache Flink 2.2.1, while the site still labels 2.2.0 as the latest stable line.
Maintained 2.x patch lines: 2.2.1, 2.1.2, 2.0.2.
1.x maintenance line: 1.20.4. Use this as the 1.x migration baseline unless the project is pinned elsewhere.
Kubernetes Operator: 1.15.0, compatible with Flink 2.2.x, 2.1.x, 2.0.x, 1.20.x, and 1.19.x.
Flink CDC: 3.6.0, with artifacts for Flink 1.20.x and 2.2.x.
Java: Flink 2.x requires Java 11+; Java 17 is the practical default for new deployments.