The Apache Flink Community is pleased to announce the first bug fix release of the Flink 2.2 series.
This release includes 44 bug fixes, vulnerability fixes, and minor improvements for Flink 2.2. Below you will find a list of all bug fixes and improvements (excluding improvements to the build infrastructure and build stability). For a complete list of all changes see: JIRA.
We highly recommend all users upgrade to Flink 2.

Flink is an open-source stream processing framework for building real-time data applications, offering powerful features for data processing, analytics, and event-driven architectures. Developers can learn about stream processing concepts, event-driven architectures, and real-time analytics techniques to build scalable and fault-tolerant data pipelines for processing large volumes of data in real-time.

Flink

Apache Flink 2.2.1 is the first bug fix release in the Flink 2.2 series, containing 44 bug fixes, vulnerability fixes, and minor improvements. Key fixes address Flink SQL issues (UNNEST with LEFT JOIN, MultiJoin incorrect results, MATCH_RECOGNIZE parsing, JSON_OBJECT compilation), PyFlink thread mode and virtual environment problems, data corruption with custom partitioners and unaligned checkpoints, sensitive data exposure in debug logs, SSL connection failures with newer JDK versions, and Flink WebUI breakage in Chrome 144+. Improvements include AdaptiveScheduler transition acceleration, splittable timers in Interval Join, and updated cipher suite defaults. All users on Flink 2.2 are strongly recommended to upgrade.

Apache Flink 2.2.1 Release Announcement