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+ Apache Flink 2.1.2 Release Announcement +

+ + + + May 11, 2026 - + + + + Sergey Nuyanzin + + + + +

The Apache Flink Community is pleased to announce the second bug fix release of the Flink 2.1 series.

+

This release includes 45 bug fixes, vulnerability fixes, and minor improvements for Flink 2.1. +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 2.1.2 or higher.

+

+ Release Artifacts + # +

+

+ Maven Dependencies + # +

+
<dependency>
+  <groupId>org.apache.flink</groupId>
+  <artifactId>flink-java</artifactId>
+  <version>2.1.2</version>
+</dependency>
+<dependency>
+  <groupId>org.apache.flink</groupId>
+  <artifactId>flink-streaming-java</artifactId>
+  <version>2.1.2</version>
+</dependency>
+<dependency>
+  <groupId>org.apache.flink</groupId>
+  <artifactId>flink-clients</artifactId>
+  <version>2.1.2</version>
+</dependency>
+

+ Binaries + # +

+

You can find the binaries on the updated Downloads page.

+

+ Docker Images + # +

+ +

+ PyPi + # +

+ +

+ Release Notes + # +

+
    Release Notes - Flink - Version 2.1.2
+
+

Bug +

+
    +
  • [FLINK-35556] - Wrong constant in RocksDBSharedResourcesFactory.SLOT_SHARED_MANAGED +
    • +
  • [FLINK-37266] - Python CLI arguments doesn't work in session mode +
    • +
  • [FLINK-38399] - As long as the join key includes one of the indexes from the source, the join can be converted into a delta join +
    • +
  • [FLINK-38486] - Harden shutdown of DefaultExpressionEvaluator +
    • +
  • [FLINK-38567] - ForSt state backend error with GROUP BY and async state execution +
    • +
  • [FLINK-38574] - Avoid reusing re-uploaded sst files when checkpoint notification is delayed +
    • +
  • [FLINK-38585] - Pyflink's thread mode may not work when using shipped venv.zip archive as virtual env +
    • +
  • [FLINK-38586] - ClassCastException when using Delta Join with lookup cache +
    • +
  • [FLINK-38624] - Flink 2.1 Job Failure: Type Mismatch Exception in StreamPhysicalOverAggregateRule (TIMESTAMP(3) vs TIMESTAMP(3) ROWTIME) +
    • +
  • [FLINK-38703] - ConcurrentModificationException in FineGrainedResourceManager during reporting metrics +
    • +
  • [FLINK-38704] - Metrics reporter setup does not load Prometheus with correct configs/port +
    • +
  • [FLINK-38750] - Validation of queries with functions erroneously invoked under select fails with StackOverflow +
    • +
  • [FLINK-38797] - PyFlink CsvSchemaBuilder.set_null_value method missing return self +
    • +
  • [FLINK-38815] - The debug log will print the sensitive information of data security cookie certification in task manager and jobmanager +
    • +
  • [FLINK-38916] - MultiJoin produces incorrect results for OR join conditions when parallelism is greater than 1 +
    • +
  • [FLINK-38938] - Restore of SQL job with CURRENT_TIMESTAMP fails with CodeGenException +
    • +
  • [FLINK-38951] - Upgrade pemja to 0.5.6 +
    • +
  • [FLINK-38986] - SSL connection failures in BlobClientSslTest / NettyClientServerSslTest with latest JDK versions +
    • +
  • [FLINK-39015] - Fix MultiJoin RowData behaviour for HeapStateBackend +
    • +
  • [FLINK-39017] - Flink WebUI Job graph node click interaction fails in Chrome 144+ (PointerEvents suppression) +
    • +
  • [FLINK-39052] - ModuleNotFoundError: No module named 'pkg_resources' +
    • +
  • [FLINK-39130] - Allow native types to be used for MetricConfig +
    • +
  • [FLINK-39242] - Method getDataType does not exist error when getting columns from ResolvedSchema +
    • +
  • [FLINK-39355] - Table program cannot be compiled for JSON_OBJECT +
    • +
  • [FLINK-39360] - LIKE clause doesn't support some patterns +
    • +
  • [FLINK-39371] - CurrentDatabase fails for some patterns +
    • +
  • [FLINK-39394] - Job overview metrics (business/backpressure/data skew) are showing N/A when some nodes are finished +
    • +
  • [FLINK-39395] - Add spotless upToDateChecking +
    • +
  • [FLINK-39424] - Setting LIKE does not support default escape characters. +
    • +
+

Improvement +

+
    +
  • [FLINK-37881] - Drop gosu in favour of Dockerfile's USER +
    • +
  • [FLINK-38417] - Ensure attribute ordering when managing join attributes in JoinKeyExtractor +
    • +
  • [FLINK-38445] - Create test plans to validate upsert keys +
    • +
  • [FLINK-38914] - Redirect users to deeplink when visiting an outdated or master docs page (instead of stable) +
    • +
  • [FLINK-38924] - Redirect users to documentation home page when encountering a 404 +
    • +
  • [FLINK-38925] - Update Matomo URL to the right domain +
    • +
  • [FLINK-38955] - Add canonical tag to generated Javadoc and PyDocs +
    • +
  • [FLINK-39139] - Update lz4-java to 1.10.3 +
    • +
+

+
+ + + + + + + +
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