apache · snuyanzin · Apr 16, 2026 · Apr 20, 2026 · Apr 21, 2026 · May 4, 2026
diff --git a/docs/content/posts/2026-04-22-release-2.1.2.md b/docs/content/posts/2026-04-22-release-2.1.2.md
@@ -0,0 +1,142 @@
+---
+title:  "Apache Flink 2.1.2 Release Announcement"
+date: "2026-04-22T00:00:00.000Z"
+aliases:
+- /news/2026/04/22/release-2.1.2.html
+authors:
+- snuyanzin:
+  name: "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](https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12315522&version=12356307).
+
+We highly recommend all users upgrade to Flink 2.1.2 or higher.
+
+# Release Artifacts
+
+## Maven Dependencies
+
+```xml
+<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]({{< relref "downloads" >}}).
+
+## Docker Images
+
+* [library/flink](https://hub.docker.com/_/flink/tags?page=1&name=2.1.2) (official images)
+* [apache/flink](https://hub.docker.com/r/apache/flink/tags?page=1&name=2.1.2) (ASF repository)
+
+## PyPi
+
+* [apache-flink==2.1.2](https://pypi.org/project/apache-flink/2.1.2/)
+
+# Release Notes
+
+
+        Release Notes - Flink - Version 2.1.2
+
+<h2>        Bug
+</h2>
+<ul>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-35556'>FLINK-35556</a>] -         Wrong constant in RocksDBSharedResourcesFactory.SLOT_SHARED_MANAGED
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-37266'>FLINK-37266</a>] -         Python CLI arguments doesn&#39;t work in session mode
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38399'>FLINK-38399</a>] -         As long as the join key includes one of the indexes from the source, the join can be converted into a delta join
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38486'>FLINK-38486</a>] -         Harden shutdown of DefaultExpressionEvaluator
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38567'>FLINK-38567</a>] -         ForSt state backend error with GROUP BY and async state execution
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38574'>FLINK-38574</a>] -         Avoid reusing re-uploaded sst files when checkpoint notification is delayed
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38585'>FLINK-38585</a>] -         Pyflink&#39;s thread mode may not work when using shipped venv.zip archive as virtual env
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38586'>FLINK-38586</a>] -         ClassCastException when using Delta Join with lookup cache
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38624'>FLINK-38624</a>] -         Flink 2.1 Job Failure: Type Mismatch Exception in StreamPhysicalOverAggregateRule (TIMESTAMP(3) vs TIMESTAMP(3) ROWTIME)
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38703'>FLINK-38703</a>] -         ConcurrentModificationException in FineGrainedResourceManager during reporting metrics
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38704'>FLINK-38704</a>] -         Metrics reporter setup does not load Prometheus with correct configs/port
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38750'>FLINK-38750</a>] -         Validation of queries with functions erroneously invoked under select fails with StackOverflow
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38797'>FLINK-38797</a>] -         PyFlink CsvSchemaBuilder.set_null_value method missing return self
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38815'>FLINK-38815</a>] -         The debug log will print the sensitive information of data security cookie certification in task manager and jobmanager
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38916'>FLINK-38916</a>] -         MultiJoin produces incorrect results for OR join conditions when parallelism is greater than 1
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38938'>FLINK-38938</a>] -         Restore of SQL job with CURRENT_TIMESTAMP fails with CodeGenException
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38951'>FLINK-38951</a>] -         Upgrade pemja to 0.5.6
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38986'>FLINK-38986</a>] -         SSL connection failures in BlobClientSslTest / NettyClientServerSslTest with latest JDK versions
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-39015'>FLINK-39015</a>] -         Fix MultiJoin RowData behaviour for HeapStateBackend
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-39017'>FLINK-39017</a>] -         Flink WebUI Job graph node click interaction fails in Chrome 144+ (PointerEvents suppression)
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-39052'>FLINK-39052</a>] -         ModuleNotFoundError: No module named &#39;pkg_resources&#39;
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-39130'>FLINK-39130</a>] -         Allow native types to be used for MetricConfig
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-39242'>FLINK-39242</a>] -         Method getDataType does not exist error when getting columns from ResolvedSchema
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-39355'>FLINK-39355</a>] -         Table program cannot be compiled for JSON_OBJECT
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-39360'>FLINK-39360</a>] -         LIKE clause doesn&#39;t support some patterns
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-39371'>FLINK-39371</a>] -         CurrentDatabase fails for some patterns
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-39394'>FLINK-39394</a>] -         Job overview metrics (business/backpressure/data skew) are showing N/A when some nodes are finished
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-39395'>FLINK-39395</a>] -         Add spotless upToDateChecking 
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-39424'>FLINK-39424</a>] -         Setting LIKE does not support default escape characters.
+</li>
+</ul>
+
+<h2>        Improvement
+</h2>
+<ul>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-37881'>FLINK-37881</a>] -         Drop gosu in favour of Dockerfile&#39;s USER
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38417'>FLINK-38417</a>] -         Ensure attribute ordering when managing join attributes in JoinKeyExtractor
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38445'>FLINK-38445</a>] -         Create test plans to validate upsert keys
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38914'>FLINK-38914</a>] -         Redirect users to deeplink when visiting an outdated or master docs page (instead of stable)
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38924'>FLINK-38924</a>] -         Redirect users to documentation home page when encountering a 404
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38925'>FLINK-38925</a>] -         Update Matomo URL to the right domain
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-38955'>FLINK-38955</a>] -         Add canonical tag to generated Javadoc and PyDocs
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/FLINK-39139'>FLINK-39139</a>] -         Update lz4-java to 1.10.3
+</li>
+</ul>
diff --git a/docs/data/flink.yml b/docs/data/flink.yml
@@ -25,13 +25,13 @@
   source_release_sha512_url: "https://downloads.apache.org/flink/flink-2.2.0/flink-2.2.0-src.tgz.sha512"
 
 2.1:
-  name: "Apache Flink 2.1.1"
-  binary_release_url: "https://www.apache.org/dyn/closer.lua/flink/flink-2.1.1/flink-2.1.1-bin-scala_2.12.tgz"
-  binary_release_asc_url: "https://downloads.apache.org/flink/flink-2.1.1/flink-2.1.1-bin-scala_2.12.tgz.asc"
-  binary_release_sha512_url: "https://downloads.apache.org/flink/flink-2.1.1/flink-2.1.1-bin-scala_2.12.tgz.sha512"
-  source_release_url: "https://www.apache.org/dyn/closer.lua/flink/flink-2.1.1/flink-2.1.1-src.tgz"
-  source_release_asc_url: "https://downloads.apache.org/flink/flink-2.1.1/flink-2.1.1-src.tgz.asc"
-  source_release_sha512_url: "https://downloads.apache.org/flink/flink-2.1.1/flink-2.1.1-src.tgz.sha512"
+  name: "Apache Flink 2.1.2"
+  binary_release_url: "https://www.apache.org/dyn/closer.lua/flink/flink-2.1.2/flink-2.1.2-bin-scala_2.12.tgz"
+  binary_release_asc_url: "https://downloads.apache.org/flink/flink-2.1.2/flink-2.1.2-bin-scala_2.12.tgz.asc"
+  binary_release_sha512_url: "https://downloads.apache.org/flink/flink-2.1.2/flink-2.1.2-bin-scala_2.12.tgz.sha512"
+  source_release_url: "https://www.apache.org/dyn/closer.lua/flink/flink-2.1.2/flink-2.1.2-src.tgz"
+  source_release_asc_url: "https://downloads.apache.org/flink/flink-2.1.2/flink-2.1.2-src.tgz.asc"
+  source_release_sha512_url: "https://downloads.apache.org/flink/flink-2.1.2/flink-2.1.2-src.tgz.sha512"
 
 2.0:
   name: "Apache Flink 2.0.1"

diff --git a/docs/data/release_archive.yml b/docs/data/release_archive.yml
@@ -1,5 +1,8 @@
 release_archive:
   flink:
+    - version_short: "2.1"
+      version_long: 2.1.2
+      release_date: 2026-04-22
     -
       version_short: "2.2"
       version_long: 2.2.0