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| <h1> |
| <a href="/2025/07/10/apache-flink-1.20.2-release-announcement/">Apache Flink 1.20.2 Release Announcement</a> |
| </h1> |
| |
| |
| |
| July 10, 2025 - |
| |
| |
| |
| Ferenc Csaky |
| |
| |
| |
| |
| <p><p>The Apache Flink Community is pleased to announce the second bug fix release of the Flink 1.20 series.</p> |
| <p>This release includes 25 bug fixes, vulnerability fixes, and minor improvements for Flink 1.20. |
| Below you will find a list of all bugfixes and improvements (excluding improvements to the build infrastructure and build stability). For a complete list of all changes see: |
| <a href="https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12315522&version=12355442">JIRA</a>.</p> |
| <p>We highly recommend all users upgrade to Flink 1.20.2 or higher.</p> |
| <div class="alert alert-warning" role="alert"> |
| <b>Note:</b> This release contains an improvement regarding how the Adaptive Scheduler works by default on Kubernetes deployments. |
| <p>Beforehand, in case of a downscaling, the Adaptive Scheduler was not striving to minimize the active TaskManager number, and free up resources even if it had been possible. |
| This logic is now changed and by default the Adaptive Scheduler will try to maximize TaskManager utilization during a downscale event to be able to minimize the necessary TaskManager number.</p> |
| <p>Although this behavioral change pushes the boundaries of a patch release, the community agreed that the applied default is expected in the vast majority of use cases. |
| To keep the previous strategy, make sure you set the <code>jobmanager.adaptive-scheduler.prefer-minimal-taskmanagers</code> configuration option to <code>false</code>. |
| For more details, please see <a href='https://issues.apache.org/jira/browse/FLINK-33977'>FLINK-33977</a>.</p> |
| </div> |
| <h1 id="release-artifacts"> |
| Release Artifacts |
| <a class="anchor" href="#release-artifacts">#</a> |
| </h1> |
| <h2 id="maven-dependencies"> |
| Maven Dependencies |
| <a class="anchor" href="#maven-dependencies">#</a> |
| </h2> |
| <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-xml" data-lang="xml"><span class="line"><span class="cl"><span class="nt"><dependency></span> |
| </span></span><span class="line"><span class="cl"> <span class="nt"><groupId></span>org.apache.flink<span class="nt"></groupId></span> |
| </span></span><span class="line"><span class="cl"> <span class="nt"><artifactId></span>flink-java<span class="nt"></artifactId></span> |
| </span></span><span class="line"><span class="cl"> <span class="nt"><version></span>1.20.2<span class="nt"></version></span> |
| </span></span><span class="line"><span class="cl"><span class="nt"></dependency></span> |
| </span></span><span class="line"><span class="cl"><span class="nt"><dependency></span> |
| </span></span><span class="line"><span class="cl"> <span class="nt"><groupId></span>org.apache.flink<span class="nt"></groupId></span> |
| </span></span><span class="line"><span class="cl"> <span class="nt"><artifactId></span>flink-streaming-java<span class="nt"></artifactId></span> |
| </span></span><span class="line"><span class="cl"> <span class="nt"><version></span>1.20.2<span class="nt"></version></span> |
| </span></span><span class="line"><span class="cl"><span class="nt"></dependency></span> |
| </span></span><span class="line"><span class="cl"><span class="nt"><dependency></span> |
| </span></span><span class="line"><span class="cl"> <span class="nt"><groupId></span>org.apache.flink<span class="nt"></groupId></span> |
| </span></span><span class="line"><span class="cl"> <span class="nt"><artifactId></span>flink-clients<span class="nt"></artifactId></span> |
| </span></span><span class="line"><span class="cl"> <span class="nt"><version></span>1.20.2<span class="nt"></version></span> |
| </span></span><span class="line"><span class="cl"><span class="nt"></dependency></span> |
| </span></span></code></pre></div><h2 id="binaries"> |
| Binaries |
| <a class="anchor" href="#binaries">#</a> |
| </h2> |
| <p>You can find the binaries on the updated <a href="/downloads/">Downloads page</a>.</p> |
| <h2 id="docker-images"> |
| Docker Images |
| <a class="anchor" href="#docker-images">#</a> |
| </h2> |
| <ul> |
| <li><a href="https://hub.docker.com/_/flink/tags?page=1&name=1.20.2">library/flink</a> (official images)</li> |
| <li><a href="https://hub.docker.com/r/apache/flink/tags?page=1&name=1.20.2">apache/flink</a> (ASF repository)</li> |
| </ul> |
| <h2 id="pypi"> |
| PyPi |
| <a class="anchor" href="#pypi">#</a> |
| </h2> |
| <ul> |
| <li><a href="https://pypi.org/project/apache-flink/1.20.2/">apache-flink==1.20.2</a></li> |
| </ul> |
| <h1 id="release-notes"> |
| Release Notes |
| <a class="anchor" href="#release-notes">#</a> |
| </h1> |
| <pre><code> Release Notes - Flink - Version 1.20.2 |
| </code></pre> |
| <h2> Bug |
| </h2> |
| <ul> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-30687'>FLINK-30687</a>] - FILTER not effect in count(*) |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-34227'>FLINK-34227</a>] - Job doesn't disconnect from ResourceManager |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-35117'>FLINK-35117</a>] - AsyncScalarFunction has a dependency issue. |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-35687'>FLINK-35687</a>] - JSON_QUERY should return a well formatted nested objects/arrays for ARRAY<STRING> |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-36549'>FLINK-36549</a>] - Using the ignore-parse-errors parameter in Debezium/Canal/Maxwell/Ogg JSON results in unexpected data loss. |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37205'>FLINK-37205</a>] - Correct the state cache behavior during bump beam version |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37460'>FLINK-37460</a>] - Using State Processor API and Kafka Sink with Exactly once delivery leads to org.apache.kafka.common.errors.InvalidPidMappingException |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37480'>FLINK-37480</a>] - Jpicmp gives false positive |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37505'>FLINK-37505</a>] - Pyflink is not able to handle the new YAML based configs |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37545'>FLINK-37545</a>] - StackOverflowError when using MetricGroup in custom WatermarkStrategy |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37557'>FLINK-37557</a>] - ResolvedSchema#getPrimaryKeyIndexes does not filter for physical columns |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37605'>FLINK-37605</a>] - SinkWriter may incorrectly infer end of input during rescale |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37609'>FLINK-37609</a>] - Bump parquet libs to 1.15.1 |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37670'>FLINK-37670</a>] - Watermark alignment can deadlock job if there are no more splits to be assigned |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37760'>FLINK-37760</a>] - Bump parquet version to 1.15.2 |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37803'>FLINK-37803</a>] - LocalTime without seconds is incorrectly serialized to SQL as a value literal |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37820'>FLINK-37820</a>] - AsyncScalarFunction UDFs cannot be loaded via CompiledPlan |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37833'>FLINK-37833</a>] - Code generated for binary key in BatchExecExchange causes incorrect shuffle |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37870'>FLINK-37870</a>] - Unaligned checkpoint is disabled for all connections unexpectedly |
| </li> |
| </ul> |
| <h2> Improvement |
| </h2> |
| <ul> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-33977'>FLINK-33977</a>] - Adaptive scheduler may not minimize the number of TMs during downscaling |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37109'>FLINK-37109</a>] - Improve state processor API performance when reading keyed rocksdb state by allowing duplicates |
| </li> |
| </ul> |
| <h2> Technical Debt |
| </h2> |
| <ul> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37241'>FLINK-37241</a>] - Remove Mockito dependency from StateBackendTestBase |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37360'>FLINK-37360</a>] - Update japicmp configuration post 1.20.1 |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37804'>FLINK-37804</a>] - Python failed to build wheels on macos |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-37810'>FLINK-37810</a>] - update log4j to 2.24.3 to fix critical vulnerabilities |
| </li> |
| </ul> |
| </p> |
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