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KAFKA-19748: Add a note in docs about memory leak in Kafka Streams 4.1.0 #20639

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Oct 6, 2025
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KAFKA-19748: Add a note in docs about memory leak in Kafka Streams 4.1.0 #20639

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2 changes: 2 additions & 0 deletions docs/streams/upgrade-guide.html
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Expand Up @@ -110,6 +110,8 @@ <h3 class="anchor-heading"><a id="streams_notable_changes" class="anchor-link"><

<h3><a id="streams_api_changes_410" href="#streams_api_changes_410">Streams API changes in 4.1.0</a></h3>

<p><b>Note:</b> Kafka Streams 4.1.0 contains a critical memory leak bug (<a href="https://issues.apache.org/jira/browse/KAFKA-19748">KAFKA-19748</a>) that affects users of range scans and certain DSL operators (session windows, sliding windows, stream-stream joins, foreign-key joins). Users running Kafka Streams should consider upgrading directly to 4.1.1 when available.</p>

<h4>Early Access of the Streams Rebalance Protocol</h4>

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2 changes: 2 additions & 0 deletions docs/upgrade.html
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Expand Up @@ -193,6 +193,8 @@ <h5><a id="upgrade_420_notable" href="#upgrade_420_notable">Notable changes in 4

<h4><a id="upgrade_4_1_0" href="#upgrade_4_1_0">Upgrading to 4.1.0</a></h4>

<p><b>Note:</b> Kafka Streams 4.1.0 contains a critical memory leak bug (<a href="https://issues.apache.org/jira/browse/KAFKA-19748">KAFKA-19748</a>) that affects users of range scans and certain DSL operators (session windows, sliding windows, stream-stream joins, foreign-key joins). Users running Kafka Streams should consider upgrading directly to 4.1.1 when available.</p>

<h5><a id="upgrade_4_1_0_from" href="#upgrade_4_1_0_from">Upgrading Servers to 4.1.0 from any version 3.3.x through 4.0.x</a></h5>
<h5><a id="upgrade_410_notable" href="#upgrade_410_notable">Notable changes in 4.1.0</a></h5>
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