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KAFKA-18422: add Kafka client upgrade path #19097

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KAFKA-18422: add Kafka client upgrade path #19097

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KAFKA-18422: add Kafka client upgrade path
brandboat Mar 4, 2025
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brandboat Mar 4, 2025
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Merge remote-tracking branch 'origin/trunk' into KAFKA-18422
brandboat Mar 4, 2025
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3 changes: 3 additions & 0 deletions docs/upgrade.html
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Expand Up @@ -46,6 +46,9 @@ <h4><a id="upgrade_4_0_0" href="#upgrade_4_0_0">Upgrading to 4.0.0 from any vers
Every <a href="https://github.com/apache/kafka/blob/trunk/server-common/src/main/java/org/apache/kafka/server/common/MetadataVersion.java">MetadataVersion</a>
has a boolean parameter that indicates if there are metadata changes (i.e. <code>IBP_4_0_IV1(23, "4.0", "IV1", true)</code> means this version has metadata changes).
Given your current and target versions, a downgrade is only possible if there are no metadata changes in the versions between.</li>
<li>For the Kafka client upgrade path, note that many deprecated APIs were removed in Kafka 4.0. Additionally, upgrading directly to 4.x from certain versions is not feasible.
For more information, please refer to <a href="https://cwiki.apache.org/confluence/x/y4kgF">KIP-1124</a>.
</li>
</ol>

<h5><a id="upgrade_400_notable" href="#upgrade_400_notable">Notable changes in 4.0.0</a></h5>
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