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Note that Java 11 support for broker and tools is deprecated for removal in 4.0 (#15236) 

Reviewers: Divij Vaidya <diviv@amazon.com>
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Ismael Juma 2024-01-19 14:08:07 -08:00 committed by GitHub
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6
README.md
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@ -6,8 +6,10 @@ You need to have [Java](http://www.oracle.com/technetwork/java/javase/downloads/
We build and test Apache Kafka with Java 8, 11, 17 and 21. We set the `release` parameter in javac and scalac
to `8` to ensure the generated binaries are compatible with Java 8 or higher (independently of the Java version
used for compilation). Java 8 support has been deprecated since Apache Kafka 3.0 and will be removed in Apache
Kafka 4.0 (see [KIP-750](https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=181308223) for more details).
used for compilation). Java 8 support project-wide has been deprecated since Apache Kafka 3.0, Java 11 support for
the broker and tools has been deprecated since Apache Kafka 3.7 and removal of both is planned for Apache Kafka 4.0 (
see [KIP-750](https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=181308223) and
[KIP-1013](https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=284789510) for more details).
Scala 2.12 and 2.13 are supported and 2.13 is used by default. Scala 2.12 support has been deprecated since
Apache Kafka 3.0 and will be removed in Apache Kafka 4.0 (see [KIP-751](https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=181308218)

10
docs/ops.html
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@ -1289,12 +1289,16 @@ $ bin/kafka-acls.sh \
<h3 class="anchor-heading"><a id="java" class="anchor-link"></a><a href="#java">6.6 Java Version</a></h3>
Java 8, Java 11, and Java 17 are supported. Note that Java 8 support has been deprecated since Apache Kafka 3.0 and will be removed in Apache Kafka 4.0.
Java 8, Java 11, and Java 17 are supported.
<p>
Note that Java 8 support project-wide has been deprecated since Apache Kafka 3.0 and Java 11 support for the broker and tools
has been deprecated since Apache Kafka 3.7. Both will be removed in Apache Kafka 4.0.
<p>
Java 11 and later versions perform significantly better if TLS is enabled, so they are highly recommended (they also include a number of other
performance improvements: G1GC, CRC32C, Compact Strings, Thread-Local Handshakes and more).
<p>
From a security perspective, we recommend the latest released patch version as older freely available versions have disclosed security vulnerabilities.
<p>
Typical arguments for running Kafka with OpenJDK-based Java implementations (including Oracle JDK) are:
<pre class="line-numbers"><code class="language-text"> -Xmx6g -Xms6g -XX:MetaspaceSize=96m -XX:+UseG1GC

4
docs/upgrade.html
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@ -23,6 +23,10 @@
<h5><a id="upgrade_370_notable" href="#upgrade_370_notable">Notable changes in 3.7.0</a></h5>
<ul>
<li>Java 11 support for the broker and tools has been deprecated and will be removed in Apache Kafka 4.0. This complements
the previous deprecation of Java 8 for all components. Please refer to
<a href="https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=284789510">KIP-1013</a> for more details.
</li>
<li>More metrics related to Tiered Storage have been introduced. They should improve the operational experience
of running Tiered Storage in production.
For more detailed information, please refer to <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-963%3A+Additional+metrics+in+Tiered+Storage">KIP-963</a>.