mingdaoy commented on code in PR #19119:
URL: https://github.com/apache/kafka/pull/19119#discussion_r1991109201
##########
docs/upgrade.html:
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@@ -29,7 +31,26 @@ <h5><a id="upgrade_410_notable"
href="#upgrade_410_notable">Notable changes in 4
</ul>
</li>
</ul>
-<h4><a id="upgrade_4_0_0" href="#upgrade_4_0_0">Upgrading to 4.0.0 from any
version 3.3.x through 3.9.x</a></h4>
+
+<h4><a id="upgrade_4_0_0" href="#upgrade_4_0_0">Upgrading to 4.0.0</a></h4>
+
+<h5><a id="upgrade_clients_4_0_0" href="#upgrade_clients_4_0_0">Upgrading
Clients to 4.0.0</a></h5>
+
+<p><b>For a rolling upgrade:</b></p>
+
+<ol>
+ <li>Upgrade the clients one at a time: shut down the client, update the
code, and restart it.</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>
Review Comment:
I changed it to the following,
> For the Kafka client upgrade path, note that many deprecated APIs were
removed in Kafka 4.0. Additionally, upgrading directly **from certain versions,
such as 2.0 clients (or older)**, to 4.x is not feasible. **2.1 is the oldest
supported version compatible with 4.0**
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