showuon commented on code in PR #19172:
URL: https://github.com/apache/kafka/pull/19172#discussion_r1986687663
##########
docs/upgrade.html:
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@@ -31,6 +31,12 @@ <h5><a id="upgrade_410_notable"
href="#upgrade_410_notable">Notable changes in 4
</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>
+<p>Note: Apache Kafka 4.0 only supports KRaft mode - ZooKeeper mode has been
removed. As such, broker upgrades to 4.0.x (and higher) require KRaft mode and
Review Comment:
I don't know, to be honest, because that's also a notable change in
v4.0.0... Maybe we can hear the 3rd opinion from the community.
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