ijuma commented on code in PR #19097:
URL: https://github.com/apache/kafka/pull/19097#discussion_r1981526593
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docs/upgrade.html:
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@@ -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.
Review Comment:
This seems to be in the wrong place. It's under the header:
> <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>
Perhaps we should adjust the title to say "Upgrading brokers from any
version..." and then have a separate header for Clients.
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