gabriellefu commented on code in PR #23121:
URL: https://github.com/apache/kafka/pull/23121#discussion_r3868428573
##########
core/src/main/scala/kafka/server/ControllerConfigurationValidator.scala:
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@@ -39,6 +40,14 @@ import scala.collection.mutable
* the controller. Therefore, the validation here is just a kind of sanity
check, which
* should never fail under normal conditions.
*
+ * GROUP resources are validated here too, via {@link
GroupConfig#validateOnController}, even
+ * though the forwarding broker already performs the same full validation in
+ * {@link kafka.server.ConfigAdminManager#preprocess()} via {@link
GroupConfig#validateOnBroker}.
+ * This is kept, gated on {@code metadataVersion}, so that the cluster is
never left without GROUP
+ * config validation while it may still contain brokers that predate the
broker-side check
+ * (KAFKA-20790). It can be dropped once upgrading directly from a pre-{@link
MetadataVersion#IBP_4_5_IV0}
+ * cluster is no longer supported.
Review Comment:
updated that, thanks
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