jsancio commented on code in PR #19416:
URL: https://github.com/apache/kafka/pull/19416#discussion_r2050845404
##########
raft/src/main/java/org/apache/kafka/raft/LeaderState.java:
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@@ -416,14 +476,192 @@ public void requestResign() {
this.resignRequested = true;
}
+ /**
+ * Upgrade the kraft version.
+ *
+ * This methods upgradeds the kraft version to {@code newVersion}. If the
version is already
+ * {@code newVersion}, this is a noop operation.
+ *
+ * KRaft only supports upgrades, so {@code newVersion} must be greater
than or equal to curent
+ * kraft version {@code persistedVersion}.
+ *
+ * For the upgrade to succeed all of the voters in the voter set must
support the new kraft
+ * version. The upgrade from kraft version 0 to kraft version 1 generate
one control batch
+ * with one control record setting the kraft version to 1 and one voters
record setting the
+ * updated voter set.
+ *
+ * When {@code validateOnly} is true only the validation is perform and
the control records are
+ * not generated.
+ *
+ * @param epoch the current epoch
Review Comment:
Fixed.
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