philipnee commented on code in PR #14638:
URL: https://github.com/apache/kafka/pull/14638#discussion_r1372118635
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/SubscriptionState.java:
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@@ -162,13 +162,13 @@ else if (this.subscriptionType != type)
throw new IllegalStateException(SUBSCRIPTION_EXCEPTION_MESSAGE);
}
- public synchronized boolean subscribe(Set<String> topics,
ConsumerRebalanceListener listener) {
+ public synchronized boolean subscribe(Set<String> topics,
Optional<ConsumerRebalanceListener> listener) {
Review Comment:
Actually - is listener actually optional here? It seems like if the listener
is null, it should complain?
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