michaeljmarshall commented on a change in pull request #14458:
URL: https://github.com/apache/pulsar/pull/14458#discussion_r814494767



##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java
##########
@@ -1273,6 +1273,17 @@ protected void handleProducer(final CommandProducer 
cmdProducer) {
                             if (!Strings.isNullOrEmpty(initialSubscriptionName)
                                     && topic.isPersistent()
                                     && 
!topic.getSubscriptions().containsKey(initialSubscriptionName)) {
+                                if 
(!this.getBrokerService().isAllowAutoSubscriptionCreation(topicName)) {
+                                    String msg =
+                                            "Could not create the initial 
subscription due to the auto subscription "
+                                                    + "creation is not 
allowed.";
+                                    log.warn("[{}] {} initialSubscriptionName: 
{}, topic: {}",
+                                            remoteAddress, msg, 
initialSubscriptionName, topicName);
+                                    commandSender.sendErrorResponse(requestId,

Review comment:
       Great catch @Jason918. @RobertIndie, see 
https://github.com/apache/pulsar/pull/14467 for an example.

##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java
##########
@@ -1273,6 +1273,17 @@ protected void handleProducer(final CommandProducer 
cmdProducer) {
                             if (!Strings.isNullOrEmpty(initialSubscriptionName)
                                     && topic.isPersistent()
                                     && 
!topic.getSubscriptions().containsKey(initialSubscriptionName)) {
+                                if 
(!this.getBrokerService().isAllowAutoSubscriptionCreation(topicName)) {
+                                    String msg =
+                                            "Could not create the initial 
subscription due to the auto subscription "
+                                                    + "creation is not 
allowed.";

Review comment:
       @RobertIndie - is it documented that the DLQ producer will fail to 
create in this case?




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