lhotari commented on code in PR #23642:
URL: https://github.com/apache/pulsar/pull/23642#discussion_r1858721612


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/lookup/TopicLookupBase.java:
##########
@@ -342,6 +343,22 @@ public static CompletableFuture<ByteBuf> 
lookupTopicAsync(PulsarService pulsarSe
         return lookupfuture;
     }
 
+    /**
+     * Check if a internal client will get a null lookup result.
+     */
+    private static void printWarnLogIfLookupResUnexpected(TopicName topic, 
LookupData lookupData,
+                                                          PulsarService 
pulsar) {
+        if (!pulsar.getBrokerService().isSystemTopic(topic)) {
+            return;
+        }
+        boolean tlsEnabled = pulsar.getConfig().isBrokerClientTlsEnabled();
+        if (!tlsEnabled && StringUtils.isBlank(lookupData.getBrokerUrl())) {
+            log.warn("[{}] Unexpected lookup result {}", topic.toString(), 
lookupData);
+        } else if (tlsEnabled && 
StringUtils.isBlank(lookupData.getBrokerUrlTls())) {
+            log.warn("[{}] Unexpected lookup result {}", topic.toString(), 
lookupData);

Review Comment:
   It would be useful to improve the log message to be explicit about why it's 
unexpected by adding "brokerUrlTls is required when TLS is enabled."



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