nodece commented on code in PR #16221:
URL: https://github.com/apache/pulsar/pull/16221#discussion_r907999571


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/PersistentTopicsBase.java:
##########
@@ -4251,7 +4243,7 @@ private RestException topicNotFoundReason(TopicName 
topicName) {
                     == null ? "has no metadata" : "has zero partitions";
             return new RestException(Status.NOT_FOUND, String.format(
                     "Partitioned Topic not found: %s %s", 
topicName.toString(), topicErrorType));
-        } else if 
(!internalGetList(Optional.empty()).contains(topicName.toString())) {
+        } else if 
(!internalGetListAsync(Optional.empty()).join().contains(topicName.toString())) 
{

Review Comment:
   We need to avoid using the `join()` and `get()`.



##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/PersistentTopicsBase.java:
##########
@@ -4271,7 +4263,7 @@ private CompletableFuture<Topic> 
topicNotFoundReasonAsync(TopicName topicName) {
                                 == null ? "has no metadata" : "has zero 
partitions";
                         throw new RestException(Status.NOT_FOUND, 
String.format(
                                 "Partitioned Topic not found: %s %s", 
topicName.toString(), topicErrorType));
-                    } else if 
(!internalGetList(Optional.empty()).contains(topicName.toString())) {
+                    } else if 
(!internalGetListAsync(Optional.empty()).join().contains(topicName.toString())) 
{

Review Comment:
   We need to avoid using the `join()` and `get()`.



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