Technoboy- commented on a change in pull request #14059:
URL: https://github.com/apache/pulsar/pull/14059#discussion_r802414484



##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/v1/PersistentTopics.java
##########
@@ -90,10 +89,27 @@ public void getList(@Suspended final AsyncResponse 
asyncResponse, @PathParam("pr
     @ApiResponses(value = {
             @ApiResponse(code = 403, message = "Don't have admin or operate 
permission on the namespace"),
             @ApiResponse(code = 404, message = "Namespace doesn't exist")})
-    public List<String> getPartitionedTopicList(@PathParam("property") String 
property,
-            @PathParam("cluster") String cluster, @PathParam("namespace") 
String namespace) {
-        validateNamespaceName(property, cluster, namespace);
-        return internalGetPartitionedTopicList();
+    public void getPartitionedTopicList(@Suspended AsyncResponse asyncResponse,
+                                        @PathParam("property") String property,
+                                        @PathParam("cluster") String cluster,
+                                        @PathParam("namespace") String 
namespace) {
+        try {
+            validateNamespaceName(property, cluster, namespace);
+        } catch (Exception ex) {
+            // validate namespace fail.
+            resumeAsyncResponseExceptionally(asyncResponse, ex);
+            return;
+        }
+        internalGetPartitionedTopicList()
+            .thenAccept(partitionedTopicList -> {
+                log.info("[{}] Successfully to get partitioned topic list 
{}/{}",
+                        clientAppId(), cluster, namespace);
+                asyncResponse.resume(partitionedTopicList);
+            }).exceptionally(ex -> {
+                log.error("[{}] Failed to get partitioned topic list {}", 
clientAppId(), namespaceName, ex);
+                resumeAsyncResponseExceptionally(asyncResponse, ex);

Review comment:
       ex -> ex.getCause




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