mattisonchao commented on code in PR #15518:
URL: https://github.com/apache/pulsar/pull/15518#discussion_r869232194


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/v1/Namespaces.java:
##########
@@ -187,7 +208,17 @@ public void createNamespace(@PathParam("property") String 
property, @PathParam("
             policies.bundles = getBundles(defaultNumberOfBundles);
         }
 
-        internalCreateNamespace(policies);
+        internalCreateNamespace(policies)
+                .thenAccept(__ -> 
response.resume(Response.noContent().build()))
+                .exceptionally(ex -> {
+                    Throwable root = FutureUtil.unwrapCompletionException(ex);

Review Comment:
   Should we add an error log here?



##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/v2/Namespaces.java:
##########
@@ -139,11 +155,23 @@ public Policies getPolicies(@PathParam("tenant") String 
tenant, @PathParam("name
             @ApiResponse(code = 404, message = "Tenant or cluster doesn't 
exist"),
             @ApiResponse(code = 409, message = "Namespace already exists"),
             @ApiResponse(code = 412, message = "Namespace name is not valid") 
})
-    public void createNamespace(@PathParam("tenant") String tenant, 
@PathParam("namespace") String namespace,
-            @ApiParam(value = "Policies for the namespace") Policies policies) 
{
+    public void createNamespace(@Suspended AsyncResponse response,
+                                @PathParam("tenant") String tenant,
+                                @PathParam("namespace") String namespace,
+                                @ApiParam(value = "Policies for the 
namespace") Policies policies) {
         validateNamespaceName(tenant, namespace);
         policies = getDefaultPolicesIfNull(policies);
-        internalCreateNamespace(policies);
+        internalCreateNamespace(policies)
+                .thenAccept(__ -> 
response.resume(Response.noContent().build()))
+                .exceptionally(ex -> {
+                    Throwable root = FutureUtil.unwrapCompletionException(ex);

Review Comment:
   Should we add an error log here?



##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/v1/Namespaces.java:
##########
@@ -187,7 +208,17 @@ public void createNamespace(@PathParam("property") String 
property, @PathParam("
             policies.bundles = getBundles(defaultNumberOfBundles);
         }
 
-        internalCreateNamespace(policies);
+        internalCreateNamespace(policies)

Review Comment:
   line 196 `validateClusterForTenant(namespaceName.getTenant(), 
namespaceName.getCluster())` looks like a sync method that can be async.



##########
pulsar-broker-common/src/main/java/org/apache/pulsar/broker/resources/TenantResources.java:
##########
@@ -110,6 +110,40 @@ public List<String> getListOfNamespaces(String tenant) 
throws MetadataStoreExcep
         return namespaces;
     }
 
+    public CompletableFuture<List<String>> getListOfNamespacesAsync(String 
tenant) {
+        List<String> namespaces = new ArrayList<>();
+        // this will return a cluster in v1 and a namespace in v2
+        CompletableFuture<List<CompletableFuture<Void>>> result = 
getChildrenAsync(joinPath(BASE_POLICIES_PATH, tenant))
+                .thenApply(clusterOrNamespaces -> 
clusterOrNamespaces.stream().map(key ->
+                        getChildrenAsync(joinPath(BASE_POLICIES_PATH, tenant, 
key))
+                                .thenCompose(children -> {
+                                    CompletableFuture<Void> ret = 
CompletableFuture.completedFuture(null);
+                                    if (children == null || 
children.isEmpty()) {
+                                        String namespace = 
NamespaceName.get(tenant, key).toString();
+                                        // if the length is 0 then this is 
probably a leftover cluster from namespace
+                                        // created with the v1 admin format 
(prop/cluster/ns) and then deleted, so no
+                                        // need to add it to the list
+                                        ret = ret.thenCompose(__ -> 
getAsync(joinPath(BASE_POLICIES_PATH, namespace))
+                                                        .thenAccept(opt -> 
opt.map(k -> namespaces.add(namespace)))
+                                                        .exceptionally(ex -> {
+                                                            Throwable cause = 
FutureUtil.unwrapCompletionException(ex);
+                                                            if (cause 
instanceof MetadataStoreException
+                                                                    
.ContentDeserializationException) {
+                                                                return null;
+                                                            }
+                                                            throw 
FutureUtil.wrapToCompletionException(ex);
+                                                        }));
+                                    } else {
+                                        children.forEach(ns -> {

Review Comment:
   Maybe we can use `Collectors.toList()` to avoid the below code and improve 
readability.
   
   `List<String> namespaces = new ArrayList<>();`



##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/AdminResource.java:
##########
@@ -323,6 +323,11 @@ protected CompletableFuture<Policies> 
getNamespacePoliciesAsync(NamespaceName na
                         return FutureUtil.failedFuture(new RestException(e));
                     }
                     policies.get().bundles = bundleData != null ? bundleData : 
policies.get().bundles;
+                    if (policies.get().is_allow_auto_update_schema == null) {

Review Comment:
   Question:
   
   Why add this part of the code?



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