codelipenghui commented on a change in pull request #13745:
URL: https://github.com/apache/pulsar/pull/13745#discussion_r784115015



##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/PersistentTopicsBase.java
##########
@@ -1137,26 +1137,27 @@ private void resumeAsyncResponse(AsyncResponse 
asyncResponse, Set<String> subscr
     }
 
     private void internalGetSubscriptionsForNonPartitionedTopic(AsyncResponse 
asyncResponse, boolean authoritative) {
-        try {
-            validateTopicOwnership(topicName, authoritative);
-            validateTopicOperation(topicName, 
TopicOperation.GET_SUBSCRIPTIONS);
-
-            Topic topic = getTopicReference(topicName);
-            final List<String> subscriptions = Lists.newArrayList();
-            topic.getSubscriptions().forEach((subName, sub) -> 
subscriptions.add(subName));
-            asyncResponse.resume(subscriptions);
-        } catch (WebApplicationException wae) {
-            if (log.isDebugEnabled()) {
-                log.debug("[{}] Failed to get subscriptions for 
non-partitioned topic {},"
-                                + " redirecting to other brokers.",
-                        clientAppId(), topicName, wae);
-            }
-            resumeAsyncResponseExceptionally(asyncResponse, wae);
-            return;
-        } catch (Exception e) {
-            log.error("[{}] Failed to get list of subscriptions for {}", 
clientAppId(), topicName, e);
-            resumeAsyncResponseExceptionally(asyncResponse, e);
-        }
+        validateTopicOwnershipAsync(topicName, authoritative)
+                .thenRun(() -> validateTopicOperation(topicName, 
TopicOperation.GET_SUBSCRIPTIONS))
+                .thenCompose(__ -> getTopicReferenceAsync(topicName))

Review comment:
       ```suggestion
                   .thenCompose(__ -> {
                       validateTopicOperation(topicName, 
TopicOperation.GET_SUBSCRIPTIONS);
                       return getTopicReferenceAsync(topicName);
                   })
   ```

##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/PersistentTopicsBase.java
##########
@@ -1137,26 +1137,27 @@ private void resumeAsyncResponse(AsyncResponse 
asyncResponse, Set<String> subscr
     }
 
     private void internalGetSubscriptionsForNonPartitionedTopic(AsyncResponse 
asyncResponse, boolean authoritative) {
-        try {
-            validateTopicOwnership(topicName, authoritative);
-            validateTopicOperation(topicName, 
TopicOperation.GET_SUBSCRIPTIONS);
-
-            Topic topic = getTopicReference(topicName);
-            final List<String> subscriptions = Lists.newArrayList();
-            topic.getSubscriptions().forEach((subName, sub) -> 
subscriptions.add(subName));
-            asyncResponse.resume(subscriptions);
-        } catch (WebApplicationException wae) {
-            if (log.isDebugEnabled()) {
-                log.debug("[{}] Failed to get subscriptions for 
non-partitioned topic {},"
-                                + " redirecting to other brokers.",
-                        clientAppId(), topicName, wae);
-            }
-            resumeAsyncResponseExceptionally(asyncResponse, wae);
-            return;
-        } catch (Exception e) {
-            log.error("[{}] Failed to get list of subscriptions for {}", 
clientAppId(), topicName, e);
-            resumeAsyncResponseExceptionally(asyncResponse, e);
-        }
+        validateTopicOwnershipAsync(topicName, authoritative)
+                .thenRun(() -> validateTopicOperation(topicName, 
TopicOperation.GET_SUBSCRIPTIONS))
+                .thenCompose(__ -> getTopicReferenceAsync(topicName))
+                .thenAccept(topic -> {
+                    final List<String> subscriptions = new 
ArrayList<>(topic.getSubscriptions().keys());
+                    asyncResponse.resume(subscriptions);
+                }).exceptionally(ex -> {
+                    Throwable cause = ex.getCause();
+                    if (ex instanceof WebApplicationException) {
+                        if (log.isDebugEnabled() && ((WebApplicationException) 
cause).getResponse().getStatus()
+                                == Status.TEMPORARY_REDIRECT.getStatusCode()) {
+                            log.debug("[{}] Failed to get subscriptions for 
non-partitioned topic {},"
+                                            + " redirecting to other brokers.",
+                                    clientAppId(), topicName, ex);
+                        }
+                    } else {
+                        log.error("[{}] Failed to get list of subscriptions 
for {}", clientAppId(), topicName, ex);
+                    }
+                    resumeAsyncResponseExceptionally(asyncResponse, ex);

Review comment:
       ```suggestion
                       resumeAsyncResponseExceptionally(asyncResponse, cause);
   ```

##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/PersistentTopicsBase.java
##########
@@ -1137,26 +1137,27 @@ private void resumeAsyncResponse(AsyncResponse 
asyncResponse, Set<String> subscr
     }
 
     private void internalGetSubscriptionsForNonPartitionedTopic(AsyncResponse 
asyncResponse, boolean authoritative) {
-        try {
-            validateTopicOwnership(topicName, authoritative);
-            validateTopicOperation(topicName, 
TopicOperation.GET_SUBSCRIPTIONS);
-
-            Topic topic = getTopicReference(topicName);
-            final List<String> subscriptions = Lists.newArrayList();
-            topic.getSubscriptions().forEach((subName, sub) -> 
subscriptions.add(subName));
-            asyncResponse.resume(subscriptions);
-        } catch (WebApplicationException wae) {
-            if (log.isDebugEnabled()) {
-                log.debug("[{}] Failed to get subscriptions for 
non-partitioned topic {},"
-                                + " redirecting to other brokers.",
-                        clientAppId(), topicName, wae);
-            }
-            resumeAsyncResponseExceptionally(asyncResponse, wae);
-            return;
-        } catch (Exception e) {
-            log.error("[{}] Failed to get list of subscriptions for {}", 
clientAppId(), topicName, e);
-            resumeAsyncResponseExceptionally(asyncResponse, e);
-        }
+        validateTopicOwnershipAsync(topicName, authoritative)
+                .thenRun(() -> validateTopicOperation(topicName, 
TopicOperation.GET_SUBSCRIPTIONS))
+                .thenCompose(__ -> getTopicReferenceAsync(topicName))
+                .thenAccept(topic -> {
+                    final List<String> subscriptions = new 
ArrayList<>(topic.getSubscriptions().keys());
+                    asyncResponse.resume(subscriptions);
+                }).exceptionally(ex -> {
+                    Throwable cause = ex.getCause();
+                    if (ex instanceof WebApplicationException) {
+                        if (log.isDebugEnabled() && ((WebApplicationException) 
cause).getResponse().getStatus()
+                                == Status.TEMPORARY_REDIRECT.getStatusCode()) {
+                            log.debug("[{}] Failed to get subscriptions for 
non-partitioned topic {},"
+                                            + " redirecting to other brokers.",
+                                    clientAppId(), topicName, ex);

Review comment:
       ```suggestion
                               log.debug("[{}] Failed to get subscriptions for 
non-partitioned topic {},"
                                               + " redirecting to other 
brokers.",
                                       clientAppId(), topicName, cause);
   ```

##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/PersistentTopicsBase.java
##########
@@ -1137,26 +1137,27 @@ private void resumeAsyncResponse(AsyncResponse 
asyncResponse, Set<String> subscr
     }
 
     private void internalGetSubscriptionsForNonPartitionedTopic(AsyncResponse 
asyncResponse, boolean authoritative) {
-        try {
-            validateTopicOwnership(topicName, authoritative);
-            validateTopicOperation(topicName, 
TopicOperation.GET_SUBSCRIPTIONS);
-
-            Topic topic = getTopicReference(topicName);
-            final List<String> subscriptions = Lists.newArrayList();
-            topic.getSubscriptions().forEach((subName, sub) -> 
subscriptions.add(subName));
-            asyncResponse.resume(subscriptions);
-        } catch (WebApplicationException wae) {
-            if (log.isDebugEnabled()) {
-                log.debug("[{}] Failed to get subscriptions for 
non-partitioned topic {},"
-                                + " redirecting to other brokers.",
-                        clientAppId(), topicName, wae);
-            }
-            resumeAsyncResponseExceptionally(asyncResponse, wae);
-            return;
-        } catch (Exception e) {
-            log.error("[{}] Failed to get list of subscriptions for {}", 
clientAppId(), topicName, e);
-            resumeAsyncResponseExceptionally(asyncResponse, e);
-        }
+        validateTopicOwnershipAsync(topicName, authoritative)
+                .thenRun(() -> validateTopicOperation(topicName, 
TopicOperation.GET_SUBSCRIPTIONS))
+                .thenCompose(__ -> getTopicReferenceAsync(topicName))
+                .thenAccept(topic -> {
+                    final List<String> subscriptions = new 
ArrayList<>(topic.getSubscriptions().keys());
+                    asyncResponse.resume(subscriptions);
+                }).exceptionally(ex -> {
+                    Throwable cause = ex.getCause();
+                    if (ex instanceof WebApplicationException) {
+                        if (log.isDebugEnabled() && ((WebApplicationException) 
cause).getResponse().getStatus()
+                                == Status.TEMPORARY_REDIRECT.getStatusCode()) {
+                            log.debug("[{}] Failed to get subscriptions for 
non-partitioned topic {},"
+                                            + " redirecting to other brokers.",
+                                    clientAppId(), topicName, ex);
+                        }
+                    } else {
+                        log.error("[{}] Failed to get list of subscriptions 
for {}", clientAppId(), topicName, ex);

Review comment:
       ```suggestion
                           log.error("[{}] Failed to get list of subscriptions 
for {}", clientAppId(), topicName, cause);
   ```




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