mattisonchao commented on code in PR #20613:
URL: https://github.com/apache/pulsar/pull/20613#discussion_r1241005632


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/SystemTopicBasedTopicPoliciesService.java:
##########
@@ -362,13 +362,20 @@ private void 
initPolicesCache(SystemTopicClient.Reader<PulsarEvent> reader, Comp
                 policyCacheInitMap.computeIfPresent(
                         
reader.getSystemTopic().getTopicName().getNamespaceObject(), (k, v) -> true);
                 // replay policy message
-                policiesCache.forEach(((topicName, topicPolicies) -> {
-                    if (listeners.get(topicName) != null) {
-                        for (TopicPolicyListener<TopicPolicies> listener : 
listeners.get(topicName)) {
-                            listener.onUpdate(topicPolicies);
+                try {
+                    policiesCache.forEach(((topicName, topicPolicies) -> {
+                        if (listeners.get(topicName) != null) {
+                            for (TopicPolicyListener<TopicPolicies> listener : 
listeners.get(topicName)) {
+                                listener.onUpdate(topicPolicies);
+                            }
                         }
-                    }
-                }));
+                    }));
+                } catch (Throwable e) {
+                    log.error("[{}] Failed to replay policy message.", 
reader.getSystemTopic().getTopicName(), e);
+                    future.completeExceptionally(e);

Review Comment:
   The callback will invoke before `cleanCacheAndCloseReader`, which may cause 
some inconsistent status.  :) 
   
   Considering someone who checks the cache and reader status in the future 
callback.



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