BewareMyPower commented on code in PR #24427:
URL: https://github.com/apache/pulsar/pull/24427#discussion_r2297909292


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/SystemTopicBasedTopicPoliciesService.java:
##########
@@ -107,8 +111,16 @@ protected NamespaceEventsSystemTopicFactory initialize() {
     @VisibleForTesting
     final Map<TopicName, List<TopicPolicyListener>> listeners = new 
ConcurrentHashMap<>();
 
+    private final Map<NamespaceName, TopicPolicyMessageHandlerTracker> 
topicPolicyMessageHandlerTrackers =
+            new ConcurrentHashMap<>();
+
     private final AsyncLoadingCache<NamespaceName, 
SystemTopicClient.Writer<PulsarEvent>> writerCaches;
 
+    // Sequencer for policy updates per topic and per policy type 
(global/local)
+    // Key: Pair<TopicName, Boolean (isGlobal)>, Value: 
CompletableFuture<Void> representing the last update in sequence
+    private final ConcurrentHashMap<Pair<TopicName, Boolean>, 
CompletableFuture<Void>> topicPolicyUpdateSequencer =

Review Comment:
   Ah yes, it's right.



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