AnonHxy commented on code in PR #21595:
URL: https://github.com/apache/pulsar/pull/21595#discussion_r1399947803


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/delayed/BucketDelayedDeliveryTrackerFactory.java:
##########
@@ -35,6 +37,7 @@
 import 
org.apache.pulsar.broker.service.persistent.PersistentDispatcherMultipleConsumers;
 import org.apache.pulsar.common.util.FutureUtil;
 
+@Slf4j

Review Comment:
   Not necessary change.



##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/delayed/BucketDelayedDeliveryTrackerFactory.java:
##########
@@ -85,6 +88,9 @@ public DelayedDeliveryTracker 
newTracker(PersistentDispatcherMultipleConsumers d
      */
     public CompletableFuture<Void> cleanResidualSnapshots(ManagedCursor 
cursor) {
         Map<String, String> cursorProperties = cursor.getCursorProperties();
+        if (MapUtils.isEmpty(cursorProperties)) {

Review Comment:
   I wonder which place introduce the `null` cursorProperties. And if so, 
should all the place check `cursorProperties` is empty or not:)?



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