diff --git a/pulsar-discovery-service/src/main/java/org/apache/pulsar/discovery/service/web/ZookeeperCacheLoader.java b/pulsar-discovery-service/src/main/java/org/apache/pulsar/discovery/service/web/ZookeeperCacheLoader.java
index e1a2cd7927bdc3914a1ceea3dc70bdc0d6f19c99..1a6944a2cc6bfeb561f47df53df19e4e47f8aa46 100644
--- a/pulsar-discovery-service/src/main/java/org/apache/pulsar/discovery/service/web/ZookeeperCacheLoader.java
+++ b/pulsar-discovery-service/src/main/java/org/apache/pulsar/discovery/service/web/ZookeeperCacheLoader.java
@@ -28,6 +28,7 @@ import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.TimeUnit;
 
 import org.apache.bookkeeper.common.util.OrderedScheduler;
+import org.apache.commons.collections4.CollectionUtils;
 import org.apache.pulsar.common.util.FutureUtil;
 import org.apache.pulsar.common.util.ObjectMapperFactory;
 import org.apache.pulsar.policies.data.loadbalancer.LoadManagerReport;
@@ -124,6 +125,13 @@ public class ZookeeperCacheLoader implements Closeable {
     }
 
     public List<LoadManagerReport> getAvailableBrokers() {
+        if (CollectionUtils.isEmpty(availableBrokers)) {
+            try {
+                updateBrokerList(availableBrokersCache.get());
+            } catch (Exception e) {
+                log.warn("Error updating broker from zookeeper.", e);
+            }
+        }
         return availableBrokers;
     }