diff --git a/pulsar-broker-common/src/main/java/org/apache/pulsar/broker/ServiceConfiguration.java b/pulsar-broker-common/src/main/java/org/apache/pulsar/broker/ServiceConfiguration.java
index 80dfcaf4b0b20..324a4c9a8dc01 100644
--- a/pulsar-broker-common/src/main/java/org/apache/pulsar/broker/ServiceConfiguration.java
+++ b/pulsar-broker-common/src/main/java/org/apache/pulsar/broker/ServiceConfiguration.java
@@ -1453,11 +1453,10 @@ The max allowed delay for delayed delivery (in milliseconds). If the broker rece
             doc = "Enable or disable exposing broker entry metadata to client.")
     private boolean exposingBrokerEntryMetadataToClientEnabled = false;
 
+    @Deprecated
     @FieldContext(
         category = CATEGORY_SERVER,
-        doc = "Enable namespaceIsolation policy update take effect ontime or not,"
-                + " if set to ture, then the related namespaces will be unloaded after reset policy to make it "
-                + "take effect."
+        doc = "This config never takes effect and will be removed in the next release"
     )
     private boolean enableNamespaceIsolationUpdateOnTime = false;
 
diff --git a/pulsar-broker/src/test/java/org/apache/pulsar/broker/admin/AdminApi2Test.java b/pulsar-broker/src/test/java/org/apache/pulsar/broker/admin/AdminApi2Test.java
index 3899338870451..6bc64f4dd65d0 100644
--- a/pulsar-broker/src/test/java/org/apache/pulsar/broker/admin/AdminApi2Test.java
+++ b/pulsar-broker/src/test/java/org/apache/pulsar/broker/admin/AdminApi2Test.java
@@ -199,7 +199,6 @@ protected ServiceConfiguration getDefaultConf() {
     void configureDefaults(ServiceConfiguration conf) {
         conf.setForceDeleteNamespaceAllowed(true);
         conf.setLoadBalancerEnabled(true);
-        conf.setEnableNamespaceIsolationUpdateOnTime(true);
         conf.setAllowOverrideEntryFilters(true);
         conf.setEntryFilterNames(List.of());
         conf.setMaxNumPartitionsPerPartitionedTopic(0);
@@ -1394,6 +1393,7 @@ public void brokerNamespaceIsolationPoliciesUpdateOnTime() throws Exception {
 
         try {
             admin.lookups().lookupTopic(ns1Name + "/topic3");
+            fail();
         } catch (Exception e) {
             // expected lookup fail, because no brokers matched the policy.
             log.info(" 2 expected fail lookup");
@@ -1401,6 +1401,7 @@ public void brokerNamespaceIsolationPoliciesUpdateOnTime() throws Exception {
 
         try {
             admin.lookups().lookupTopic(ns1Name + "/topic1");
+            fail();
         } catch (Exception e) {
             // expected lookup fail, because no brokers matched the policy.
             log.info(" 22 expected fail lookup");