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 aaeb0df74c353..da7083beefda9 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
@@ -1160,7 +1160,7 @@ public class ServiceConfiguration implements PulsarConfiguration {
             + " It's shared across all the topics running in the same broker.\n\n"
             + " Use -1 to disable the memory limitation. Default is 1/2 of direct memory.\n\n")
     private int maxMessagePublishBufferSizeInMB = Math.max(64,
-        (int) (io.netty.util.internal.PlatformDependent.maxDirectMemory() / 2 / (1024 * 1024)));
+        (int) (io.netty.util.internal.PlatformDependent.estimateMaxDirectMemory() / 2 / (1024 * 1024)));
 
     @FieldContext(
         category = CATEGORY_SERVER,
diff --git a/pulsar-broker/src/main/java/org/apache/pulsar/PulsarBrokerStarter.java b/pulsar-broker/src/main/java/org/apache/pulsar/PulsarBrokerStarter.java
index 431488d8d925d..bc2e2936ee333 100644
--- a/pulsar-broker/src/main/java/org/apache/pulsar/PulsarBrokerStarter.java
+++ b/pulsar-broker/src/main/java/org/apache/pulsar/PulsarBrokerStarter.java
@@ -38,12 +38,15 @@
 import java.util.Arrays;
 import java.util.Date;
 import java.util.Optional;
+
+// CHECKSTYLE.OFF: IllegalImport
+import io.netty.util.internal.PlatformDependent;
+// CHECKSTYLE.ON: IllegalImport
 import org.apache.bookkeeper.common.util.ReflectionUtils;
 import org.apache.bookkeeper.conf.ServerConfiguration;
 import org.apache.bookkeeper.proto.BookieServer;
 import org.apache.bookkeeper.replication.AutoRecoveryMain;
 import org.apache.bookkeeper.stats.StatsProvider;
-import org.apache.bookkeeper.util.DirectMemoryUtils;
 import org.apache.commons.configuration.ConfigurationException;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.core.util.datetime.FixedDateFormat;
@@ -169,7 +172,7 @@ private static class BrokerStarter {
             }
 
             int maxFrameSize = brokerConfig.getMaxMessageSize() + Commands.MESSAGE_SIZE_FRAME_PADDING;
-            if (maxFrameSize >= DirectMemoryUtils.maxDirectMemory()) {
+            if (maxFrameSize >= PlatformDependent.estimateMaxDirectMemory()) {
                 throw new IllegalArgumentException("Max message size need smaller than jvm directMemory");
             }
 
diff --git a/pulsar-broker/src/main/java/org/apache/pulsar/broker/loadbalance/impl/LoadManagerShared.java b/pulsar-broker/src/main/java/org/apache/pulsar/broker/loadbalance/impl/LoadManagerShared.java
index 7423485d7e176..32f5f837d5e59 100644
--- a/pulsar-broker/src/main/java/org/apache/pulsar/broker/loadbalance/impl/LoadManagerShared.java
+++ b/pulsar-broker/src/main/java/org/apache/pulsar/broker/loadbalance/impl/LoadManagerShared.java
@@ -225,7 +225,7 @@ public static SystemResourceUsage getSystemResourceUsage(final BrokerHostUsage b
 
         // Collect JVM direct memory
         systemResourceUsage.setDirectMemory(new ResourceUsage((double) (getJvmDirectMemoryUsed() / MIBI),
-                (double) (io.netty.util.internal.PlatformDependent.maxDirectMemory() / MIBI)));
+                (double) (io.netty.util.internal.PlatformDependent.estimateMaxDirectMemory() / MIBI)));
 
         return systemResourceUsage;
     }
diff --git a/pulsar-broker/src/main/java/org/apache/pulsar/broker/stats/prometheus/PrometheusMetricsGenerator.java b/pulsar-broker/src/main/java/org/apache/pulsar/broker/stats/prometheus/PrometheusMetricsGenerator.java
index bf2884e2b3a1a..5781331277ced 100644
--- a/pulsar-broker/src/main/java/org/apache/pulsar/broker/stats/prometheus/PrometheusMetricsGenerator.java
+++ b/pulsar-broker/src/main/java/org/apache/pulsar/broker/stats/prometheus/PrometheusMetricsGenerator.java
@@ -70,7 +70,7 @@ public double get() {
         Gauge.build("jvm_memory_direct_bytes_max", "-").create().setChild(new Child() {
             @Override
             public double get() {
-                return io.netty.util.internal.PlatformDependent.maxDirectMemory();
+                return io.netty.util.internal.PlatformDependent.estimateMaxDirectMemory();
             }
         }).register(CollectorRegistry.defaultRegistry);
 
diff --git a/pulsar-common/src/main/java/org/apache/pulsar/common/stats/JvmMetrics.java b/pulsar-common/src/main/java/org/apache/pulsar/common/stats/JvmMetrics.java
index d05484062d1a2..28f37bfb590a9 100644
--- a/pulsar-common/src/main/java/org/apache/pulsar/common/stats/JvmMetrics.java
+++ b/pulsar-common/src/main/java/org/apache/pulsar/common/stats/JvmMetrics.java
@@ -103,7 +103,7 @@ public List<Metrics> generate() {
         m.put("jvm_total_memory", r.totalMemory());
 
         m.put("jvm_direct_memory_used", getJvmDirectMemoryUsed());
-        m.put("jvm_max_direct_memory", io.netty.util.internal.PlatformDependent.maxDirectMemory());
+        m.put("jvm_max_direct_memory", io.netty.util.internal.PlatformDependent.estimateMaxDirectMemory());
         m.put("jvm_thread_cnt", getThreadCount());
 
         this.gcLogger.logMetrics(m);
diff --git a/pulsar-functions/runtime/src/main/java/org/apache/pulsar/functions/runtime/thread/ThreadRuntimeFactory.java b/pulsar-functions/runtime/src/main/java/org/apache/pulsar/functions/runtime/thread/ThreadRuntimeFactory.java
index e57af3279af57..e7f3f5800e801 100644
--- a/pulsar-functions/runtime/src/main/java/org/apache/pulsar/functions/runtime/thread/ThreadRuntimeFactory.java
+++ b/pulsar-functions/runtime/src/main/java/org/apache/pulsar/functions/runtime/thread/ThreadRuntimeFactory.java
@@ -145,7 +145,7 @@ private Optional<Long> calculateClientMemoryLimit(Optional<ThreadRuntimeFactoryC
     }
 
     private long getBytesPercentDirectMem(double percent) {
-        return (long) (io.netty.util.internal.PlatformDependent.maxDirectMemory() * (percent / 100));
+        return (long) (io.netty.util.internal.PlatformDependent.estimateMaxDirectMemory() * (percent / 100));
     }
 
 
diff --git a/pulsar-functions/worker/src/main/java/org/apache/pulsar/functions/worker/WorkerStatsManager.java b/pulsar-functions/worker/src/main/java/org/apache/pulsar/functions/worker/WorkerStatsManager.java
index e2e0781d8d308..daac6b8c674aa 100644
--- a/pulsar-functions/worker/src/main/java/org/apache/pulsar/functions/worker/WorkerStatsManager.java
+++ b/pulsar-functions/worker/src/main/java/org/apache/pulsar/functions/worker/WorkerStatsManager.java
@@ -190,7 +190,7 @@ public double get() {
       Gauge.build("jvm_memory_direct_bytes_max", "-").create().setChild(new Gauge.Child() {
         @Override
         public double get() {
-          return io.netty.util.internal.PlatformDependent.maxDirectMemory();
+          return io.netty.util.internal.PlatformDependent.estimateMaxDirectMemory();
         }
       }).register(CollectorRegistry.defaultRegistry);
     }
diff --git a/pulsar-proxy/src/main/java/org/apache/pulsar/proxy/server/ProxyServiceStarter.java b/pulsar-proxy/src/main/java/org/apache/pulsar/proxy/server/ProxyServiceStarter.java
index 9fda513c6e0f5..ba859e8d27798 100644
--- a/pulsar-proxy/src/main/java/org/apache/pulsar/proxy/server/ProxyServiceStarter.java
+++ b/pulsar-proxy/src/main/java/org/apache/pulsar/proxy/server/ProxyServiceStarter.java
@@ -226,7 +226,7 @@ public double get() {
         Gauge.build("jvm_memory_direct_bytes_max", "-").create().setChild(new Child() {
             @Override
             public double get() {
-                return PlatformDependent.maxDirectMemory();
+                return PlatformDependent.estimateMaxDirectMemory();
             }
         }).register(CollectorRegistry.defaultRegistry);
 
diff --git a/pulsar-websocket/src/main/java/org/apache/pulsar/websocket/stats/JvmMetrics.java b/pulsar-websocket/src/main/java/org/apache/pulsar/websocket/stats/JvmMetrics.java
index 91f3db2192f58..1854d40724ec9 100644
--- a/pulsar-websocket/src/main/java/org/apache/pulsar/websocket/stats/JvmMetrics.java
+++ b/pulsar-websocket/src/main/java/org/apache/pulsar/websocket/stats/JvmMetrics.java
@@ -19,7 +19,6 @@
 package org.apache.pulsar.websocket.stats;
 
 // CHECKSTYLE.OFF: IllegalImport
-import static io.netty.util.internal.PlatformDependent.maxDirectMemory;
 import static org.apache.pulsar.common.stats.Metrics.create;
 import static org.apache.pulsar.common.util.Runnables.catchingAndLoggingThrowables;
 import java.lang.management.ManagementFactory;
@@ -29,6 +28,8 @@
 import javax.management.MBeanServer;
 import javax.management.MalformedObjectNameException;
 import javax.management.ObjectName;
+
+import io.netty.util.internal.PlatformDependent;
 import org.apache.pulsar.common.stats.Metrics;
 import org.apache.pulsar.websocket.WebSocketService;
 import org.slf4j.Logger;
@@ -65,7 +66,7 @@ public Metrics generate() {
         m.put("jvm_max_memory", r.maxMemory());
         m.put("jvm_total_memory", r.totalMemory());
 
-        m.put("jvm_max_direct_memory", maxDirectMemory());
+        m.put("jvm_max_direct_memory", PlatformDependent.estimateMaxDirectMemory());
         m.put("jvm_thread_cnt", getThreadCount());
 
         m.put("jvm_gc_young_pause", currentYoungGcTime);