diff --git a/hbase-common/src/main/java/org/apache/hadoop/hbase/util/CollectionUtils.java b/hbase-common/src/main/java/org/apache/hadoop/hbase/util/CollectionUtils.java
deleted file mode 100644
index 4ba3940126d..00000000000
--- a/hbase-common/src/main/java/org/apache/hadoop/hbase/util/CollectionUtils.java
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.hadoop.hbase.util;
-
-import org.apache.yetus.audience.InterfaceAudience;
-
-/**
- * Utility methods for dealing with Collections, including treating null collections as empty.
- * @deprecated Since 2.0.6/2.1.3/2.2.0
- */
-@InterfaceAudience.Private
-//HBASE-20215: Marking as deprecated. Although audience is private, there might be references to
-//this class on some client classpath.
-@Deprecated
-public class CollectionUtils extends ConcurrentMapUtils {
-
-}
diff --git a/hbase-metrics/src/main/java/org/apache/hadoop/hbase/metrics/impl/MetricRegistryImpl.java b/hbase-metrics/src/main/java/org/apache/hadoop/hbase/metrics/impl/MetricRegistryImpl.java
index 03c669fee0e..05e096304cf 100644
--- a/hbase-metrics/src/main/java/org/apache/hadoop/hbase/metrics/impl/MetricRegistryImpl.java
+++ b/hbase-metrics/src/main/java/org/apache/hadoop/hbase/metrics/impl/MetricRegistryImpl.java
@@ -31,7 +31,7 @@ import org.apache.hadoop.hbase.metrics.MetricRegistry;
 import org.apache.hadoop.hbase.metrics.MetricRegistryInfo;
 import org.apache.hadoop.hbase.metrics.MetricSet;
 import org.apache.hadoop.hbase.metrics.Timer;
-import org.apache.hadoop.hbase.util.CollectionUtils;
+import org.apache.hadoop.hbase.util.ConcurrentMapUtils;
 import org.apache.yetus.audience.InterfaceAudience;
 
 /**
@@ -51,7 +51,7 @@ public class MetricRegistryImpl implements MetricRegistry {
 
   @Override
   public Timer timer(String name) {
-    return (Timer) CollectionUtils.computeIfAbsent(metrics, name, this::createTimer);
+    return (Timer) ConcurrentMapUtils.computeIfAbsent(metrics, name, this::createTimer);
   }
 
   protected Timer createTimer() {
@@ -60,7 +60,7 @@ public class MetricRegistryImpl implements MetricRegistry {
 
   @Override
   public Histogram histogram(String name) {
-    return (Histogram) CollectionUtils.computeIfAbsent(metrics, name, this::createHistogram);
+    return (Histogram) ConcurrentMapUtils.computeIfAbsent(metrics, name, this::createHistogram);
   }
 
   protected Histogram createHistogram() {
@@ -69,7 +69,7 @@ public class MetricRegistryImpl implements MetricRegistry {
 
   @Override
   public Meter meter(String name) {
-    return (Meter) CollectionUtils.computeIfAbsent(metrics, name, this::createMeter);
+    return (Meter) ConcurrentMapUtils.computeIfAbsent(metrics, name, this::createMeter);
   }
 
   protected Meter createMeter() {
@@ -78,7 +78,7 @@ public class MetricRegistryImpl implements MetricRegistry {
 
   @Override
   public Counter counter(String name) {
-    return (Counter) CollectionUtils.computeIfAbsent(metrics, name, this::createCounter);
+    return (Counter) ConcurrentMapUtils.computeIfAbsent(metrics, name, this::createCounter);
   }
 
   protected Counter createCounter() {
@@ -92,7 +92,7 @@ public class MetricRegistryImpl implements MetricRegistry {
 
   @Override
   public Metric register(String name, Metric metric) {
-    return CollectionUtils.computeIfAbsent(metrics, name, () -> metric);
+    return ConcurrentMapUtils.computeIfAbsent(metrics, name, () -> metric);
   }
 
   @Override