diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableRatesWithAggregation.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableRatesWithAggregation.java
index 4c5f0a844a..60b33a84b5 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableRatesWithAggregation.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableRatesWithAggregation.java
@@ -72,7 +72,7 @@ public void init(Class<?> protocol) {
       return;
     }
     protocolCache.add(protocol);
-    for (Method method : protocol.getDeclaredMethods()) {
+    for (Method method : protocol.getMethods()) {
       String name = method.getName();
       LOG.debug(name);
       addMetricIfNotExists(name);
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/metrics/TestNameNodeMetrics.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/metrics/TestNameNodeMetrics.java
index aaedb8288e..4d472d74b4 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/metrics/TestNameNodeMetrics.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/metrics/TestNameNodeMetrics.java
@@ -48,6 +48,9 @@
 import java.util.EnumSet;
 import java.util.List;
 import java.util.Random;
+
+import org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer;
+import org.apache.hadoop.ipc.metrics.RpcDetailedMetrics;
 import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableList;
 
 import org.slf4j.Logger;
@@ -1128,4 +1131,14 @@ public void testEditLogTailing() throws Exception {
     }
 
   }
+
+  @Test
+  public void testNNRPCMetricIntegrity() {
+    RpcDetailedMetrics metrics =
+        ((NameNodeRpcServer) cluster.getNameNode()
+            .getRpcServer()).getClientRpcServer().getRpcDetailedMetrics();
+    MetricsRecordBuilder rb = getMetrics(metrics.name());
+    // CommitBlockSynchronizationNumOps should exist.
+    assertCounter("CommitBlockSynchronizationNumOps", 0L, rb);
+  }
 }