diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestSnapshotMetrics.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestSnapshotMetrics.java
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+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestSnapshotMetrics.java
@@ -0,0 +1,174 @@
+/**
+ * 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.hdfs.server.namenode.snapshot;
+
+import static org.apache.hadoop.test.MetricsAsserts.assertCounter;
+import static org.apache.hadoop.test.MetricsAsserts.assertGauge;
+import static org.apache.hadoop.test.MetricsAsserts.getMetrics;
+import static org.junit.Assert.assertEquals;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.DistributedFileSystem;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Test the snapshot-related metrics
+ */
+public class TestSnapshotMetrics {
+  
+  private static final long seed = 0;
+  private static final short REPLICATION = 3;
+  private static final String NN_METRICS = "NameNodeActivity";
+  private static final String NS_METRICS = "FSNamesystem";
+  
+  private final Path dir = new Path("/TestSnapshot");
+  private final Path sub1 = new Path(dir, "sub1");
+
+  private final Path file1 = new Path(sub1, "file1");
+  private final Path file2 = new Path(sub1, "file2");
+  
+  private Configuration conf;
+  private MiniDFSCluster cluster;
+  private DistributedFileSystem hdfs;
+
+  @Before
+  public void setUp() throws Exception {
+    conf = new Configuration();
+    cluster = new MiniDFSCluster.Builder(conf)
+      .numDataNodes(REPLICATION)
+      .build();
+    cluster.waitActive();
+    hdfs = cluster.getFileSystem();
+    
+    DFSTestUtil.createFile(hdfs, file1, 1024, REPLICATION, seed);
+    DFSTestUtil.createFile(hdfs, file2, 1024, REPLICATION, seed);
+  }
+
+  @After
+  public void tearDown() throws Exception {
+    if (cluster != null) {
+      cluster.shutdown();
+    }
+  }
+  
+  /**
+   * Test the metric SnapshottableDirectories, AllowSnapshotOps,
+   * DisallowSnapshotOps, and listSnapshottableDirOps
+   */
+  @Test
+  public void testSnapshottableDirs() throws Exception {
+    assertGauge("SnapshottableDirectories", 0L, getMetrics(NS_METRICS));
+    assertCounter("AllowSnapshotOps", 0L, getMetrics(NN_METRICS));
+    assertCounter("DisallowSnapshotOps", 0L, getMetrics(NN_METRICS));
+    
+    // Allow snapshots for directories, and check the metrics
+    hdfs.allowSnapshot(sub1.toString());
+    assertGauge("SnapshottableDirectories", 1L, getMetrics(NS_METRICS));
+    assertCounter("AllowSnapshotOps", 1L, getMetrics(NN_METRICS));
+    
+    Path sub2 = new Path(dir, "sub2");
+    Path file = new Path(sub2, "file");
+    DFSTestUtil.createFile(hdfs, file, 1024, REPLICATION, seed);
+    hdfs.allowSnapshot(sub2.toString());
+    assertGauge("SnapshottableDirectories", 2L, getMetrics(NS_METRICS));
+    assertCounter("AllowSnapshotOps", 2L, getMetrics(NN_METRICS));
+    
+    Path subsub1 = new Path(sub1, "sub1sub1");
+    Path subfile = new Path(subsub1, "file");
+    DFSTestUtil.createFile(hdfs, subfile, 1024, REPLICATION, seed);
+    hdfs.allowSnapshot(subsub1.toString());
+    assertGauge("SnapshottableDirectories", 3L, getMetrics(NS_METRICS));
+    assertCounter("AllowSnapshotOps", 3L, getMetrics(NN_METRICS));
+    
+    // Set an already snapshottable directory to snapshottable, should not
+    // change the metrics
+    hdfs.allowSnapshot(sub1.toString());
+    assertGauge("SnapshottableDirectories", 3L, getMetrics(NS_METRICS));
+    // But the number of allowSnapshot operations still increases
+    assertCounter("AllowSnapshotOps", 4L, getMetrics(NN_METRICS));
+    
+    // Disallow the snapshot for snapshottable directories, then check the
+    // metrics again
+    hdfs.disallowSnapshot(sub1.toString());
+    assertGauge("SnapshottableDirectories", 2L, getMetrics(NS_METRICS));
+    assertCounter("DisallowSnapshotOps", 1L, getMetrics(NN_METRICS));
+    
+    // delete subsub1, snapshottable directories should be 1
+    hdfs.delete(subsub1, true);
+    assertGauge("SnapshottableDirectories", 1L, getMetrics(NS_METRICS));
+    
+    // list all the snapshottable directories
+    SnapshottableDirectoryStatus[] status = hdfs.getSnapshottableDirListing();
+    assertEquals(1, status.length);
+    assertCounter("ListSnapshottableDirOps", 1L, getMetrics(NN_METRICS));
+  }
+  
+  /**
+   * Test the metrics Snapshots, CreateSnapshotOps, DeleteSnapshotOps,
+   * RenameSnapshotOps
+   */
+  @Test
+  public void testSnapshots() throws Exception {
+    assertGauge("Snapshots", 0L, getMetrics(NS_METRICS));
+    assertCounter("CreateSnapshotOps", 0L, getMetrics(NN_METRICS));
+    
+    // Create a snapshot for a non-snapshottable directory, thus should not
+    // change the metrics
+    try {
+      hdfs.createSnapshot(sub1, "s1");
+    } catch (Exception e) {}
+    assertGauge("Snapshots", 0L, getMetrics(NS_METRICS));
+    assertCounter("CreateSnapshotOps", 1L, getMetrics(NN_METRICS));
+    
+    // Create snapshot for sub1
+    hdfs.allowSnapshot(sub1.toString());
+    hdfs.createSnapshot(sub1, "s1");
+    assertGauge("Snapshots", 1L, getMetrics(NS_METRICS));
+    assertCounter("CreateSnapshotOps", 2L, getMetrics(NN_METRICS));
+    hdfs.createSnapshot(sub1, "s2");
+    assertGauge("Snapshots", 2L, getMetrics(NS_METRICS));
+    assertCounter("CreateSnapshotOps", 3L, getMetrics(NN_METRICS));
+    hdfs.getSnapshotDiffReport(sub1, "s1", "s2");
+    assertCounter("SnapshotDiffReportOps", 1L, getMetrics(NN_METRICS));
+    
+    // Create snapshot for a directory under sub1
+    Path subsub1 = new Path(sub1, "sub1sub1");
+    Path subfile = new Path(subsub1, "file");
+    DFSTestUtil.createFile(hdfs, subfile, 1024, REPLICATION, seed);
+    hdfs.allowSnapshot(subsub1.toString());
+    hdfs.createSnapshot(subsub1, "s11");
+    assertGauge("Snapshots", 3L, getMetrics(NS_METRICS));
+    assertCounter("CreateSnapshotOps", 4L, getMetrics(NN_METRICS));
+    
+    // delete snapshot
+    hdfs.deleteSnapshot(sub1, "s2");
+    assertGauge("Snapshots", 2L, getMetrics(NS_METRICS));
+    assertCounter("DeleteSnapshotOps", 1L, getMetrics(NN_METRICS));
+    
+    // rename snapshot
+    hdfs.renameSnapshot(sub1, "s1", "NewS1");
+    assertGauge("Snapshots", 2L, getMetrics(NS_METRICS));
+    assertCounter("RenameSnapshotOps", 1L, getMetrics(NN_METRICS));
+  }
+}
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