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From zg...@apache.org
Subject hbase git commit: HBASE-17864: Implement async snapshot/cloneSnapshot/restoreSnapshot methods
Date Fri, 21 Apr 2017 10:56:46 GMT
Repository: hbase
Updated Branches:
  refs/heads/master 33dadc1a9 -> d39f40e78


HBASE-17864: Implement async snapshot/cloneSnapshot/restoreSnapshot methods

Signed-off-by: Guanghao Zhang <zghao@apache.org>


Project: http://git-wip-us.apache.org/repos/asf/hbase/repo
Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/d39f40e7
Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/d39f40e7
Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/d39f40e7

Branch: refs/heads/master
Commit: d39f40e787ecab54ee597ac4463bbbd2f5e944d9
Parents: 33dadc1
Author: huzheng <openinx@gmail.com>
Authored: Thu Apr 20 18:59:43 2017 +0800
Committer: Guanghao Zhang <zghao@apache.org>
Committed: Fri Apr 21 18:57:43 2017 +0800

----------------------------------------------------------------------
 .../apache/hadoop/hbase/client/AsyncAdmin.java  |  88 +++++++++++
 .../hadoop/hbase/client/AsyncHBaseAdmin.java    | 145 +++++++++++++++++++
 .../apache/hadoop/hbase/client/HBaseAdmin.java  |   3 +-
 .../org/apache/hadoop/hbase/HConstants.java     |   4 +
 .../hbase/client/TestAsyncSnapshotAdminApi.java | 112 ++++++++++++++
 5 files changed, 351 insertions(+), 1 deletion(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hbase/blob/d39f40e7/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdmin.java
----------------------------------------------------------------------
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdmin.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdmin.java
index 5d2955f..b7c60dd 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdmin.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdmin.java
@@ -573,4 +573,92 @@ public interface AsyncAdmin {
    *         {@link CompletableFuture}.
    */
   CompletableFuture<List<TableCFs>> listReplicatedTableCFs();
+
+  /**
+   * Take a snapshot for the given table. If the table is enabled, a FLUSH-type snapshot
will be
+   * taken. If the table is disabled, an offline snapshot is taken. Snapshots are considered
unique
+   * based on <b>the name of the snapshot</b>. Attempts to take a snapshot with
the same name (even
+   * a different type or with different parameters) will fail with a
+   * {@link org.apache.hadoop.hbase.snapshot.SnapshotCreationException} indicating the duplicate
+   * naming. Snapshot names follow the same naming constraints as tables in HBase. See
+   * {@link org.apache.hadoop.hbase.TableName#isLegalFullyQualifiedTableName(byte[])}.
+   * @param snapshotName name of the snapshot to be created
+   * @param tableName name of the table for which snapshot is created
+   */
+  CompletableFuture<Void> snapshot(String snapshotName, TableName tableName);
+
+  /**
+   * Create typed snapshot of the table. Snapshots are considered unique based on <b>the
name of the
+   * snapshot</b>. Attempts to take a snapshot with the same name (even a different
type or with
+   * different parameters) will fail with a
+   * {@link org.apache.hadoop.hbase.snapshot.SnapshotCreationException} indicating the duplicate
+   * naming. Snapshot names follow the same naming constraints as tables in HBase. See
+   * {@link org.apache.hadoop.hbase.TableName#isLegalFullyQualifiedTableName(byte[])}.
+   * @param snapshotName name to give the snapshot on the filesystem. Must be unique from
all other
+   *          snapshots stored on the cluster
+   * @param tableName name of the table to snapshot
+   * @param type type of snapshot to take
+   */
+  CompletableFuture<Void> snapshot(final String snapshotName, final TableName tableName,
+      SnapshotType type);
+
+  /**
+   * Take a snapshot and wait for the server to complete that snapshot asynchronously. Only
a single
+   * snapshot should be taken at a time for an instance of HBase, or results may be undefined
(you
+   * can tell multiple HBase clusters to snapshot at the same time, but only one at a time
for a
+   * single cluster). Snapshots are considered unique based on <b>the name of the snapshot</b>.
+   * Attempts to take a snapshot with the same name (even a different type or with different
+   * parameters) will fail with a {@link org.apache.hadoop.hbase.snapshot.SnapshotCreationException}
+   * indicating the duplicate naming. Snapshot names follow the same naming constraints as
tables in
+   * HBase. See {@link org.apache.hadoop.hbase.TableName#isLegalFullyQualifiedTableName(byte[])}.
+   * You should probably use {@link #snapshot(String, org.apache.hadoop.hbase.TableName)}
unless you
+   * are sure about the type of snapshot that you want to take.
+   * @param snapshot snapshot to take
+   */
+  CompletableFuture<Void> snapshot(SnapshotDescription snapshot);
+
+  /**
+   * Check the current state of the passed snapshot. There are three possible states:
+   * <ol>
+   * <li>running - returns <tt>false</tt></li>
+   * <li>finished - returns <tt>true</tt></li>
+   * <li>finished with error - throws the exception that caused the snapshot to fail</li>
+   * </ol>
+   * The cluster only knows about the most recent snapshot. Therefore, if another snapshot
has been
+   * run/started since the snapshot your are checking, you will recieve an
+   * {@link org.apache.hadoop.hbase.snapshot.UnknownSnapshotException}.
+   * @param snapshot description of the snapshot to check
+   * @return <tt>true</tt> if the snapshot is completed, <tt>false</tt>
if the snapshot is still
+   *         running
+   */
+  CompletableFuture<Boolean> isSnapshotFinished(final SnapshotDescription snapshot);
+
+  /**
+   * Restore the specified snapshot on the original table. (The table must be disabled) If
the
+   * "hbase.snapshot.restore.take.failsafe.snapshot" configuration property is set to true,
a
+   * snapshot of the current table is taken before executing the restore operation. In case
of
+   * restore failure, the failsafe snapshot will be restored. If the restore completes without
+   * problem the failsafe snapshot is deleted.
+   * @param snapshotName name of the snapshot to restore
+   */
+  CompletableFuture<Void> restoreSnapshot(String snapshotName);
+
+  /**
+   * Restore the specified snapshot on the original table. (The table must be disabled) If
+   * 'takeFailSafeSnapshot' is set to true, a snapshot of the current table is taken before
+   * executing the restore operation. In case of restore failure, the failsafe snapshot will
be
+   * restored. If the restore completes without problem the failsafe snapshot is deleted.
The
+   * failsafe snapshot name is configurable by using the property
+   * "hbase.snapshot.restore.failsafe.name".
+   * @param snapshotName name of the snapshot to restore
+   * @param takeFailSafeSnapshot true if the failsafe snapshot should be taken
+   */
+  CompletableFuture<Void> restoreSnapshot(String snapshotName, boolean takeFailSafeSnapshot);
+
+  /**
+   * Create a new table by cloning the snapshot content.
+   * @param snapshotName name of the snapshot to be cloned
+   * @param tableName name of the table where the snapshot will be restored
+   */
+  CompletableFuture<Void> cloneSnapshot(final String snapshotName, final TableName
tableName);
 }

http://git-wip-us.apache.org/repos/asf/hbase/blob/d39f40e7/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncHBaseAdmin.java
----------------------------------------------------------------------
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncHBaseAdmin.java
b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncHBaseAdmin.java
index eae4089..54e1e8b 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncHBaseAdmin.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncHBaseAdmin.java
@@ -37,6 +37,8 @@ import java.util.stream.Collectors;
 
 import com.google.common.annotations.VisibleForTesting;
 
+import io.netty.util.Timeout;
+import io.netty.util.TimerTask;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.hbase.HColumnDescriptor;
@@ -50,6 +52,7 @@ import org.apache.hadoop.hbase.RegionLocations;
 import org.apache.hadoop.hbase.ServerName;
 import org.apache.hadoop.hbase.NamespaceDescriptor;
 import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.TableExistsException;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.AsyncMetaTableAccessor;
 import org.apache.hadoop.hbase.TableNotFoundException;
@@ -77,6 +80,7 @@ import org.apache.hadoop.hbase.shaded.protobuf.generated.AdminProtos.CloseRegion
 import org.apache.hadoop.hbase.shaded.protobuf.generated.AdminProtos.CloseRegionResponse;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.AdminProtos.SplitRegionRequest;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.AdminProtos.SplitRegionResponse;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableSchema;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.AddColumnRequest;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.AddColumnResponse;
@@ -110,6 +114,8 @@ import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DeleteTabl
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DeleteTableResponse;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.IsBalancerEnabledRequest;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.IsBalancerEnabledResponse;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.IsSnapshotDoneRequest;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.IsSnapshotDoneResponse;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.ListNamespaceDescriptorsRequest;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.ListNamespaceDescriptorsResponse;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MasterService;
@@ -123,10 +129,14 @@ import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MoveRegion
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MoveRegionResponse;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.OfflineRegionRequest;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.OfflineRegionResponse;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.RestoreSnapshotRequest;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.RestoreSnapshotResponse;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.SetBalancerRunningRequest;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.SetBalancerRunningResponse;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.SetQuotaRequest;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.SetQuotaResponse;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.SnapshotRequest;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.SnapshotResponse;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.TruncateTableRequest;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.TruncateTableResponse;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.UnassignRegionRequest;
@@ -145,7 +155,10 @@ import org.apache.hadoop.hbase.shaded.protobuf.generated.ReplicationProtos.Remov
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ReplicationProtos.RemoveReplicationPeerResponse;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ReplicationProtos.UpdateReplicationPeerConfigRequest;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ReplicationProtos.UpdateReplicationPeerConfigResponse;
+import org.apache.hadoop.hbase.snapshot.ClientSnapshotDescriptionUtils;
+import org.apache.hadoop.hbase.snapshot.SnapshotCreationException;
 import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
 import org.apache.hadoop.hbase.util.ForeignExceptionUtil;
 import org.apache.hadoop.hbase.util.Pair;
 
@@ -1387,6 +1400,138 @@ public class AsyncHBaseAdmin implements AsyncAdmin {
     return future;
   }
 
+  @Override
+  public CompletableFuture<Void> snapshot(String snapshotName, TableName tableName)
{
+    return snapshot(snapshotName, tableName, SnapshotType.FLUSH);
+  }
+
+  @Override
+  public CompletableFuture<Void> snapshot(String snapshotName, TableName tableName,
+      SnapshotType type) {
+    return snapshot(new SnapshotDescription(snapshotName, tableName, type));
+  }
+
+  @Override
+  public CompletableFuture<Void> snapshot(SnapshotDescription snapshotDesc) {
+    HBaseProtos.SnapshotDescription snapshot =
+        ProtobufUtil.createHBaseProtosSnapshotDesc(snapshotDesc);
+    try {
+      ClientSnapshotDescriptionUtils.assertSnapshotRequestIsValid(snapshot);
+    } catch (IllegalArgumentException e) {
+      return failedFuture(e);
+    }
+    CompletableFuture<Void> future = new CompletableFuture<>();
+    final SnapshotRequest request = SnapshotRequest.newBuilder().setSnapshot(snapshot).build();
+    this.<Long> newMasterCaller()
+        .action((controller, stub) -> this.<SnapshotRequest, SnapshotResponse, Long>
call(
+          controller, stub, request, (s, c, req, done) -> s.snapshot(c, req, done),
+          resp -> resp.getExpectedTimeout()))
+        .call().whenComplete((expectedTimeout, err) -> {
+          if (err != null) {
+            future.completeExceptionally(err);
+            return;
+          }
+          TimerTask pollingTask = new TimerTask() {
+            int tries = 0;
+            long startTime = EnvironmentEdgeManager.currentTime();
+            long endTime = startTime + expectedTimeout;
+            long maxPauseTime = expectedTimeout / maxAttempts;
+
+            @Override
+            public void run(Timeout timeout) throws Exception {
+              if (EnvironmentEdgeManager.currentTime() < endTime) {
+                isSnapshotFinished(snapshotDesc).whenComplete((done, err) -> {
+                  if (err != null) {
+                    future.completeExceptionally(err);
+                  } else if (done) {
+                    future.complete(null);
+                  } else {
+                    // retry again after pauseTime.
+                    long pauseTime = ConnectionUtils
+                        .getPauseTime(TimeUnit.NANOSECONDS.toMillis(pauseNs), ++tries);
+                    pauseTime = Math.min(pauseTime, maxPauseTime);
+                    AsyncConnectionImpl.RETRY_TIMER.newTimeout(this, pauseTime,
+                      TimeUnit.MILLISECONDS);
+                  }
+                });
+              } else {
+                future.completeExceptionally(new SnapshotCreationException(
+                    "Snapshot '" + snapshot.getName() + "' wasn't completed in expectedTime:"
+                        + expectedTimeout + " ms",
+                    snapshotDesc));
+              }
+            }
+          };
+          AsyncConnectionImpl.RETRY_TIMER.newTimeout(pollingTask, 1, TimeUnit.MILLISECONDS);
+        });
+    return future;
+  }
+
+  @Override
+  public CompletableFuture<Boolean> isSnapshotFinished(SnapshotDescription snapshot)
{
+    return this.<Boolean> newMasterCaller()
+        .action((controller, stub) -> this
+            .<IsSnapshotDoneRequest, IsSnapshotDoneResponse, Boolean> call(controller,
stub,
+              IsSnapshotDoneRequest.newBuilder()
+                  .setSnapshot(ProtobufUtil.createHBaseProtosSnapshotDesc(snapshot)).build(),
+              (s, c, req, done) -> s.isSnapshotDone(c, req, done), resp -> resp.getDone()))
+        .call();
+  }
+
+  @Override
+  public CompletableFuture<Void> restoreSnapshot(String snapshotName) {
+    boolean takeFailSafeSnapshot = this.connection.getConfiguration().getBoolean(
+      HConstants.SNAPSHOT_RESTORE_TAKE_FAILSAFE_SNAPSHOT,
+      HConstants.DEFAULT_SNAPSHOT_RESTORE_TAKE_FAILSAFE_SNAPSHOT);
+    return restoreSnapshot(snapshotName, takeFailSafeSnapshot);
+  }
+
+  @Override
+  public CompletableFuture<Void> restoreSnapshot(String snapshotName,
+      boolean takeFailSafeSnapshot) {
+    // TODO It depend on listSnapshots() method.
+    return failedFuture(new UnsupportedOperationException("restoreSnapshot do not supported
yet"));
+  }
+
+  @Override
+  public CompletableFuture<Void> cloneSnapshot(String snapshotName, TableName tableName)
{
+    CompletableFuture<Void> future = new CompletableFuture<>();
+    tableExists(tableName).whenComplete((exists, err) -> {
+      if (err != null) {
+        future.completeExceptionally(err);
+      } else if (exists) {
+        future.completeExceptionally(new TableExistsException(tableName));
+      } else {
+        internalRestoreSnapshot(snapshotName, tableName).whenComplete((ret, err2) -> {
+          if (err2 != null) {
+            future.completeExceptionally(err2);
+          } else {
+            future.complete(ret);
+          }
+        });
+      }
+    });
+    return future;
+  }
+
+  private CompletableFuture<Void> internalRestoreSnapshot(String snapshotName,
+      TableName tableName) {
+    HBaseProtos.SnapshotDescription snapshot = HBaseProtos.SnapshotDescription.newBuilder()
+        .setName(snapshotName).setTable(tableName.getNameAsString()).build();
+    try {
+      ClientSnapshotDescriptionUtils.assertSnapshotRequestIsValid(snapshot);
+    } catch (IllegalArgumentException e) {
+      return failedFuture(e);
+    }
+    return this.<Void> newMasterCaller()
+        .action((controller, stub) -> this
+            .<RestoreSnapshotRequest, RestoreSnapshotResponse, Void> call(controller,
stub,
+              RestoreSnapshotRequest.newBuilder().setSnapshot(snapshot)
+                  .setNonceGroup(ng.getNonceGroup()).setNonce(ng.newNonce()).build(),
+              (s, c, req, done) -> s.restoreSnapshot(c, req, done), resp -> null))
+        .call();
+  }
+
   private byte[][] getSplitKeys(byte[] startKey, byte[] endKey, int numRegions) {
     if (numRegions < 3) {
       throw new IllegalArgumentException("Must create at least three regions");

http://git-wip-us.apache.org/repos/asf/hbase/blob/d39f40e7/hbase-client/src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
----------------------------------------------------------------------
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
index 8063070..e55a95d 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
@@ -2498,7 +2498,8 @@ public class HBaseAdmin implements Admin {
   public void restoreSnapshot(final String snapshotName)
       throws IOException, RestoreSnapshotException {
     boolean takeFailSafeSnapshot =
-      conf.getBoolean("hbase.snapshot.restore.take.failsafe.snapshot", false);
+        conf.getBoolean(HConstants.SNAPSHOT_RESTORE_TAKE_FAILSAFE_SNAPSHOT,
+          HConstants.DEFAULT_SNAPSHOT_RESTORE_TAKE_FAILSAFE_SNAPSHOT);
     restoreSnapshot(snapshotName, takeFailSafeSnapshot);
   }
 

http://git-wip-us.apache.org/repos/asf/hbase/blob/d39f40e7/hbase-common/src/main/java/org/apache/hadoop/hbase/HConstants.java
----------------------------------------------------------------------
diff --git a/hbase-common/src/main/java/org/apache/hadoop/hbase/HConstants.java b/hbase-common/src/main/java/org/apache/hadoop/hbase/HConstants.java
index eff5690..c0dbfe4 100644
--- a/hbase-common/src/main/java/org/apache/hadoop/hbase/HConstants.java
+++ b/hbase-common/src/main/java/org/apache/hadoop/hbase/HConstants.java
@@ -1351,6 +1351,10 @@ public final class HConstants {
   public static final String DEFAULT_TEMPORARY_HDFS_DIRECTORY = "/user/"
       + System.getProperty("user.name") + "/hbase-staging";
 
+  public static final String SNAPSHOT_RESTORE_TAKE_FAILSAFE_SNAPSHOT =
+      "hbase.snapshot.restore.take.failsafe.snapshot";
+  public static final boolean DEFAULT_SNAPSHOT_RESTORE_TAKE_FAILSAFE_SNAPSHOT = false;
+
   private HConstants() {
     // Can't be instantiated with this ctor.
   }

http://git-wip-us.apache.org/repos/asf/hbase/blob/d39f40e7/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncSnapshotAdminApi.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncSnapshotAdminApi.java
b/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncSnapshotAdminApi.java
new file mode 100644
index 0000000..0eb3881
--- /dev/null
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncSnapshotAdminApi.java
@@ -0,0 +1,112 @@
+/**
+ * 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.client;
+
+import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.testclassification.ClientTests;
+import org.apache.hadoop.hbase.testclassification.MediumTests;
+import org.apache.hadoop.hbase.util.Bytes;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import java.util.Collections;
+import java.util.List;
+
+@Category({ MediumTests.class, ClientTests.class })
+public class TestAsyncSnapshotAdminApi extends TestAsyncAdminBase {
+
+  @Test
+  public void testTakeSnapshot() throws Exception {
+    String snapshotName1 = "snapshotName1";
+    String snapshotName2 = "snapshotName2";
+    TableName tableName = TableName.valueOf("testTakeSnapshot");
+    Admin syncAdmin = TEST_UTIL.getAdmin();
+
+    try {
+      Table table = TEST_UTIL.createTable(tableName, Bytes.toBytes("f1"));
+      for (int i = 0; i < 3000; i++) {
+        table.put(new Put(Bytes.toBytes(i)).addColumn(Bytes.toBytes("f1"), Bytes.toBytes("cq"),
+          Bytes.toBytes(i)));
+      }
+
+      admin.snapshot(snapshotName1, tableName).get();
+      admin.snapshot(snapshotName2, tableName).get();
+      List<SnapshotDescription> snapshots = syncAdmin.listSnapshots();
+      Collections.sort(snapshots, (snap1, snap2) -> {
+        Assert.assertNotNull(snap1);
+        Assert.assertNotNull(snap1.getName());
+        Assert.assertNotNull(snap2);
+        Assert.assertNotNull(snap2.getName());
+        return snap1.getName().compareTo(snap2.getName());
+      });
+
+      Assert.assertEquals(snapshotName1, snapshots.get(0).getName());
+      Assert.assertEquals(tableName, snapshots.get(0).getTableName());
+      Assert.assertEquals(SnapshotType.FLUSH, snapshots.get(0).getType());
+      Assert.assertEquals(snapshotName2, snapshots.get(1).getName());
+      Assert.assertEquals(tableName, snapshots.get(1).getTableName());
+      Assert.assertEquals(SnapshotType.FLUSH, snapshots.get(1).getType());
+    } finally {
+      syncAdmin.deleteSnapshot(snapshotName1);
+      syncAdmin.deleteSnapshot(snapshotName2);
+      TEST_UTIL.deleteTable(tableName);
+    }
+  }
+
+  @Test
+  public void testCloneSnapshot() throws Exception {
+    String snapshotName1 = "snapshotName1";
+    TableName tableName = TableName.valueOf("testCloneSnapshot");
+    TableName tableName2 = TableName.valueOf("testCloneSnapshot2");
+    Admin syncAdmin = TEST_UTIL.getAdmin();
+
+    try {
+      Table table = TEST_UTIL.createTable(tableName, Bytes.toBytes("f1"));
+      for (int i = 0; i < 3000; i++) {
+        table.put(new Put(Bytes.toBytes(i)).addColumn(Bytes.toBytes("f1"), Bytes.toBytes("cq"),
+          Bytes.toBytes(i)));
+      }
+
+      admin.snapshot(snapshotName1, tableName).get();
+      List<SnapshotDescription> snapshots = syncAdmin.listSnapshots();
+      Assert.assertEquals(snapshots.size(), 1);
+      Assert.assertEquals(snapshotName1, snapshots.get(0).getName());
+      Assert.assertEquals(tableName, snapshots.get(0).getTableName());
+      Assert.assertEquals(SnapshotType.FLUSH, snapshots.get(0).getType());
+
+      // cloneSnapshot into a existed table.
+      boolean failed = false;
+      try {
+        admin.cloneSnapshot(snapshotName1, tableName).get();
+      } catch (Exception e) {
+        failed = true;
+      }
+      Assert.assertTrue(failed);
+
+      // cloneSnapshot into a new table.
+      Assert.assertTrue(!syncAdmin.tableExists(tableName2));
+      admin.cloneSnapshot(snapshotName1, tableName2).get();
+      syncAdmin.tableExists(tableName2);
+    } finally {
+      syncAdmin.deleteSnapshot(snapshotName1);
+      TEST_UTIL.deleteTable(tableName);
+    }
+  }
+}
\ No newline at end of file


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