diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/HRegionInfo.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/HRegionInfo.java
index 045f866af14..b98d2106dec 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/HRegionInfo.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/HRegionInfo.java
@@ -43,6 +43,7 @@ import org.apache.hadoop.hbase.util.HashKey;
 import org.apache.hadoop.hbase.util.JenkinsHash;
 import org.apache.hadoop.hbase.util.MD5Hash;
 import org.apache.hadoop.io.DataInputBuffer;
+import org.apache.hadoop.util.StringUtils;
 
 /**
  * Information about a region. A region is a range of keys in the whole keyspace of a table, an
@@ -582,6 +583,19 @@ public class HRegionInfo implements Comparable<HRegionInfo> {
     return elements;
   }
 
+  public static boolean isEncodedRegionName(byte[] regionName) throws IOException {
+    try {
+      HRegionInfo.parseRegionName(regionName);
+      return false;
+    } catch (IOException e) {
+      if (StringUtils.stringifyException(e)
+          .contains(HRegionInfo.INVALID_REGION_NAME_FORMAT_MESSAGE)) {
+        return true;
+      }
+      throw e;
+    }
+  }
+
   /** @return the regionId */
   public long getRegionId(){
     return regionId;
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 630ae47c1d1..5a13edee5a7 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
@@ -364,4 +364,40 @@ public interface AsyncAdmin {
    * @param hri
    */
   CompletableFuture<Void> closeRegion(ServerName sn, HRegionInfo hri);
+
+  /**
+   * Merge two regions.
+   * @param nameOfRegionA encoded or full name of region a
+   * @param nameOfRegionB encoded or full name of region b
+   * @param forcible true if do a compulsory merge, otherwise we will only merge two adjacent
+   *          regions
+   */
+  CompletableFuture<Void> mergeRegions(final byte[] nameOfRegionA, final byte[] nameOfRegionB,
+      final boolean forcible);
+
+  /**
+   * Split a table. The method will execute split action for each region in table.
+   * @param tableName table to split
+   */
+  CompletableFuture<Void> split(final TableName tableName);
+
+  /**
+   * Split an individual region.
+   * @param regionName region to split
+   */
+  CompletableFuture<Void> splitRegion(final byte[] regionName);
+
+  /**
+   * Split a table.
+   * @param tableName table to split
+   * @param splitPoint the explicit position to split on
+   */
+  CompletableFuture<Void> split(final TableName tableName, final byte[] splitPoint);
+
+  /**
+   * Split an individual region.
+   * @param regionName region to split
+   * @param splitPoint the explicit position to split on
+   */
+  CompletableFuture<Void> splitRegion(final byte[] regionName, final byte[] splitPoint);
 }
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 e2dc3d521c1..5ae30d75d37 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
@@ -20,14 +20,18 @@ package org.apache.hadoop.hbase.client;
 import static org.apache.hadoop.hbase.TableName.META_TABLE_NAME;
 
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.BiConsumer;
 import java.util.regex.Pattern;
 
+import com.google.common.annotations.VisibleForTesting;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.hbase.HColumnDescriptor;
@@ -35,6 +39,7 @@ import org.apache.hadoop.hbase.HRegionInfo;
 import org.apache.hadoop.hbase.HRegionLocation;
 import org.apache.hadoop.hbase.HTableDescriptor;
 import org.apache.hadoop.hbase.MetaTableAccessor;
+import org.apache.hadoop.hbase.MetaTableAccessor.QueryType;
 import org.apache.hadoop.hbase.NotServingRegionException;
 import org.apache.hadoop.hbase.RegionLocations;
 import org.apache.hadoop.hbase.ServerName;
@@ -49,6 +54,7 @@ import org.apache.hadoop.hbase.classification.InterfaceStability;
 import org.apache.hadoop.hbase.client.AsyncRpcRetryingCallerFactory.AdminRequestCallerBuilder;
 import org.apache.hadoop.hbase.client.AsyncRpcRetryingCallerFactory.MasterRequestCallerBuilder;
 import org.apache.hadoop.hbase.client.Scan.ReadType;
+import org.apache.hadoop.hbase.exceptions.DeserializationException;
 import org.apache.hadoop.hbase.ipc.HBaseRpcController;
 import org.apache.hadoop.hbase.shaded.com.google.protobuf.RpcCallback;
 import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
@@ -56,6 +62,8 @@ import org.apache.hadoop.hbase.shaded.protobuf.RequestConverter;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.AdminProtos.AdminService;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.AdminProtos.CloseRegionRequest;
 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.TableSchema;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.AddColumnRequest;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.AddColumnResponse;
@@ -90,6 +98,8 @@ import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.IsBalancer
 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;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.ModifyColumnRequest;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.ModifyColumnResponse;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.ModifyNamespaceRequest;
@@ -670,6 +680,227 @@ public class AsyncHBaseAdmin implements AsyncAdmin {
         .serverName(sn).call();
   }
 
+  private byte[] toEncodeRegionName(byte[] regionName) {
+    try {
+      return HRegionInfo.isEncodedRegionName(regionName) ? regionName
+          : Bytes.toBytes(HRegionInfo.encodeRegionName(regionName));
+    } catch (IOException e) {
+      return regionName;
+    }
+  }
+
+  private void checkAndGetTableName(byte[] encodeRegionName, AtomicReference<TableName> tableName,
+      CompletableFuture<TableName> result) {
+    getRegion(encodeRegionName).whenComplete((p, err) -> {
+      if (err != null) {
+        result.completeExceptionally(err);
+        return;
+      }
+      if (p == null) {
+        result.completeExceptionally(new UnknownRegionException(
+            "Can't invoke merge on unknown region " + Bytes.toStringBinary(encodeRegionName)));
+        return;
+      }
+      if (p.getFirst().getReplicaId() != HRegionInfo.DEFAULT_REPLICA_ID) {
+        result.completeExceptionally(
+          new IllegalArgumentException("Can't invoke merge on non-default regions directly"));
+        return;
+      }
+      if (!tableName.compareAndSet(null, p.getFirst().getTable())) {
+        if (!tableName.get().equals(p.getFirst().getTable())) {
+          // tables of this two region should be same.
+          result.completeExceptionally(
+            new IllegalArgumentException("Cannot merge regions from two different tables "
+                + tableName.get() + " and " + p.getFirst().getTable()));
+        } else {
+          result.complete(tableName.get());
+        }
+      }
+    });
+  }
+
+  private CompletableFuture<TableName> checkRegionsAndGetTableName(byte[] encodeRegionNameA,
+      byte[] encodeRegionNameB) {
+    AtomicReference<TableName> tableNameRef = new AtomicReference<>();
+    CompletableFuture<TableName> future = new CompletableFuture<>();
+
+    checkAndGetTableName(encodeRegionNameA, tableNameRef, future);
+    checkAndGetTableName(encodeRegionNameB, tableNameRef, future);
+    return future;
+  }
+
+  @Override
+  public CompletableFuture<Void> mergeRegions(byte[] nameOfRegionA, byte[] nameOfRegionB,
+      boolean forcible) {
+    CompletableFuture<Void> future = new CompletableFuture<>();
+    final byte[] encodeRegionNameA = toEncodeRegionName(nameOfRegionA);
+    final byte[] encodeRegionNameB = toEncodeRegionName(nameOfRegionB);
+
+    checkRegionsAndGetTableName(encodeRegionNameA, encodeRegionNameB)
+        .whenComplete((tableName, err) -> {
+          if (err != null) {
+            future.completeExceptionally(err);
+            return;
+          }
+
+          MergeTableRegionsRequest request = null;
+          try {
+            request = RequestConverter.buildMergeTableRegionsRequest(
+              new byte[][] { encodeRegionNameA, encodeRegionNameB }, forcible, ng.getNonceGroup(),
+              ng.newNonce());
+          } catch (DeserializationException e) {
+            future.completeExceptionally(e);
+            return;
+          }
+
+          this.<MergeTableRegionsRequest, MergeTableRegionsResponse> procedureCall(request,
+            (s, c, req, done) -> s.mergeTableRegions(c, req, done), (resp) -> resp.getProcId(),
+            new MergeTableRegionProcedureBiConsumer(this, tableName)).whenComplete((ret, err2) -> {
+              if (err2 != null) {
+                future.completeExceptionally(err2);
+              } else {
+                future.complete(ret);
+              }
+            });
+
+        });
+    return future;
+  }
+
+  @Override
+  public CompletableFuture<Void> split(TableName tableName) {
+    CompletableFuture<Void> future = new CompletableFuture<>();
+    tableExists(tableName).whenComplete((exist, error) -> {
+      if (error != null) {
+        future.completeExceptionally(error);
+        return;
+      }
+      if (!exist) {
+        future.completeExceptionally(new TableNotFoundException(tableName));
+        return;
+      }
+      metaTable
+          .scanAll(new Scan().setReadType(ReadType.PREAD).addFamily(HConstants.CATALOG_FAMILY)
+              .withStartRow(MetaTableAccessor.getTableStartRowForMeta(tableName, QueryType.REGION))
+              .withStopRow(MetaTableAccessor.getTableStopRowForMeta(tableName, QueryType.REGION)))
+          .whenComplete((results, err2) -> {
+            if (err2 != null) {
+              future.completeExceptionally(err2);
+              return;
+            }
+            if (results != null && !results.isEmpty()) {
+              List<CompletableFuture<Void>> splitFutures = new ArrayList<>();
+              for (Result r : results) {
+                if (r.isEmpty() || MetaTableAccessor.getHRegionInfo(r) == null) continue;
+                RegionLocations rl = MetaTableAccessor.getRegionLocations(r);
+                if (rl != null) {
+                  for (HRegionLocation h : rl.getRegionLocations()) {
+                    if (h != null && h.getServerName() != null) {
+                      HRegionInfo hri = h.getRegionInfo();
+                      if (hri == null || hri.isSplitParent()
+                          || hri.getReplicaId() != HRegionInfo.DEFAULT_REPLICA_ID)
+                        continue;
+                      splitFutures.add(split(h.getServerName(), hri, null));
+                    }
+                  }
+                }
+              }
+              CompletableFuture
+                  .allOf(splitFutures.toArray(new CompletableFuture<?>[splitFutures.size()]))
+                  .whenComplete((ret, exception) -> {
+                    if (exception != null) {
+                      future.completeExceptionally(exception);
+                      return;
+                    }
+                    future.complete(ret);
+                  });
+            } else {
+              future.complete(null);
+            }
+          });
+    });
+    return future;
+  }
+
+  @Override
+  public CompletableFuture<Void> splitRegion(byte[] regionName) {
+    return splitRegion(regionName, null);
+  }
+
+  @Override
+  public CompletableFuture<Void> split(TableName tableName, byte[] splitPoint) {
+    CompletableFuture<Void> result = new CompletableFuture<>();
+    if (splitPoint == null) {
+      return failedFuture(new IllegalArgumentException("splitPoint can not be null."));
+    }
+    connection.getRegionLocator(tableName).getRegionLocation(splitPoint)
+        .whenComplete((loc, err) -> {
+          if (err != null) {
+            result.completeExceptionally(err);
+          } else if (loc == null || loc.getRegionInfo() == null) {
+            result.completeExceptionally(new IllegalArgumentException(
+                "Region does not found: rowKey=" + Bytes.toStringBinary(splitPoint)));
+          } else {
+            splitRegion(loc.getRegionInfo().getRegionName(), splitPoint)
+                .whenComplete((ret, err2) -> {
+                  if (err2 != null) {
+                    result.completeExceptionally(err2);
+                  } else {
+                    result.complete(ret);
+                  }
+
+                });
+          }
+        });
+    return result;
+  }
+
+  @Override
+  public CompletableFuture<Void> splitRegion(byte[] regionName, byte[] splitPoint) {
+    CompletableFuture<Void> future = new CompletableFuture<>();
+    getRegion(regionName).whenComplete((p, err) -> {
+      if (p == null) {
+        future.completeExceptionally(
+          new IllegalArgumentException("Invalid region: " + Bytes.toStringBinary(regionName)));
+        return;
+      }
+      if (p.getFirst() != null && p.getFirst().getReplicaId() != HRegionInfo.DEFAULT_REPLICA_ID) {
+        future.completeExceptionally(new IllegalArgumentException("Can't split replicas directly. "
+            + "Replicas are auto-split when their primary is split."));
+        return;
+      }
+      if (p.getSecond() == null) {
+        future.completeExceptionally(
+          new NoServerForRegionException(Bytes.toStringBinary(regionName)));
+        return;
+      }
+      split(p.getSecond(), p.getFirst(), splitPoint).whenComplete((ret, err2) -> {
+        if (err2 != null) {
+          future.completeExceptionally(err2);
+        } else {
+          future.complete(ret);
+        }
+      });
+    });
+    return future;
+  }
+
+  @VisibleForTesting
+  public CompletableFuture<Void> split(final ServerName sn, final HRegionInfo hri,
+      byte[] splitPoint) {
+    if (hri.getStartKey() != null && splitPoint != null
+        && Bytes.compareTo(hri.getStartKey(), splitPoint) == 0) {
+      return failedFuture(
+        new IllegalArgumentException("should not give a splitkey which equals to startkey!"));
+    }
+    return this.<Void> newAdminCaller()
+        .action(
+          (controller, stub) -> this.<SplitRegionRequest, SplitRegionResponse, Void> adminCall(
+            controller, stub, ProtobufUtil.buildSplitRegionRequest(hri.getRegionName(), splitPoint),
+            (s, c, req, done) -> s.splitRegion(controller, req, done), resp -> null))
+        .serverName(sn).call();
+  }
+
   private byte[][] getSplitKeys(byte[] startKey, byte[] endKey, int numRegions) {
     if (numRegions < 3) {
       throw new IllegalArgumentException("Must create at least three regions");
@@ -885,6 +1116,17 @@ public class AsyncHBaseAdmin implements AsyncAdmin {
     }
   }
 
+  private class MergeTableRegionProcedureBiConsumer extends TableProcedureBiConsumer {
+
+    MergeTableRegionProcedureBiConsumer(AsyncAdmin admin, TableName tableName) {
+      super(admin, tableName);
+    }
+
+    String getOperationType() {
+      return "MERGE_REGIONS";
+    }
+  }
+
   private CompletableFuture<Void> waitProcedureResult(CompletableFuture<Long> procFuture) {
     CompletableFuture<Void> future = new CompletableFuture<>();
     procFuture.whenComplete((procId, error) -> {
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 13680389604..155a272accc 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
@@ -1497,19 +1497,6 @@ public class HBaseAdmin implements Admin {
     });
   }
 
-  private boolean isEncodedRegionName(byte[] regionName) throws IOException {
-    try {
-      HRegionInfo.parseRegionName(regionName);
-      return false;
-    } catch (IOException e) {
-      if (StringUtils.stringifyException(e)
-        .contains(HRegionInfo.INVALID_REGION_NAME_FORMAT_MESSAGE)) {
-        return true;
-      }
-      throw e;
-    }
-  }
-
   /**
    * Merge two regions. Synchronous operation.
    * Note: It is not feasible to predict the length of merge.
@@ -1582,7 +1569,7 @@ public class HBaseAdmin implements Admin {
     assert(nameofRegionsToMerge.length >= 2);
     byte[][] encodedNameofRegionsToMerge = new byte[nameofRegionsToMerge.length][];
     for(int i = 0; i < nameofRegionsToMerge.length; i++) {
-      encodedNameofRegionsToMerge[i] = isEncodedRegionName(nameofRegionsToMerge[i]) ?
+      encodedNameofRegionsToMerge[i] = HRegionInfo.isEncodedRegionName(nameofRegionsToMerge[i]) ?
         nameofRegionsToMerge[i] : HRegionInfo.encodeRegionName(nameofRegionsToMerge[i]).getBytes();
     }
 
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncRegionAdminApi.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncRegionAdminApi.java
index 383b28f5694..980e07a6300 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncRegionAdminApi.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncRegionAdminApi.java
@@ -17,10 +17,12 @@
  */
 package org.apache.hadoop.hbase.client;
 
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
+import java.util.ArrayList;
 import java.util.List;
 
 import org.apache.hadoop.hbase.HColumnDescriptor;
@@ -200,4 +202,98 @@ public class TestAsyncRegionAdminApi extends TestAsyncAdminBase {
       assertTrue(Bytes.equals(regionName, pair.getFirst().getRegionName()));
     }
   }
+
+  @Test
+  public void testMergeRegions() throws Exception {
+    final TableName tableName = TableName.valueOf("testMergeRegions");
+    HColumnDescriptor cd = new HColumnDescriptor("d");
+    HTableDescriptor td = new HTableDescriptor(tableName);
+    td.addFamily(cd);
+    byte[][] splitRows = new byte[][] { "3".getBytes(), "6".getBytes() };
+    Admin syncAdmin = TEST_UTIL.getAdmin();
+    try {
+      TEST_UTIL.createTable(td, splitRows);
+      TEST_UTIL.waitTableAvailable(tableName);
+
+      List<HRegionInfo> tableRegions;
+      HRegionInfo regionA;
+      HRegionInfo regionB;
+
+      // merge with full name
+      tableRegions = syncAdmin.getTableRegions(tableName);
+      assertEquals(3, syncAdmin.getTableRegions(tableName).size());
+      regionA = tableRegions.get(0);
+      regionB = tableRegions.get(1);
+      admin.mergeRegions(regionA.getRegionName(), regionB.getRegionName(), false).get();
+
+      assertEquals(2, syncAdmin.getTableRegions(tableName).size());
+
+      // merge with encoded name
+      tableRegions = syncAdmin.getTableRegions(tableName);
+      regionA = tableRegions.get(0);
+      regionB = tableRegions.get(1);
+      admin.mergeRegions(regionA.getRegionName(), regionB.getRegionName(), false).get();
+
+      assertEquals(1, syncAdmin.getTableRegions(tableName).size());
+    } finally {
+      syncAdmin.disableTable(tableName);
+      syncAdmin.deleteTable(tableName);
+    }
+  }
+
+  @Test
+  public void testSplitTable() throws Exception {
+    splitTests(TableName.valueOf("testSplitTable"), 3000, false, null);
+    splitTests(TableName.valueOf("testSplitTableWithSplitPoint"), 3000, false, Bytes.toBytes("3"));
+    splitTests(TableName.valueOf("testSplitRegion"), 3000, true, null);
+    splitTests(TableName.valueOf("testSplitRegionWithSplitPoint"), 3000, true, Bytes.toBytes("3"));
+  }
+
+  private void splitTests(TableName tableName, int rowCount, boolean isSplitRegion,
+      byte[] splitPoint) throws Exception {
+    int count = 0;
+    // create table
+    HColumnDescriptor cd = new HColumnDescriptor("d");
+    HTableDescriptor td = new HTableDescriptor(tableName);
+    td.addFamily(cd);
+    Table table = TEST_UTIL.createTable(td, null);
+    TEST_UTIL.waitTableAvailable(tableName);
+
+    List<HRegionInfo> regions = TEST_UTIL.getAdmin().getTableRegions(tableName);
+    assertEquals(regions.size(), 1);
+
+    List<Put> puts = new ArrayList<>();
+    for (int i = 0; i < rowCount; i++) {
+      Put put = new Put(Bytes.toBytes(i));
+      put.addColumn(Bytes.toBytes("d"), null, Bytes.toBytes("value" + i));
+      puts.add(put);
+    }
+    table.put(puts);
+
+    if (isSplitRegion) {
+      admin.splitRegion(regions.get(0).getRegionName(), splitPoint).get();
+    } else {
+      if (splitPoint == null) {
+        admin.split(tableName).get();
+      } else {
+        admin.split(tableName, splitPoint).get();
+      }
+    }
+
+    for (int i = 0; i < 45; i++) {
+      try {
+        List<HRegionInfo> hRegionInfos = TEST_UTIL.getAdmin().getTableRegions(tableName);
+        count = hRegionInfos.size();
+        if (count >= 2) {
+          break;
+        }
+        Thread.sleep(1000L);
+      } catch (Exception e) {
+        LOG.error(e);
+      }
+    }
+
+    assertEquals(count, 2);
+  }
+
 }