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From apurt...@apache.org
Subject hbase git commit: HBASE-13057 Provide client utility to easily enable and disable table replication (Ashish Singhi)
Date Wed, 20 May 2015 22:23:16 GMT
Repository: hbase
Updated Branches:
  refs/heads/branch-1.0 6ad7e49ac -> 59da88167


HBASE-13057 Provide client utility to easily enable and disable table replication (Ashish
Singhi)


Project: http://git-wip-us.apache.org/repos/asf/hbase/repo
Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/59da8816
Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/59da8816
Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/59da8816

Branch: refs/heads/branch-1.0
Commit: 59da8816739ad09fa8b8a01bdad30b47799ffb80
Parents: 6ad7e49
Author: tedyu <yuzhihong@gmail.com>
Authored: Fri Feb 20 10:27:20 2015 -0800
Committer: Andrew Purtell <apurtell@apache.org>
Committed: Wed May 20 15:10:46 2015 -0700

----------------------------------------------------------------------
 .../client/replication/ReplicationAdmin.java    | 206 +++++++++++++++++++
 .../TestReplicationAdminWithClusters.java       | 162 +++++++++++++++
 .../src/main/ruby/hbase/replication_admin.rb    |  13 ++
 hbase-shell/src/main/ruby/shell.rb              |   2 +
 .../shell/commands/disable_table_replication.rb |  42 ++++
 .../shell/commands/enable_table_replication.rb  |  42 ++++
 6 files changed, 467 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hbase/blob/59da8816/hbase-client/src/main/java/org/apache/hadoop/hbase/client/replication/ReplicationAdmin.java
----------------------------------------------------------------------
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/replication/ReplicationAdmin.java
b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/replication/ReplicationAdmin.java
index 2ada823..1bb18b2 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/replication/ReplicationAdmin.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/replication/ReplicationAdmin.java
@@ -40,18 +40,26 @@ import org.apache.hadoop.hbase.HColumnDescriptor;
 import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.HTableDescriptor;
 import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.TableNotFoundException;
 import org.apache.hadoop.hbase.classification.InterfaceAudience;
 import org.apache.hadoop.hbase.classification.InterfaceStability;
 import org.apache.hadoop.hbase.client.Admin;
 import org.apache.hadoop.hbase.client.HBaseAdmin;
 import org.apache.hadoop.hbase.client.Connection;
 import org.apache.hadoop.hbase.client.ConnectionFactory;
+import org.apache.hadoop.hbase.client.RegionLocator;
 import org.apache.hadoop.hbase.replication.ReplicationException;
 import org.apache.hadoop.hbase.replication.ReplicationFactory;
+import org.apache.hadoop.hbase.replication.ReplicationPeer;
 import org.apache.hadoop.hbase.replication.ReplicationPeerConfig;
+import org.apache.hadoop.hbase.replication.ReplicationPeerZKImpl;
 import org.apache.hadoop.hbase.replication.ReplicationPeers;
 import org.apache.hadoop.hbase.replication.ReplicationQueuesClient;
+import org.apache.hadoop.hbase.util.Pair;
+import org.apache.hadoop.hbase.zookeeper.ZKUtil;
 import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
+import org.apache.zookeeper.KeeperException;
+import org.apache.zookeeper.data.Stat;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.collect.Lists;
@@ -519,4 +527,202 @@ public class ReplicationAdmin implements Closeable {
 
     return replicationColFams;
   }
+
+  /**
+   * Enable a table's replication switch.
+   * @param tableName name of the table
+   * @throws IOException if a remote or network exception occurs
+   */
+  public void enableTableRep(final TableName tableName) throws IOException {
+    if (tableName == null) {
+      throw new IllegalArgumentException("Table name cannot be null");
+    }
+    try (Admin admin = this.connection.getAdmin()) {
+      if (!admin.tableExists(tableName)) {
+        throw new TableNotFoundException("Table '" + tableName.getNameAsString()
+            + "' does not exists.");
+      }
+    }
+    byte[][] splits = getTableSplitRowKeys(tableName);
+    checkAndSyncTableDescToPeers(tableName, splits);
+    setTableRep(tableName, true);
+  }
+
+  /**
+   * Disable a table's replication switch.
+   * @param tableName name of the table
+   * @throws IOException if a remote or network exception occurs
+   */
+  public void disableTableRep(final TableName tableName) throws IOException {
+    if (tableName == null) {
+      throw new IllegalArgumentException("Table name is null");
+    }
+    try (Admin admin = this.connection.getAdmin()) {
+      if (!admin.tableExists(tableName)) {
+        throw new TableNotFoundException("Table '" + tableName.getNamespaceAsString()
+            + "' does not exists.");
+      }
+    }
+    setTableRep(tableName, false);
+  }
+
+  /**
+   * Get the split row keys of table
+   * @param tableName table name
+   * @return array of split row keys
+   * @throws IOException
+   */
+  private byte[][] getTableSplitRowKeys(TableName tableName) throws IOException {
+    try (RegionLocator locator = connection.getRegionLocator(tableName);) {
+      byte[][] startKeys = locator.getStartKeys();
+      if (startKeys.length == 1) {
+        return null;
+      }
+      byte[][] splits = new byte[startKeys.length - 1][];
+      for (int i = 1; i < startKeys.length; i++) {
+        splits[i - 1] = startKeys[i];
+      }
+      return splits;
+    }
+  }
+
+  /**
+   * Connect to peer and check the table descriptor on peer:
+   * <ol>
+   * <li>Create the same table on peer when not exist.</li>
+   * <li>Throw exception if the table exists on peer cluster but descriptors are not
same.</li>
+   * </ol>
+   * @param tableName name of the table to sync to the peer
+   * @param splits table split keys
+   * @throws IOException
+   */
+  private void checkAndSyncTableDescToPeers(final TableName tableName, final byte[][] splits)
+      throws IOException {
+    List<ReplicationPeer> repPeers = listValidReplicationPeers();
+    if (repPeers == null || repPeers.size() <= 0) {
+      throw new IllegalArgumentException("Found no peer cluster for replication.");
+    }
+    for (ReplicationPeer repPeer : repPeers) {
+      Configuration peerConf = repPeer.getConfiguration();
+      HTableDescriptor htd = null;
+      try (Connection conn = ConnectionFactory.createConnection(peerConf);
+          Admin admin = this.connection.getAdmin();
+          Admin repHBaseAdmin = conn.getAdmin()) {
+        htd = admin.getTableDescriptor(tableName);
+        HTableDescriptor peerHtd = null;
+        if (!repHBaseAdmin.tableExists(tableName)) {
+          repHBaseAdmin.createTable(htd, splits);
+        } else {
+          peerHtd = repHBaseAdmin.getTableDescriptor(tableName);
+          if (peerHtd == null) {
+            throw new IllegalArgumentException("Failed to get table descriptor for table
"
+                + tableName.getNameAsString() + " from peer cluster " + repPeer.getId());
+          } else if (!peerHtd.equals(htd)) {
+            throw new IllegalArgumentException("Table " + tableName.getNameAsString()
+                + " exists in peer cluster " + repPeer.getId()
+                + ", but the table descriptors are not same when comapred with source cluster."
+                + " Thus can not enable the table's replication switch.");
+          }
+        }
+      }
+    }
+  }
+
+  private List<ReplicationPeer> listValidReplicationPeers() {
+    Map<String, ReplicationPeerConfig> peers = listPeerConfigs();
+    if (peers == null || peers.size() <= 0) {
+      return null;
+    }
+    List<ReplicationPeer> validPeers = new ArrayList<ReplicationPeer>(peers.size());
+    for (Entry<String, ReplicationPeerConfig> peerEntry : peers.entrySet()) {
+      String peerId = peerEntry.getKey();
+      String clusterKey = peerEntry.getValue().getClusterKey();
+      Configuration peerConf = new Configuration(this.connection.getConfiguration());
+      Stat s = null;
+      try {
+        ZKUtil.applyClusterKeyToConf(peerConf, clusterKey);
+        Pair<ReplicationPeerConfig, Configuration> pair = this.replicationPeers.getPeerConf(peerId);
+        ReplicationPeer peer = new ReplicationPeerZKImpl(peerConf, peerId, pair.getFirst());
+        s =
+            zkw.getRecoverableZooKeeper().exists(peerConf.get(HConstants.ZOOKEEPER_ZNODE_PARENT),
+              null);
+        if (null == s) {
+          LOG.info(peerId + ' ' + clusterKey + " is invalid now.");
+          continue;
+        }
+        validPeers.add(peer);
+      } catch (ReplicationException e) {
+        LOG.warn("Failed to get valid replication peers. "
+            + "Error connecting to peer cluster with peerId=" + peerId);
+        LOG.debug("Failure details to get valid replication peers.", e);
+        continue;
+      } catch (KeeperException e) {
+        LOG.warn("Failed to get valid replication peers. KeeperException code="
+            + e.code().intValue());
+        LOG.debug("Failure details to get valid replication peers.", e);
+        continue;
+      } catch (InterruptedException e) {
+        LOG.warn("Failed to get valid replication peers due to InterruptedException.");
+        LOG.debug("Failure details to get valid replication peers.", e);
+        continue;
+      } catch (IOException e) {
+        LOG.warn("Failed to get valid replication peers due to IOException.");
+        LOG.debug("Failure details to get valid replication peers.", e);
+        continue;
+      }
+    }
+    return validPeers;
+  }
+
+  /**
+   * Set the table's replication switch if the table's replication switch is already not
set.
+   * @param tableName name of the table
+   * @param isRepEnabled is replication switch enable or disable
+   * @throws IOException if a remote or network exception occurs
+   */
+  private void setTableRep(final TableName tableName, boolean isRepEnabled) throws IOException
{
+    Admin admin = null;
+    try {
+      admin = this.connection.getAdmin();
+      HTableDescriptor htd = admin.getTableDescriptor(tableName);
+      if (isTableRepEnabled(htd) ^ isRepEnabled) {
+        boolean isOnlineSchemaUpdateEnabled =
+            this.connection.getConfiguration()
+                .getBoolean("hbase.online.schema.update.enable", true);
+        if (!isOnlineSchemaUpdateEnabled) {
+          admin.disableTable(tableName);
+        }
+        for (HColumnDescriptor hcd : htd.getFamilies()) {
+          hcd.setScope(isRepEnabled ? HConstants.REPLICATION_SCOPE_GLOBAL
+              : HConstants.REPLICATION_SCOPE_LOCAL);
+        }
+        admin.modifyTable(tableName, htd);
+        if (!isOnlineSchemaUpdateEnabled) {
+          admin.enableTable(tableName);
+        }
+      }
+    } finally {
+      if (admin != null) {
+        try {
+          admin.close();
+        } catch (IOException e) {
+          LOG.warn("Failed to close admin connection.");
+          LOG.debug("Details on failure to close admin connection.", e);
+        }
+      }
+    }
+  }
+
+  /**
+   * @param htd table descriptor details for the table to check
+   * @return true if table's replication switch is enabled
+   */
+  private boolean isTableRepEnabled(HTableDescriptor htd) {
+    for (HColumnDescriptor hcd : htd.getFamilies()) {
+      if (hcd.getScope() != HConstants.REPLICATION_SCOPE_GLOBAL) {
+        return false;
+      }
+    }
+    return true;
+  }
 }

http://git-wip-us.apache.org/repos/asf/hbase/blob/59da8816/hbase-server/src/test/java/org/apache/hadoop/hbase/client/replication/TestReplicationAdminWithClusters.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/client/replication/TestReplicationAdminWithClusters.java
b/hbase-server/src/test/java/org/apache/hadoop/hbase/client/replication/TestReplicationAdminWithClusters.java
new file mode 100644
index 0000000..0d4e853
--- /dev/null
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/client/replication/TestReplicationAdminWithClusters.java
@@ -0,0 +1,162 @@
+/**
+ * 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.replication;
+
+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 org.apache.hadoop.hbase.HColumnDescriptor;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.HTableDescriptor;
+import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.TableNotFoundException;
+import org.apache.hadoop.hbase.client.Admin;
+import org.apache.hadoop.hbase.client.Connection;
+import org.apache.hadoop.hbase.client.ConnectionFactory;
+import org.apache.hadoop.hbase.replication.TestReplicationBase;
+import org.apache.hadoop.hbase.testclassification.MediumTests;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+/**
+ * Unit testing of ReplicationAdmin with clusters
+ */
+@Category({ MediumTests.class })
+public class TestReplicationAdminWithClusters extends TestReplicationBase {
+
+  static Connection connection1;
+  static Connection connection2;
+  static Admin admin1;
+  static Admin admin2;
+
+  @BeforeClass
+  public static void setUpBeforeClass() throws Exception {
+    TestReplicationBase.setUpBeforeClass();
+    connection1 = ConnectionFactory.createConnection(conf1);
+    connection2 = ConnectionFactory.createConnection(conf2);
+    admin1 = connection1.getAdmin();
+    admin2 = connection2.getAdmin();
+  }
+
+  @AfterClass
+  public static void tearDownAfterClass() throws Exception {
+    admin1.close();
+    admin2.close();
+    connection1.close();
+    connection2.close();
+    TestReplicationBase.tearDownAfterClass();
+  }
+
+  @Test(timeout = 300000)
+  public void testEnableReplicationWhenSlaveClusterDoesntHaveTable() throws Exception {
+    admin2.disableTable(tableName);
+    admin2.deleteTable(tableName);
+    assertFalse(admin2.tableExists(tableName));
+    ReplicationAdmin adminExt = new ReplicationAdmin(conf1);
+    adminExt.enableTableRep(tableName);
+    assertTrue(admin2.tableExists(tableName));
+  }
+
+  @Test(timeout = 300000)
+  public void testEnableReplicationWhenReplicationNotEnabled() throws Exception {
+    HTableDescriptor table = admin1.getTableDescriptor(tableName);
+    for (HColumnDescriptor fam : table.getColumnFamilies()) {
+      fam.setScope(HConstants.REPLICATION_SCOPE_LOCAL);
+    }
+    admin1.disableTable(tableName);
+    admin1.modifyTable(tableName, table);
+    admin1.enableTable(tableName);
+
+    admin2.disableTable(tableName);
+    admin2.modifyTable(tableName, table);
+    admin2.enableTable(tableName);
+
+    ReplicationAdmin adminExt = new ReplicationAdmin(conf1);
+    adminExt.enableTableRep(tableName);
+    table = admin1.getTableDescriptor(tableName);
+    for (HColumnDescriptor fam : table.getColumnFamilies()) {
+      assertEquals(fam.getScope(), HConstants.REPLICATION_SCOPE_GLOBAL);
+    }
+  }
+
+  @Test(timeout = 300000)
+  public void testEnableReplicationWhenTableDescriptorIsNotSameInClusters() throws Exception
{
+    HTableDescriptor table = admin2.getTableDescriptor(tableName);
+    HColumnDescriptor f = new HColumnDescriptor("newFamily");
+    table.addFamily(f);
+    admin2.disableTable(tableName);
+    admin2.modifyTable(tableName, table);
+    admin2.enableTable(tableName);
+
+    ReplicationAdmin adminExt = new ReplicationAdmin(conf1);
+    try {
+      adminExt.enableTableRep(tableName);
+      fail("Exception should be thrown if table descriptors in the clusters are not same.");
+    } catch (RuntimeException ignored) {
+
+    }
+    admin1.disableTable(tableName);
+    admin1.modifyTable(tableName, table);
+    admin1.enableTable(tableName);
+    adminExt.enableTableRep(tableName);
+    table = admin1.getTableDescriptor(tableName);
+    for (HColumnDescriptor fam : table.getColumnFamilies()) {
+      assertEquals(fam.getScope(), HConstants.REPLICATION_SCOPE_GLOBAL);
+    }
+  }
+
+  @Test(timeout = 300000)
+  public void testDisableAndEnableReplication() throws Exception {
+    ReplicationAdmin adminExt = new ReplicationAdmin(conf1);
+    adminExt.disableTableRep(tableName);
+    HTableDescriptor table = admin1.getTableDescriptor(tableName);
+    for (HColumnDescriptor fam : table.getColumnFamilies()) {
+      assertEquals(fam.getScope(), HConstants.REPLICATION_SCOPE_LOCAL);
+    }
+    table = admin2.getTableDescriptor(tableName);
+    for (HColumnDescriptor fam : table.getColumnFamilies()) {
+      assertEquals(fam.getScope(), HConstants.REPLICATION_SCOPE_LOCAL);
+    }
+    adminExt.enableTableRep(tableName);
+    table = admin1.getTableDescriptor(tableName);
+    for (HColumnDescriptor fam : table.getColumnFamilies()) {
+      assertEquals(fam.getScope(), HConstants.REPLICATION_SCOPE_GLOBAL);
+    }
+  }
+
+  @Test(timeout = 300000, expected = TableNotFoundException.class)
+  public void testDisableReplicationForNonExistingTable() throws Exception {
+    ReplicationAdmin adminExt = new ReplicationAdmin(conf1);
+    adminExt.disableTableRep(TableName.valueOf("nonExistingTable"));
+  }
+
+  @Test(timeout = 300000, expected = TableNotFoundException.class)
+  public void testEnableReplicationForNonExistingTable() throws Exception {
+    ReplicationAdmin adminExt = new ReplicationAdmin(conf1);
+    adminExt.enableTableRep(TableName.valueOf("nonExistingTable"));
+  }
+
+  @Test(timeout = 300000, expected = IllegalArgumentException.class)
+  public void testDisableReplicationWhenTableNameAsNull() throws Exception {
+    ReplicationAdmin adminExt = new ReplicationAdmin(conf1);
+    adminExt.disableTableRep(null);
+  }
+
+  @Test(timeout = 300000, expected = IllegalArgumentException.class)
+  public void testEnableReplicationWhenTableNameAsNull() throws Exception {
+    ReplicationAdmin adminExt = new ReplicationAdmin(conf1);
+    adminExt.enableTableRep(null);
+  }
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/59da8816/hbase-shell/src/main/ruby/hbase/replication_admin.rb
----------------------------------------------------------------------
diff --git a/hbase-shell/src/main/ruby/hbase/replication_admin.rb b/hbase-shell/src/main/ruby/hbase/replication_admin.rb
index 2d0845f..b2ca8e1 100644
--- a/hbase-shell/src/main/ruby/hbase/replication_admin.rb
+++ b/hbase-shell/src/main/ruby/hbase/replication_admin.rb
@@ -23,6 +23,7 @@ java_import org.apache.hadoop.hbase.client.replication.ReplicationAdmin
 java_import org.apache.hadoop.hbase.replication.ReplicationPeerConfig
 java_import org.apache.hadoop.hbase.util.Bytes
 java_import org.apache.hadoop.hbase.zookeeper.ZKUtil
+java_import org.apache.hadoop.hbase.TableName
 
 # Wrapper for org.apache.hadoop.hbase.client.replication.ReplicationAdmin
 
@@ -157,5 +158,17 @@ module Hbase
     def remove_peer_tableCFs(id, tableCFs)
       @replication_admin.removePeerTableCFs(id, tableCFs)
     end
+    #----------------------------------------------------------------------------------------------
+    # Enables a table's replication switch
+    def enable_tablerep(table_name)
+      tableName = TableName.valueOf(table_name)
+      @replication_admin.enableTableRep(tableName)
+    end
+    #----------------------------------------------------------------------------------------------
+    # Disables a table's replication switch
+    def disable_tablerep(table_name)
+      tableName = TableName.valueOf(table_name)
+      @replication_admin.disableTableRep(tableName)
+    end
   end
 end

http://git-wip-us.apache.org/repos/asf/hbase/blob/59da8816/hbase-shell/src/main/ruby/shell.rb
----------------------------------------------------------------------
diff --git a/hbase-shell/src/main/ruby/shell.rb b/hbase-shell/src/main/ruby/shell.rb
index 5870d8f..994a195 100644
--- a/hbase-shell/src/main/ruby/shell.rb
+++ b/hbase-shell/src/main/ruby/shell.rb
@@ -342,6 +342,8 @@ Shell.load_command_group(
     list_replicated_tables
     append_peer_tableCFs
     remove_peer_tableCFs
+    enable_table_replication
+    disable_table_replication
   ]
 )
 

http://git-wip-us.apache.org/repos/asf/hbase/blob/59da8816/hbase-shell/src/main/ruby/shell/commands/disable_table_replication.rb
----------------------------------------------------------------------
diff --git a/hbase-shell/src/main/ruby/shell/commands/disable_table_replication.rb b/hbase-shell/src/main/ruby/shell/commands/disable_table_replication.rb
new file mode 100644
index 0000000..4c46fea
--- /dev/null
+++ b/hbase-shell/src/main/ruby/shell/commands/disable_table_replication.rb
@@ -0,0 +1,42 @@
+#
+# Copyright 2010 The Apache Software Foundation
+#
+# 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.
+#
+
+module Shell
+  module Commands
+    class DisableTableReplication< Command
+      def help
+        return <<-EOF
+Disable a table's replication switch.
+
+Examples:
+
+  hbase> disable_table_replication 'table_name'
+EOF
+      end
+
+      def command(table_name)
+        format_simple_command do
+          replication_admin.disable_tablerep(table_name)
+        end
+        puts "The replication swith of table '#{table_name}' successfully disabled"
+      end
+    end
+  end
+end

http://git-wip-us.apache.org/repos/asf/hbase/blob/59da8816/hbase-shell/src/main/ruby/shell/commands/enable_table_replication.rb
----------------------------------------------------------------------
diff --git a/hbase-shell/src/main/ruby/shell/commands/enable_table_replication.rb b/hbase-shell/src/main/ruby/shell/commands/enable_table_replication.rb
new file mode 100644
index 0000000..5d57f03
--- /dev/null
+++ b/hbase-shell/src/main/ruby/shell/commands/enable_table_replication.rb
@@ -0,0 +1,42 @@
+#
+# Copyright 2010 The Apache Software Foundation
+#
+# 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.
+#
+
+module Shell
+  module Commands
+    class EnableTableReplication< Command
+      def help
+        return <<-EOF
+Enable a table's replication switch.
+
+Examples:
+
+  hbase> enable_table_replication 'table_name'
+EOF
+      end
+
+      def command(table_name)
+        format_simple_command do
+          replication_admin.enable_tablerep(table_name)
+        end
+        puts "The replication swith of table '#{table_name}' successfully enabled"
+      end
+    end
+  end
+end


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