/**
 * 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.replication;

import static org.junit.Assert.assertEquals;

import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.HBaseTestingUtility;
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.client.Admin;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.client.replication.ReplicationAdmin;
import org.apache.hadoop.hbase.replication.regionserver.ReplicationSyncUp;
import org.apache.hadoop.hbase.testclassification.LargeTests;
import org.apache.hadoop.hbase.testclassification.ReplicationTests;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.util.ToolRunner;
import org.junit.After;
import org.junit.Before;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Category({ ReplicationTests.class, LargeTests.class })
public class TestReplicationSyncUpTool extends TestReplicationBase {

  @ClassRule
  public static final HBaseClassTestRule CLASS_RULE =
      HBaseClassTestRule.forClass(TestReplicationSyncUpTool.class);

  private static final Logger LOG = LoggerFactory.getLogger(TestReplicationSyncUpTool.class);

  private static final TableName t1_su = TableName.valueOf("t1_syncup");
  private static final TableName t2_su = TableName.valueOf("t2_syncup");

  protected static final byte[] famName = Bytes.toBytes("cf1");
  private static final byte[] qualName = Bytes.toBytes("q1");

  protected static final byte[] noRepfamName = Bytes.toBytes("norep");

  private HTableDescriptor t1_syncupSource, t1_syncupTarget;
  private HTableDescriptor t2_syncupSource, t2_syncupTarget;

  protected Table ht1Source, ht2Source, ht1TargetAtPeer1, ht2TargetAtPeer1;

  @Before
  public void setUp() throws Exception {
    HColumnDescriptor fam;

    t1_syncupSource = new HTableDescriptor(t1_su);
    fam = new HColumnDescriptor(famName);
    fam.setScope(HConstants.REPLICATION_SCOPE_GLOBAL);
    t1_syncupSource.addFamily(fam);
    fam = new HColumnDescriptor(noRepfamName);
    t1_syncupSource.addFamily(fam);

    t1_syncupTarget = new HTableDescriptor(t1_su);
    fam = new HColumnDescriptor(famName);
    t1_syncupTarget.addFamily(fam);
    fam = new HColumnDescriptor(noRepfamName);
    t1_syncupTarget.addFamily(fam);

    t2_syncupSource = new HTableDescriptor(t2_su);
    fam = new HColumnDescriptor(famName);
    fam.setScope(HConstants.REPLICATION_SCOPE_GLOBAL);
    t2_syncupSource.addFamily(fam);
    fam = new HColumnDescriptor(noRepfamName);
    t2_syncupSource.addFamily(fam);

    t2_syncupTarget = new HTableDescriptor(t2_su);
    fam = new HColumnDescriptor(famName);
    t2_syncupTarget.addFamily(fam);
    fam = new HColumnDescriptor(noRepfamName);
    t2_syncupTarget.addFamily(fam);
  }

  @After
  public void tearDownBase() throws Exception {
    // Do nothing, just replace the super tearDown. because the super tearDown will use the
    // out-of-data HBase admin to remove replication peer, which will be result in failure.
  }

  /**
   * Add a row to a table in each cluster, check it's replicated, delete it,
   * check's gone Also check the puts and deletes are not replicated back to
   * the originating cluster.
   */
  @Test
  public void testSyncUpTool() throws Exception {

    /**
     * Set up Replication: on Master and one Slave
     * Table: t1_syncup and t2_syncup
     * columnfamily:
     *    'cf1'  : replicated
     *    'norep': not replicated
     */
    setupReplication();

    /**
     * at Master:
     * t1_syncup: put 100 rows into cf1, and 1 rows into norep
     * t2_syncup: put 200 rows into cf1, and 1 rows into norep
     *
     * verify correctly replicated to slave
     */
    putAndReplicateRows();

    /**
     * Verify delete works
     *
     * step 1: stop hbase on Slave
     *
     * step 2: at Master:
     *  t1_syncup: delete 50 rows  from cf1
     *  t2_syncup: delete 100 rows from cf1
     *  no change on 'norep'
     *
     * step 3: stop hbase on master, restart hbase on Slave
     *
     * step 4: verify Slave still have the rows before delete
     *      t1_syncup: 100 rows from cf1
     *      t2_syncup: 200 rows from cf1
     *
     * step 5: run syncup tool on Master
     *
     * step 6: verify that delete show up on Slave
     *      t1_syncup: 50 rows from cf1
     *      t2_syncup: 100 rows from cf1
     *
     * verify correctly replicated to Slave
     */
    mimicSyncUpAfterDelete();

    /**
     * Verify put works
     *
     * step 1: stop hbase on Slave
     *
     * step 2: at Master:
     *  t1_syncup: put 100 rows  from cf1
     *  t2_syncup: put 200 rows  from cf1
     *  and put another row on 'norep'
     *  ATTN: put to 'cf1' will overwrite existing rows, so end count will
     *        be 100 and 200 respectively
     *      put to 'norep' will add a new row.
     *
     * step 3: stop hbase on master, restart hbase on Slave
     *
     * step 4: verify Slave still has the rows before put
     *      t1_syncup: 50 rows from cf1
     *      t2_syncup: 100 rows from cf1
     *
     * step 5: run syncup tool on Master
     *
     * step 6: verify that put show up on Slave
     *         and 'norep' does not
     *      t1_syncup: 100 rows from cf1
     *      t2_syncup: 200 rows from cf1
     *
     * verify correctly replicated to Slave
     */
    mimicSyncUpAfterPut();
  }

  protected void setupReplication() throws Exception {
    ReplicationAdmin admin1 = new ReplicationAdmin(conf1);
    ReplicationAdmin admin2 = new ReplicationAdmin(conf2);

    Admin ha = utility1.getAdmin();
    ha.createTable(t1_syncupSource);
    ha.createTable(t2_syncupSource);
    ha.close();

    ha = utility2.getAdmin();
    ha.createTable(t1_syncupTarget);
    ha.createTable(t2_syncupTarget);
    ha.close();

    Connection connection1 = ConnectionFactory.createConnection(utility1.getConfiguration());
    Connection connection2 = ConnectionFactory.createConnection(utility2.getConfiguration());

    // Get HTable from Master
    ht1Source = connection1.getTable(t1_su);
    ht2Source = connection1.getTable(t2_su);

    // Get HTable from Peer1
    ht1TargetAtPeer1 = connection2.getTable(t1_su);
    ht2TargetAtPeer1 = connection2.getTable(t2_su);

    /**
     * set M-S : Master: utility1 Slave1: utility2
     */
    ReplicationPeerConfig rpc = new ReplicationPeerConfig();
    rpc.setClusterKey(utility2.getClusterKey());
    admin1.addPeer("1", rpc, null);

    admin1.close();
    admin2.close();
  }

  private void putAndReplicateRows() throws Exception {
    LOG.debug("putAndReplicateRows");
    // add rows to Master cluster,
    Put p;

    // 100 + 1 row to t1_syncup
    for (int i = 0; i < NB_ROWS_IN_BATCH; i++) {
      p = new Put(Bytes.toBytes("row" + i));
      p.addColumn(famName, qualName, Bytes.toBytes("val" + i));
      ht1Source.put(p);
    }
    p = new Put(Bytes.toBytes("row" + 9999));
    p.addColumn(noRepfamName, qualName, Bytes.toBytes("val" + 9999));
    ht1Source.put(p);

    // 200 + 1 row to t2_syncup
    for (int i = 0; i < NB_ROWS_IN_BATCH * 2; i++) {
      p = new Put(Bytes.toBytes("row" + i));
      p.addColumn(famName, qualName, Bytes.toBytes("val" + i));
      ht2Source.put(p);
    }
    p = new Put(Bytes.toBytes("row" + 9999));
    p.addColumn(noRepfamName, qualName, Bytes.toBytes("val" + 9999));
    ht2Source.put(p);

    // ensure replication completed
    Thread.sleep(SLEEP_TIME);
    int rowCount_ht1Source = utility1.countRows(ht1Source);
    for (int i = 0; i < NB_RETRIES; i++) {
      int rowCount_ht1TargetAtPeer1 = utility2.countRows(ht1TargetAtPeer1);
      if (i==NB_RETRIES-1) {
        assertEquals("t1_syncup has 101 rows on source, and 100 on slave1", rowCount_ht1Source - 1,
            rowCount_ht1TargetAtPeer1);
      }
      if (rowCount_ht1Source - 1 == rowCount_ht1TargetAtPeer1) {
        break;
      }
      Thread.sleep(SLEEP_TIME);
    }

    int rowCount_ht2Source = utility1.countRows(ht2Source);
    for (int i = 0; i < NB_RETRIES; i++) {
      int rowCount_ht2TargetAtPeer1 = utility2.countRows(ht2TargetAtPeer1);
      if (i==NB_RETRIES-1) {
        assertEquals("t2_syncup has 201 rows on source, and 200 on slave1", rowCount_ht2Source - 1,
            rowCount_ht2TargetAtPeer1);
      }
      if (rowCount_ht2Source - 1 == rowCount_ht2TargetAtPeer1) {
        break;
      }
      Thread.sleep(SLEEP_TIME);
    }
  }

  private void mimicSyncUpAfterDelete() throws Exception {
    LOG.debug("mimicSyncUpAfterDelete");
    utility2.shutdownMiniHBaseCluster();

    List<Delete> list = new ArrayList<>();
    // delete half of the rows
    for (int i = 0; i < NB_ROWS_IN_BATCH / 2; i++) {
      String rowKey = "row" + i;
      Delete del = new Delete(Bytes.toBytes(rowKey));
      list.add(del);
    }
    ht1Source.delete(list);

    for (int i = 0; i < NB_ROWS_IN_BATCH; i++) {
      String rowKey = "row" + i;
      Delete del = new Delete(Bytes.toBytes(rowKey));
      list.add(del);
    }
    ht2Source.delete(list);

    int rowCount_ht1Source = utility1.countRows(ht1Source);
    assertEquals("t1_syncup has 51 rows on source, after remove 50 of the replicated colfam", 51,
      rowCount_ht1Source);

    int rowCount_ht2Source = utility1.countRows(ht2Source);
    assertEquals("t2_syncup has 101 rows on source, after remove 100 of the replicated colfam",
      101, rowCount_ht2Source);

    utility1.shutdownMiniHBaseCluster();
    utility2.restartHBaseCluster(1);

    Thread.sleep(SLEEP_TIME);

    // before sync up
    int rowCount_ht1TargetAtPeer1 = utility2.countRows(ht1TargetAtPeer1);
    int rowCount_ht2TargetAtPeer1 = utility2.countRows(ht2TargetAtPeer1);
    assertEquals("@Peer1 t1_syncup should still have 100 rows", 100, rowCount_ht1TargetAtPeer1);
    assertEquals("@Peer1 t2_syncup should still have 200 rows", 200, rowCount_ht2TargetAtPeer1);

    // After sync up
    for (int i = 0; i < NB_RETRIES; i++) {
      syncUp(utility1);
      rowCount_ht1TargetAtPeer1 = utility2.countRows(ht1TargetAtPeer1);
      rowCount_ht2TargetAtPeer1 = utility2.countRows(ht2TargetAtPeer1);
      if (i == NB_RETRIES - 1) {
        if (rowCount_ht1TargetAtPeer1 != 50 || rowCount_ht2TargetAtPeer1 != 100) {
          // syncUP still failed. Let's look at the source in case anything wrong there
          utility1.restartHBaseCluster(1);
          rowCount_ht1Source = utility1.countRows(ht1Source);
          LOG.debug("t1_syncup should have 51 rows at source, and it is " + rowCount_ht1Source);
          rowCount_ht2Source = utility1.countRows(ht2Source);
          LOG.debug("t2_syncup should have 101 rows at source, and it is " + rowCount_ht2Source);
        }
        assertEquals("@Peer1 t1_syncup should be sync up and have 50 rows", 50,
          rowCount_ht1TargetAtPeer1);
        assertEquals("@Peer1 t2_syncup should be sync up and have 100 rows", 100,
          rowCount_ht2TargetAtPeer1);
      }
      if (rowCount_ht1TargetAtPeer1 == 50 && rowCount_ht2TargetAtPeer1 == 100) {
        LOG.info("SyncUpAfterDelete succeeded at retry = " + i);
        break;
      } else {
        LOG.debug("SyncUpAfterDelete failed at retry = " + i + ", with rowCount_ht1TargetPeer1 ="
            + rowCount_ht1TargetAtPeer1 + " and rowCount_ht2TargetAtPeer1 ="
            + rowCount_ht2TargetAtPeer1);
      }
      Thread.sleep(SLEEP_TIME);
    }
  }

  private void mimicSyncUpAfterPut() throws Exception {
    LOG.debug("mimicSyncUpAfterPut");
    utility1.restartHBaseCluster(1);
    utility2.shutdownMiniHBaseCluster();

    Put p;
    // another 100 + 1 row to t1_syncup
    // we should see 100 + 2 rows now
    for (int i = 0; i < NB_ROWS_IN_BATCH; i++) {
      p = new Put(Bytes.toBytes("row" + i));
      p.addColumn(famName, qualName, Bytes.toBytes("val" + i));
      ht1Source.put(p);
    }
    p = new Put(Bytes.toBytes("row" + 9998));
    p.addColumn(noRepfamName, qualName, Bytes.toBytes("val" + 9998));
    ht1Source.put(p);

    // another 200 + 1 row to t1_syncup
    // we should see 200 + 2 rows now
    for (int i = 0; i < NB_ROWS_IN_BATCH * 2; i++) {
      p = new Put(Bytes.toBytes("row" + i));
      p.addColumn(famName, qualName, Bytes.toBytes("val" + i));
      ht2Source.put(p);
    }
    p = new Put(Bytes.toBytes("row" + 9998));
    p.addColumn(noRepfamName, qualName, Bytes.toBytes("val" + 9998));
    ht2Source.put(p);

    int rowCount_ht1Source = utility1.countRows(ht1Source);
    assertEquals("t1_syncup has 102 rows on source", 102, rowCount_ht1Source);
    int rowCount_ht2Source = utility1.countRows(ht2Source);
    assertEquals("t2_syncup has 202 rows on source", 202, rowCount_ht2Source);

    utility1.shutdownMiniHBaseCluster();
    utility2.restartHBaseCluster(1);

    Thread.sleep(SLEEP_TIME);

    // before sync up
    int rowCount_ht1TargetAtPeer1 = utility2.countRows(ht1TargetAtPeer1);
    int rowCount_ht2TargetAtPeer1 = utility2.countRows(ht2TargetAtPeer1);
    assertEquals("@Peer1 t1_syncup should be NOT sync up and have 50 rows", 50,
      rowCount_ht1TargetAtPeer1);
    assertEquals("@Peer1 t2_syncup should be NOT sync up and have 100 rows", 100,
      rowCount_ht2TargetAtPeer1);

    // after syun up
    for (int i = 0; i < NB_RETRIES; i++) {
      syncUp(utility1);
      rowCount_ht1TargetAtPeer1 = utility2.countRows(ht1TargetAtPeer1);
      rowCount_ht2TargetAtPeer1 = utility2.countRows(ht2TargetAtPeer1);
      if (i == NB_RETRIES - 1) {
        if (rowCount_ht1TargetAtPeer1 != 100 || rowCount_ht2TargetAtPeer1 != 200) {
          // syncUP still failed. Let's look at the source in case anything wrong there
          utility1.restartHBaseCluster(1);
          rowCount_ht1Source = utility1.countRows(ht1Source);
          LOG.debug("t1_syncup should have 102 rows at source, and it is " + rowCount_ht1Source);
          rowCount_ht2Source = utility1.countRows(ht2Source);
          LOG.debug("t2_syncup should have 202 rows at source, and it is " + rowCount_ht2Source);
        }
        assertEquals("@Peer1 t1_syncup should be sync up and have 100 rows", 100,
          rowCount_ht1TargetAtPeer1);
        assertEquals("@Peer1 t2_syncup should be sync up and have 200 rows", 200,
          rowCount_ht2TargetAtPeer1);
      }
      if (rowCount_ht1TargetAtPeer1 == 100 && rowCount_ht2TargetAtPeer1 == 200) {
        LOG.info("SyncUpAfterPut succeeded at retry = " + i);
        break;
      } else {
        LOG.debug("SyncUpAfterPut failed at retry = " + i + ", with rowCount_ht1TargetPeer1 ="
            + rowCount_ht1TargetAtPeer1 + " and rowCount_ht2TargetAtPeer1 ="
            + rowCount_ht2TargetAtPeer1);
      }
      Thread.sleep(SLEEP_TIME);
    }
  }

  protected void syncUp(HBaseTestingUtility ut) throws Exception {
    ToolRunner.run(ut.getConfiguration(), new ReplicationSyncUp(), new String[0]);
  }
}