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    * Copyright 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
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  package org.apache.hadoop.hbase.replication;
  
  import static org.junit.Assert.assertArrayEquals;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.List;
  import java.util.concurrent.CountDownLatch;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.hbase.*;
  import org.apache.hadoop.hbase.client.Delete;
  import org.apache.hadoop.hbase.client.Get;
  import org.apache.hadoop.hbase.client.Admin;
  import org.apache.hadoop.hbase.client.HBaseAdmin;
  import org.apache.hadoop.hbase.client.HTable;
  import org.apache.hadoop.hbase.client.Put;
  import org.apache.hadoop.hbase.client.Result;
  import org.apache.hadoop.hbase.client.Table;
  import org.apache.hadoop.hbase.client.replication.ReplicationAdmin;
  import org.apache.hadoop.hbase.coprocessor.CoprocessorHost;
  import org.apache.hadoop.hbase.master.cleaner.ReplicationZKLockCleanerChore;
  import org.apache.hadoop.hbase.regionserver.HRegion;
  import org.apache.hadoop.hbase.regionserver.HRegionServer;
  import org.apache.hadoop.hbase.regionserver.wal.WALActionsListener;
  import org.apache.hadoop.hbase.testclassification.LargeTests;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.apache.hadoop.hbase.zookeeper.MiniZooKeeperCluster;
  import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
  import org.junit.AfterClass;
  import org.junit.BeforeClass;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  @Category(LargeTests.class)
  public class TestMultiSlaveReplication {
  
    private static final Log LOG = LogFactory.getLog(TestReplicationBase.class);
  
    private static Configuration conf1;
    private static Configuration conf2;
    private static Configuration conf3;
  
    private static HBaseTestingUtility utility1;
    private static HBaseTestingUtility utility2;
    private static HBaseTestingUtility utility3;
    private static final long SLEEP_TIME = 500;
    private static final int NB_RETRIES = 100;
  
    private static final TableName tableName = TableName.valueOf("test");
    private static final byte[] famName = Bytes.toBytes("f");
    private static final byte[] row = Bytes.toBytes("row");
    private static final byte[] row1 = Bytes.toBytes("row1");
    private static final byte[] row2 = Bytes.toBytes("row2");
    private static final byte[] row3 = Bytes.toBytes("row3");
    private static final byte[] noRepfamName = Bytes.toBytes("norep");
  
    private static HTableDescriptor table;
  
    @BeforeClass
    public static void setUpBeforeClass() throws Exception {
      conf1 = HBaseConfiguration.create();
      conf1.set(HConstants.ZOOKEEPER_ZNODE_PARENT, "/1");
      // smaller block size and capacity to trigger more operations
      // and test them
      conf1.setInt("hbase.regionserver.hlog.blocksize", 1024*20);
      conf1.setInt("replication.source.size.capacity", 1024);
      conf1.setLong("replication.source.sleepforretries", 100);
      conf1.setInt("hbase.regionserver.maxlogs", 10);
      conf1.setLong("hbase.master.logcleaner.ttl", 10);
      conf1.setBoolean(HConstants.REPLICATION_ENABLE_KEY, HConstants.REPLICATION_ENABLE_DEFAULT);
      conf1.setBoolean("dfs.support.append", true);
     conf1.setLong(HConstants.THREAD_WAKE_FREQUENCY, 100);
     conf1.setStrings(CoprocessorHost.USER_REGION_COPROCESSOR_CONF_KEY,
         "org.apache.hadoop.hbase.replication.TestMasterReplication$CoprocessorCounter");
     conf1.setBoolean(HConstants.ZOOKEEPER_USEMULTI , false);// for testZKLockCleaner
     conf1.setInt("hbase.master.cleaner.interval", 5 * 1000);
     conf1.setClass("hbase.region.replica.replication.replicationQueues.class",
         ReplicationQueuesZKImpl.class, ReplicationQueues.class);
     conf1.setLong(ReplicationZKLockCleanerChore.TTL_CONFIG_KEY, 0L);
 
     utility1 = new HBaseTestingUtility(conf1);
     utility1.startMiniZKCluster();
     MiniZooKeeperCluster miniZK = utility1.getZkCluster();
     utility1.setZkCluster(miniZK);
     new ZooKeeperWatcher(conf1, "cluster1", null, true);
 
     conf2 = new Configuration(conf1);
     conf2.set(HConstants.ZOOKEEPER_ZNODE_PARENT, "/2");
 
     conf3 = new Configuration(conf1);
     conf3.set(HConstants.ZOOKEEPER_ZNODE_PARENT, "/3");
 
     utility2 = new HBaseTestingUtility(conf2);
     utility2.setZkCluster(miniZK);
     new ZooKeeperWatcher(conf2, "cluster2", null, true);
 
     utility3 = new HBaseTestingUtility(conf3);
     utility3.setZkCluster(miniZK);
     new ZooKeeperWatcher(conf3, "cluster3", null, true);
 
     table = new HTableDescriptor(tableName);
     HColumnDescriptor fam = new HColumnDescriptor(famName);
     fam.setScope(HConstants.REPLICATION_SCOPE_GLOBAL);
     table.addFamily(fam);
     fam = new HColumnDescriptor(noRepfamName);
     table.addFamily(fam);
   }
 
   @Test(timeout=300000)
   public void testMultiSlaveReplication() throws Exception {
     LOG.info("testCyclicReplication");
     MiniHBaseCluster master = utility1.startMiniCluster();
     utility2.startMiniCluster();
     utility3.startMiniCluster();
     ReplicationAdmin admin1 = new ReplicationAdmin(conf1);
 
     new HBaseAdmin(conf1).createTable(table);
     new HBaseAdmin(conf2).createTable(table);
     new HBaseAdmin(conf3).createTable(table);
     Table htable1 = new HTable(conf1, tableName);
     htable1.setWriteBufferSize(1024);
     Table htable2 = new HTable(conf2, tableName);
     htable2.setWriteBufferSize(1024);
     Table htable3 = new HTable(conf3, tableName);
     htable3.setWriteBufferSize(1024);
 
     admin1.addPeer("1", utility2.getClusterKey());
 
     // put "row" and wait 'til it got around, then delete
     putAndWait(row, famName, htable1, htable2);
     deleteAndWait(row, htable1, htable2);
     // check it wasn't replication to cluster 3
     checkRow(row,0,htable3);
 
     putAndWait(row2, famName, htable1, htable2);
 
     // now roll the region server's logs
     rollWALAndWait(utility1, htable1.getName(), row2);
 
     // after the log was rolled put a new row
     putAndWait(row3, famName, htable1, htable2);
 
     admin1.addPeer("2", utility3.getClusterKey());
 
     // put a row, check it was replicated to all clusters
     putAndWait(row1, famName, htable1, htable2, htable3);
     // delete and verify
     deleteAndWait(row1, htable1, htable2, htable3);
 
     // make sure row2 did not get replicated after
     // cluster 3 was added
     checkRow(row2,0,htable3);
 
     // row3 will get replicated, because it was in the
     // latest log
     checkRow(row3,1,htable3);
 
     Put p = new Put(row);
     p.add(famName, row, row);
     htable1.put(p);
     // now roll the logs again
     rollWALAndWait(utility1, htable1.getName(), row);
 
     // cleanup "row2", also conveniently use this to wait replication
     // to finish
     deleteAndWait(row2, htable1, htable2, htable3);
     // Even if the log was rolled in the middle of the replication
     // "row" is still replication.
     checkRow(row, 1, htable2);
     // Replication thread of cluster 2 may be sleeping, and since row2 is not there in it,
     // we should wait before checking.
     checkWithWait(row, 1, htable3);
 
     // cleanup the rest
     deleteAndWait(row, htable1, htable2, htable3);
     deleteAndWait(row3, htable1, htable2, htable3);
 
     utility3.shutdownMiniCluster();
     utility2.shutdownMiniCluster();
     utility1.shutdownMiniCluster();
   }
 
   @Test
   public void testZKLockCleaner() throws Exception {
     MiniHBaseCluster cluster = utility1.startMiniCluster(1, 2);
     HTableDescriptor table = new HTableDescriptor(TableName.valueOf(Bytes.toBytes("zk")));
     HColumnDescriptor fam = new HColumnDescriptor(famName);
     fam.setScope(HConstants.REPLICATION_SCOPE_GLOBAL);
     table.addFamily(fam);
     new HBaseAdmin(conf1).createTable(table);
     ReplicationAdmin replicationAdmin = new ReplicationAdmin(conf1);
     ReplicationPeerConfig rpc = new ReplicationPeerConfig();
     rpc.setClusterKey(utility2.getClusterKey());
     replicationAdmin.addPeer("cluster2", rpc, null);
     HRegionServer rs = cluster.getRegionServer(0);
     ReplicationQueuesZKImpl zk = new ReplicationQueuesZKImpl(rs.getZooKeeper(), conf1, rs);
     zk.init(rs.getServerName().toString());
     List<String> replicators = zk.getListOfReplicators();
     assertEquals(2, replicators.size());
     String zNode = cluster.getRegionServer(1).getServerName().toString();
 
     assertTrue(zk.lockOtherRS(zNode));
     assertTrue(zk.checkLockExists(zNode));
     Thread.sleep(10000);
     assertTrue(zk.checkLockExists(zNode));
     cluster.abortRegionServer(0);
     Thread.sleep(10000);
     HRegionServer rs1 = cluster.getRegionServer(1);
     zk = new ReplicationQueuesZKImpl(rs1.getZooKeeper(), conf1, rs1);
     zk.init(rs1.getServerName().toString());
     assertFalse(zk.checkLockExists(zNode));
 
     utility1.shutdownMiniCluster();
   }
 
   private void rollWALAndWait(final HBaseTestingUtility utility, final TableName table,
       final byte[] row) throws IOException {
     final Admin admin = utility.getHBaseAdmin();
     final MiniHBaseCluster cluster = utility.getMiniHBaseCluster();
 
     // find the region that corresponds to the given row.
     HRegion region = null;
     for (HRegion candidate : cluster.getRegions(table)) {
       if (HRegion.rowIsInRange(candidate.getRegionInfo(), row)) {
         region = candidate;
         break;
       }
     }
     assertNotNull("Couldn't find the region for row '" + Arrays.toString(row) + "'", region);
 
     final CountDownLatch latch = new CountDownLatch(1);
 
     // listen for successful log rolls
     final WALActionsListener listener = new WALActionsListener.Base() {
           @Override
           public void postLogRoll(final Path oldPath, final Path newPath) throws IOException {
             latch.countDown();
           }
         };
     region.getWAL().registerWALActionsListener(listener);
 
     // request a roll
     admin.rollWALWriter(cluster.getServerHoldingRegion(region.getTableDesc().getTableName(),
       region.getRegionInfo().getRegionName()));
 
     // wait
     try {
       latch.await();
     } catch (InterruptedException exception) {
       LOG.warn("Interrupted while waiting for the wal of '" + region + "' to roll. If later " +
           "replication tests fail, it's probably because we should still be waiting.");
       Thread.currentThread().interrupt();
     }
     region.getWAL().unregisterWALActionsListener(listener);
   }
 
  
   private void checkWithWait(byte[] row, int count, Table table) throws Exception {
     Get get = new Get(row);
     for (int i = 0; i < NB_RETRIES; i++) {
       if (i == NB_RETRIES - 1) {
         fail("Waited too much time while getting the row.");
       }
       boolean rowReplicated = false;
       Result res = table.get(get);
       if (res.size() >= 1) {
         LOG.info("Row is replicated");
         rowReplicated = true;
         assertEquals("Table '" + table + "' did not have the expected number of  results.",
             count, res.size());
         break;
       }
       if (rowReplicated) {
         break;
       } else {
         Thread.sleep(SLEEP_TIME);
       }
     }
   }
 
   private void checkRow(byte[] row, int count, Table... tables) throws IOException {
     Get get = new Get(row);
     for (Table table : tables) {
       Result res = table.get(get);
       assertEquals("Table '" + table + "' did not have the expected number of results.",
           count, res.size());
     }
   }
 
   private void deleteAndWait(byte[] row, Table source, Table... targets)
   throws Exception {
     Delete del = new Delete(row);
     source.delete(del);
 
     Get get = new Get(row);
     for (int i = 0; i < NB_RETRIES; i++) {
       if (i==NB_RETRIES-1) {
         fail("Waited too much time for del replication");
       }
       boolean removedFromAll = true;
       for (Table target : targets) {
         Result res = target.get(get);
         if (res.size() >= 1) {
           LOG.info("Row not deleted");
           removedFromAll = false;
           break;
         }
       }
       if (removedFromAll) {
         break;
       } else {
         Thread.sleep(SLEEP_TIME);
       }
     }
   }
 
   private void putAndWait(byte[] row, byte[] fam, Table source, Table... targets)
   throws Exception {
     Put put = new Put(row);
     put.add(fam, row, row);
     source.put(put);
 
     Get get = new Get(row);
     for (int i = 0; i < NB_RETRIES; i++) {
       if (i==NB_RETRIES-1) {
         fail("Waited too much time for put replication");
       }
       boolean replicatedToAll = true;
       for (Table target : targets) {
         Result res = target.get(get);
         if (res.size() == 0) {
           LOG.info("Row not available");
           replicatedToAll = false;
           break;
         } else {
           assertArrayEquals(res.value(), row);
         }
       }
       if (replicatedToAll) {
         break;
       } else {
         Thread.sleep(SLEEP_TIME);
       }
     }
   }
 
 }