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    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
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   *     http://www.apache.org/licenses/LICENSE-2.0
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   * Unless required by applicable law or agreed to in writing, software
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  package org.apache.hadoop.hbase.replication;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.hbase.HBaseTestingUtility;
  import org.apache.hadoop.hbase.Waiter;
  import org.apache.hadoop.hbase.regionserver.HRegionServer;
  import org.apache.hadoop.hbase.replication.regionserver.Replication;
  import org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceManager;
  import org.apache.hadoop.hbase.testclassification.MediumTests;
  import org.apache.hadoop.hbase.util.Threads;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  @Category(MediumTests.class)
  public class TestReplicationConfigTracker extends TestReplicationBase {
    private static final Log LOG = LogFactory.getLog(TestReplicationKillRS.class);
  
    @Test
    public void testReplicationConfigTracker() throws Exception {
      // killing the RS with hbase:meta can result into failed puts until we solve
      // IO fencing
      int rsToKill1 = utility1.getHBaseCluster().getServerWithMeta() == 0 ? 1 : 0;
      int otherRs = rsToKill1 == 0 ? 1 : 0;
      final HRegionServer regionServer = utility1.getHBaseCluster().getRegionServer(otherRs);
      final Thread listenerTracker = trackListener(utility1, otherRs);
      LOG.info("Start loading table");
      utility1.loadTable(htable1, famName, true);
      LOG.info("Done loading table");
      utility1.getHBaseCluster().getRegionServer(rsToKill1).abort("Stopping as part of the test");
      utility1.getHBaseCluster().waitOnRegionServer(rsToKill1);
      while (utility1.getHBaseCluster().getMaster().getServerManager().areDeadServersInProgress()) {
        LOG.info("Waiting on processing of crashed server before proceeding...");
        Threads.sleep(1000);
      }
      Waiter.waitFor(utility1.getConfiguration(), 20000, new Waiter.Predicate<Exception>() {
        @Override public boolean evaluate() throws Exception {
          return !listenerTracker.isAlive();
        }
      });
      final ReplicationPeerZKImpl.PeerConfigTracker tracker = getPeerConfigTracker(regionServer);
      Waiter.waitFor(utility1.getConfiguration(), 20000, new Waiter.Predicate<Exception>() {
        @Override public boolean evaluate() throws Exception {
          return tracker.getListeners().size() == 1;
        }
      });
    }
  
    private static Thread trackListener(final HBaseTestingUtility utility, final int rs) {
      Thread trackListener = new Thread() {
        public void run() {
          Replication replication = (Replication) utility.getHBaseCluster().getRegionServer(rs)
              .getReplicationSourceService();
          ReplicationSourceManager manager = replication.getReplicationManager();
          ReplicationPeerZKImpl replicationPeerZK =
              (ReplicationPeerZKImpl) manager.getReplicationPeers().getPeer(PEER_ID);
          ReplicationPeerZKImpl.PeerConfigTracker peerConfigTracker =
              replicationPeerZK.getPeerConfigTracker();
          while (peerConfigTracker.getListeners().size() != 2) {
            try {
              Thread.sleep(50);
            } catch (InterruptedException e) {
              LOG.error("track config failed", e);
            }
          }
        }
      };
      trackListener.setDaemon(true);
      trackListener.start();
      return trackListener;
    }
  
    private ReplicationPeerZKImpl.PeerConfigTracker getPeerConfigTracker(HRegionServer rs) {
      Replication replication = (Replication) rs.getReplicationSourceService();
      ReplicationSourceManager manager = replication.getReplicationManager();
      ReplicationPeerZKImpl replicationPeerZK =
          (ReplicationPeerZKImpl) manager.getReplicationPeers().getPeer(PEER_ID);
      ReplicationPeerZKImpl.PeerConfigTracker peerConfigTracker =
          replicationPeerZK.getPeerConfigTracker();
      return peerConfigTracker;
    }
 }