@Override
  public List<String> listPeerIds() throws ReplicationException {
    try {
      List<String> children = ZKUtil.listChildrenNoWatch(zookeeper, peersZNode);
      return children != null ? children : Collections.emptyList();
    } catch (KeeperException e) {
      throw new ReplicationException("Cannot get the list of peers", e);
    }
  }
The name of the znode that contains a list of all remote slave (i.e. peer) clusters.
hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ZKReplicationPeerStorage.java