@Override
  public void setPeerState(String peerId, boolean enabled) throws ReplicationException {
    byte[] stateBytes = enabled ? ENABLED_ZNODE_BYTES : DISABLED_ZNODE_BYTES;
    try {
      ZKUtil.setData(zookeeper, getPeerStateNode(peerId), stateBytes);
    } catch (KeeperException e) {
      throw new ReplicationException("Unable to change state of the peer with id=" + peerId, 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