@Override
  public void setPeerNewSyncReplicationState(String peerId, SyncReplicationState state)
    throws ReplicationException {
    try {
      ZKUtil.createSetData(zookeeper, getNewSyncReplicationStateNode(peerId),
        SyncReplicationState.toByteArray(state));
    } catch (KeeperException e) {
      throw new ReplicationException(
        "Unable to set the new sync replication state for 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