@Override
  public IsBalancerEnabledResponse isBalancerEnabled(RpcController controller,
    IsBalancerEnabledRequest request) throws ServiceException {
    IsBalancerEnabledResponse.Builder response = IsBalancerEnabledResponse.newBuilder();
    response.setEnabled(server.isBalancerOn());
    return response.build();
  }
Triggers an asynchronous attempt to take a snapshot. {@inheritDoc}
hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java