@Override
  public DeleteColumnResponse deleteColumn(RpcController controller, DeleteColumnRequest req)
    throws ServiceException {
    try {
      long procId = server.deleteColumn(ProtobufUtil.toTableName(req.getTableName()),
        req.getColumnName().toByteArray(), req.getNonceGroup(), req.getNonce());
      if (procId == -1) {
        // This mean operation was not performed in server, so do not set any procId
        return DeleteColumnResponse.newBuilder().build();
      } else {
        return DeleteColumnResponse.newBuilder().setProcId(procId).build();
      }
    } catch (IOException ioe) {
      throw new ServiceException(ioe);
    }
  }
Returns list of blocking services and their security info classes that this server supports
hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java