create the replica according to the replica_method
            defined by the user.  this is a list, so we need to
            loop through all methods the user supplies

def create_replica(self, clone_member):
        """
            create the replica according to the replica_method
            defined by the user.  this is a list, so we need to
            loop through all methods the user supplies
        """

        self.set_state('creating replica')
        self._sysid = None

        is_remote_master = isinstance(clone_member, RemoteMember)
        create_replica_methods = is_remote_master and clone_member.create_replica_methods

        # get list of replica methods either from clone member or from
        # the config. If there is no configuration key, or no value is
        # specified, use basebackup
        replica_methods = (
            create_replica_methods
            or self._create_replica_methods
            or ['basebackup']
        )

        if clone_member and clone_member.conn_url:
            r = clone_member.conn_kwargs(self._replication)
            connstring = 'postgres://{user}@{host}:{port}/{database}'.format(**r)
            # add the credentials to connect to the replica origin to pgpass.
            env = self.write_pgpass(r)
        else:
            connstring = ''
            env = os.environ.copy()
            # if we don't have any source, leave only replica methods that work without it
            replica_methods = \
                [r for r in replica_methods if self.replica_method_can_work_without_replication_connection(r)]

        # go through them in priority order
        ret = 1
        for replica_method in replica_methods:
            with self._cancellable_lock:
                if self._is_cancelled:
                    break
            # if the method is basebackup, then use the built-in
            if replica_method == "basebackup":
                ret = self.basebackup(connstring, env, self.config.get(replica_method, {}))
                if ret == 0:
                    logger.info("replica has been created using basebackup")
                    # if basebackup succeeds, exit with success
                    break
            else:
                if not self.data_directory_empty():
                    if self.config.get(replica_method, {}).get('keep_data', False):
                        logger.info('Leaving data directory uncleaned')
                    else:
                        self.remove_data_directory()

                cmd = replica_method
                method_config = {}
                # user-defined method; check for configuration
                # not required, actually
                if self.config.get(replica_method, {}):
                    method_config = self.config[replica_method].copy()
                    # look to see if the user has supplied a full command path
                    # if not, use the method name as the command
                    cmd = method_config.pop('command', cmd)

                # add the default parameters
                if not method_config.get('no_params', False):
                    method_config.update({"scope": self.scope,
                                          "role": "replica",
                                          "datadir": self._data_dir,
                                          "connstring": connstring})
                else:
                    for param in ('no_params', 'no_master', 'keep_data'):
                        method_config.pop(param, None)
                params = ["--{0}={1}".format(arg, val) for arg, val in method_config.items()]
                try:
                    # call script with the full set of parameters
                    ret = self.cancellable_subprocess_call(shlex.split(cmd) + params, env=env)
                    # if we succeeded, stop
                    if ret == 0:
                        logger.info('replica has been created using %s', replica_method)
                        break
                    else:
                        logger.error('Error creating replica using method %s: %s exited with code=%s',
                                     replica_method, cmd, ret)
                except Exception:
                    logger.exception('Error creating replica using method %s', replica_method)
                    ret = 1

        self.set_state('stopped')
        return ret