def join(self):
        """Wait until job's completion."""
        self._future = False
        self._job.poll()
        model_key = self._job.dest_key
        self._job = None
        model_json = h2o.api("GET /%d/Models/%s" % (self._rest_version, model_key))["models"][0]
        self._resolve_model(model_key, model_json)