def _get_from_riak(self, key):
obj = self.bucket.get(key)<EOL>if obj.exists:<EOL><INDENT>return obj.data, obj.key<EOL><DEDENT>raise ObjectDoesNotExist("<STR_LIT>" % (key, self.compiled_query))<EOL>
Args:
    key (str): riak key
Returns:
    (tuple): riak obj json data and riak key