def delete(self, cf_name, key, columns=None):
    try:
        self._cassandra_driver.remove(key, columns, cf_name=cf_name)
        return True
    except Exception as e:
        self._logger('VNCCassandra, unable to del {}={}, error: {}'.format(key, columns, e), level=SandeshLevel.SYS_WARN)
        return False
def delete(self, cf_name, key, columns=None):
    try:
        self._cassandra_driver.remove(key, columns, cf_name=cf_name)
        return True
    except Exception as e:
        self._logger('VNCCassandra, unable to del {}={}, error: {}'.format(key, columns, e), level=SandeshLevel.SYS_WARN)
        return False