create_if_not_exists 参数感觉可以删除掉，目前代码中并没有相关的判断，目录总是创建的。

[gcxfd]

[GanZiheng]

是的，和 read_only 是重复的，可以考虑删掉 create_if_not_exists。

[zhangjinpeng87]

Please use english since this is a global community. Thanks.

[BusyJay]

create_if_not_exists doesn't need to be read only. Users can always use write mode and do assertion on existence.