> Now I know HADOOP-9346 and HADOOP-9440 for enabling protobuf 2.5.0, but
> these issues have been left for months.
Have you seen the reason why these issues have not been fixed; see -
If you have a solution for that issue, I am glad to commit that patch.
> I tried to edit wiki but it seems that I don't have the permission.
> How can I edit?
Steve already answered this.