Thank you for your comments.
> create a wiki account then ask for write access & we'll set you up
I created a wiki account. (https://wiki.apache.org/hadoop/AkiraAjisaka)
Would you set up for write access?
>> 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've seen it, but I don't have any solution now.
I'll try to find.