[pgpool-hackers: 2699] [Proposal] Implementing unix_socket_directories and friends

[Tatsuo Ishii]

We have following in our TODO list:

https://pgpool.net/mediawiki/index.php/TODO#Support_multiple_UNIX_domain_socket_directories

As discussed in the URL (actually in a mail pointed by it), probably
just borrowing the idea from PostgreSQL is the best. If we are going
this direction, issues are:

1) How to migrate from socket_dir to unix_socket_directories?

I propose leaving socket_dir for 1 major release saying "we are
deprecating..." and treat it as if there's only one socket directory
in the unix_socket_directories. If unix_socket_directories is not
specified (not empty), then we take priority it over socket_dir.

2) unix_socket_group, and unix_socket_permissions

Do we want to implement them along with unix_socket_directories? My
opinion is "why not". We are going to borrow the implementation from
PostgreSQL anyway, so it would be easier to implement them along with
unix_socket_directories.

3) How to treat pcp_socket_dir?

One big question is whether we need separate pcp_socket_dir from
socket_dir at all. I think the answer is no, and we should unify it to
socket_dir and/or unix_socket_directories. Any objection?

Comments, suggestions are welcome.
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp