Re: Renaming of pg_xlog and pg_clog

On Thu, Mar 16, 2017 at 9:31 PM, Michael Paquier
<michael(dot)paquier(at)gmail(dot)com> wrote:
> On Fri, Mar 17, 2017 at 12:19 AM, David Steele <david(at)pgmasters(dot)net> wrote:
>> This patch does not apply cleanly at cccbdde:
>>
>> $ git apply ../other/0001-Rename-pg_clog-to-pg_xact.patch
>> error: doc/src/sgml/ref/pg_resetxlog.sgml: No such file or directory
>> error: patch failed: src/backend/postmaster/autovacuum.c:2468
>> error: src/backend/postmaster/autovacuum.c: patch does not apply
>
> This has rotten again...
>
>> Marked "Waiting on Author".
>>
>> I'd really like to see the rest of the renames happen for v10. It seems
>> like the process got stalled after the pg_wal rename.
>
> Let's see what happens, attached are refreshed versions. Uncertainty
> is the fun part of a CF.

I understand that the point of renaming pg_clog to pg_xact is that
pg_clog contains the dreaded letters l-o-g, which we hypothesize
causes DBAs to remove it. (Alternate hypothesis: "So, that's what's
clogging my database!")

Renaming pg_subtrans to pg_subxact has no such redeeming properties.

More, with each of these renamings, we're further separating what
things are called in the code (xlog, clog, subtrans) with what they're
called in the filesystem (wal, xact, subxact).

So if we must rename pg_clog, OK, but can't we leave pg_subtrans
alone? It's not hurting anybody.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company