Horton

Re: Renaming of pg_xlog and pg_clog

Robert Haas <robertmhaas@gmail.com>

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From: Robert Haas <robertmhaas@gmail.com>
To: Christoph Berg <myon@debian.org>, Bruce Momjian <bruce@momjian.us>, Stephen Frost <sfrost@snowman.net>, Peter Eisentraut <peter.eisentraut@2ndquadrant.com>, Tom Lane <tgl@sss.pgh.pa.us>, Michael Paquier <michael.paquier@gmail.com>, Robert Haas <robertmhaas@gmail.com>, Thomas Munro <thomas.munro@enterprisedb.com>, Craig Ringer <craig.ringer@2ndquadrant.com>, Jim Nasby <Jim.Nasby@bluetreble.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>, Andres Freund <andres@anarazel.de>
Date: 2016-10-20T15:11:50Z
Lists: pgsql-hackers 
On Wed, Oct 19, 2016 at 7:05 AM, Christoph Berg <myon@debian.org> wrote:
> (tl;dr: rename pg_xlog yes, rename pg_resetxlog only if we have a good
> alternative.)

I'm amused by the idea of a TL;DR in parentheses at the very bottom of
the email, but maybe I'm just easily amused.

One idea would be to rename pg_resetxlog to pg_resetwal.  I think
that's actually an improvement.  The "x" in "xlog" is not a clear
abbreviation for "write-ahead", especially when we also use "x" in
other contexts to mean "transaction" - think "xid".  Given our current
practices, we could justifiably rename pg_clog to pg_xlog -- after
all, that's where we log the status of the xacts.  Ugh.

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

Commits

  1. Rename "pg_clog" directory to "pg_xact".

  2. Improve error reporting in pg_upgrade's file copying/linking/rewriting.