From: | Andreas Pflug <pgadmin(at)pse-consulting(dot)de> |
---|---|
To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: XLogArchivingActive |
Date: | 2006-05-26 10:38:32 |
Message-ID: | 4476DAA8.20103@pse-consulting.de |
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Thread: | |
Lists: | pgsql-hackers |
Simon Riggs wrote:
> On Thu, 2006-05-25 at 17:25 +0200, Andreas Pflug wrote:
>
>
>>Currently, I have to
>>edit postgresql.conf and SIGHUP to "turn on archiving" configuring a
>>(hopefully) writable directory, do the backup, edit postgresql.conf and
>>SIGHUP again. Not too convenient...
>
>
> You're doing this for pgAdmin right?
Not yet, just trying to manage a server.
>
> My understanding was that we had the tools now to edit the
> postgresql.conf programmatically?
>
> Seems like its not too convenient to change the way the server operates
> to do this, as long as we solve the SIGHUP/postgresql.conf problem. I'm
> also not that happy about curtailing people's options on backup either:
> if people decided they wanted to have a mixture of isolated on-line
> backup (as you suggest), plus active archiving at other times they would
> still have the problems you suggest.
Why?
My suggestion is to redefine XLogArchivingActive. Currently, it tests
for non-null archive_command. I propose
bool XlogArchivingActive()
{
if (XLogArchiveCommand[0] == 0)
return false;
return (XLogPermanentArchive // from GUC
|| OnlineBackupRunning()); // from pg_start_backup
}
The people you mention simply have XLogPermanentActive=true in
postgresql.conf, delivering the current behaviour.
>
> Not sure what the edit commands are offhand, but we would need the
> following program:
>
> - edit postgresql.conf
> - pg_reload_conf()
> - wait 30
> - pg_start_backup('blah')
> - backup
> - pg_stop_backup()
> - unedit postgresql.conf
> - pg_reload_conf()
>
> Which could then be wrapped even more simply as
>
> - pg_start_backup_online('blah')
> - backup
> - pg_stop_backup_online()
Editing postgresql.conf for this is ugly. In addition,
pg_start_backup_online would need an additional parameter, the (highly
machine specific) archive_command string. I'd like to see that parameter
untouched in postgresql.conf.
Regards,
Andreas
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