Re: For what should pg_stop_backup wait?

On Thu, 2008-08-07 at 21:11 +0900, Fujii Masao wrote:

> In HEAD, pg_stop_backup waits until the history file has been archived.
> But, in order to ensure that the last wal file was archived, pg_stop_backup
> should wait until not only the history file but also the backup stopping wal
> file has been archived, I think.
> 
> Because the alphabetic order of the history file and the backup stopping
> wal file is not constant.

> If the backup starting wal file is the same as the stopping one (that is,
> any wal files were not switched during backup), the history file whose
> name consists of the starting one is behind the stopping one.
> Otherwise, the backup stopping wal file is behind the history file.

pg_stop_backup explicitly requests a log switch prior to writing the
history file, so this occurs in all cases. The assumption is wrong.

So yes, we should wait for stopxlogfilename, not histfilepath.

I'll do a patch. Thanks for your input.

-- Simon Riggs           www.2ndQuadrant.comPostgreSQL Training, Services and Support