Re: BUG #15402: Hot standby server with archive_mode=on keeps initial WAL segments

Hello, Michael

> > > Though I understand renaming the .ready to .done manually can clean it,
> > > I would like to fix the server code like the following patch.
> > > I'd appreciate if you would consider that.
> > 
> > Your patch looks incorrect to me to begin with...  What if archive_mode
> > is switched from "on" to "always" back-and-forth and there some of the
> > past segments which should be archived are not?

I understand this scenario.
 (1) archive_mode=always and archvie_command failure 
 (2) .ready files are building up
 (3) switch to archive_mode=on
 (4) WAL segments with .ready status are swept
 (5) switch to archive_mode=always
     some WAL segments are lost.

I think is it natural that some segments are not archived when you 
switch archive_mode back-and-forth.

I also think a fix to prevent generating .ready file at hot standby
server in this case is better. I don't have a concrete idea to do so now.

Thanks,
Haruka Takatsuka