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Re: somewhat wrong archive_command example

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Magnus Hagander <magnus(at)hagander(dot)net>
Cc: Peter Eisentraut <peter_e(at)gmx(dot)net>,Josh Kupershmidt <schmiddy(at)gmail(dot)com>,Greg Smith <greg(at)2ndquadrant(dot)com>,Euler Taveira de Oliveira <euler(at)timbira(dot)com>,pgsql-docs(at)postgresql(dot)org
Subject: Re: somewhat wrong archive_command example
Date: 2012-08-30 13:11:01
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Lists: pgsql-docs
On Thu, Aug 30, 2012 at 11:15:30AM +0200, Magnus Hagander wrote:
> On Thu, Aug 30, 2012 at 3:57 AM, Peter Eisentraut <peter_e(at)gmx(dot)net> wrote:
> > On Mon, 2012-08-27 at 09:46 -0400, Bruce Momjian wrote:
> >> I thought the idea was just to show what a shell script might look like
> >> --- we could say it does the same as a single-line copy, but then people
> >> could improve it, or we could add a comment to show how people could
> >> improve it.
> >
> > Why can't we provide the improved version to begin with, if we know it
> > needs improvement?  I think we don't really know what it should look
> > like, do we?
> +1.
> >> > I think what we should do is write a wrapper program in C that covers
> >> > all the bases, support all platforms, and supports a handful of the most
> >> > commonly used copy methods (cp, scp, etc. + compression).  Then everyone
> >> > can just use that and doesn't have to figure all these things out from
> >> > scratch every time.
> >>
> >> I doubt it would work because people like the flexibility of shell
> >> scripts.
> >
> > Well, we thought that about the base backup, but now we have
> > pg_basebackup, which supports two output methods that should cover most
> > cases.  If we could provide an archive command that has two or three
> > methods, that could also cover most uses.  Of course, in either case you
> > are free to write your own script.
> I would say the majority of people *don't* like the flexibility of
> shellscripts. They want something simple to use. pg_receivexlog on 9.2
> is going to help some of them (as a completement to pg_basebackup).
> But also shipping something to use for archive_command that just
> copies the files in a proper way would definitely help for usability.
> As long as we keep the write-your-own-script-however-you-like method,
> just like we did for pg_basebackup, doing this can only be an
> improvement. And I don't see anybody suggesting we *remove* this
> capability.

The original idea for the shell script was just to show people an
example of what it might look like --- not to try to fix or change our
recommended behavior.  If there is no interest in showing an example, we
can just close this thread.

  Bruce Momjian  <bruce(at)momjian(dot)us>

  + It's impossible for everything to be true. +

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