From: | Stephen Frost <sfrost(at)snowman(dot)net> |
---|---|
To: | Michael Paquier <michael(at)paquier(dot)xyz> |
Cc: | splarv(at)ya(dot)ru, pgsql-docs(at)lists(dot)postgresql(dot)org |
Subject: | Re: Return codes for archive and restore commands |
Date: | 2018-11-29 03:27:31 |
Message-ID: | 20181129032731.GV3415@tamriel.snowman.net |
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Lists: | pgsql-docs |
Greetings,
* Michael Paquier (michael(at)paquier(dot)xyz) wrote:
> On Wed, Nov 28, 2018 at 09:39:58PM -0500, Stephen Frost wrote:
> > Having discussed this quite a bit lately with David Steele and Magnus,
> > it's pretty clear that we need to completely rip out how this works
> > today and rewrite it based around an extension model where a background
> > worker can start up and essentially take the place of the archiver
> > process, with flexibility to jump forward through the WAL stream,
> > communicate clearly with other processes, handle failure to do so
> > gracefully based on the specific cases, etc.
>
> Hm. When an instance state is in PM_SHUTDOWN_2, the postmaster
> explicitely waits for the WAL senders and the archiver to shut down. So
> I think that you would need more control regarding the timing a bgworker
> should be shut down first to be completely correct.
Yes, it couldn't be exactly the same as a generic background worker,
that's a good point. We definitely need to make sure that the
postmaster waits for the archiver to shut down, as it does for the WAL
senders.
Thanks!
Stephen
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