| From: | Julien Rouhaud <rjuju123(at)gmail(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Michael Paquier <michael(at)paquier(dot)xyz>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, a(dot)zakirov(at)postgrespro(dot)ru, Antonin Houska <ah(at)cybertec(dot)at>, Magnus Hagander <magnus(at)hagander(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: shared-memory based stats collector |
| Date: | 2020-03-10 18:52:22 |
| Message-ID: | CAOBaU_Y5jq43kjkkEx1ybzxo2c7rQfDTmwzwVw0UkqN-JUO4hA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Mar 10, 2020 at 1:48 PM Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> wrote:
>
> On 2020-Mar-10, Kyotaro Horiguchi wrote:
>
> > At Mon, 9 Mar 2020 20:34:20 -0700, Andres Freund <andres(at)anarazel(dot)de> wrote in
> > > On 2020-03-10 12:27:25 +0900, Kyotaro Horiguchi wrote:
> > > > That's true, but I have the same concern with Tom. The archive bacame
> > > > too-tightly linked with other processes than actual relation.
> > >
> > > What's the problem here? We have a number of helper processes
> > > (checkpointer, bgwriter) that are attached to shared memory, and it's
> > > not a problem.
> >
> > That theoretically raises the chance of server-crash by a small amount
> > of probability. But, yes, it's absurd to prmise that archiver process
> > crashes.
>
> The case I'm worried about is a misconfigured archive_command that
> causes the archiver to misbehave (exit with a code other than 0); if
> that already doesn't happen, or we can make it not happen, then I'm okay
> with the changes to archiver.
Any script that gets killed, or that exit with a return code > 127
would do that.
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