| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Simon Riggs <simon(at)2ndquadrant(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: postgres_fdw vs. force_parallel_mode on ppc |
| Date: | 2016-03-04 16:22:43 |
| Message-ID: | CA+TgmoaR=NM_pHbNkUhWXcL6jppO0-kp_ztQmq+EB-fRd4HGVQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Mar 4, 2016 at 11:17 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> On Fri, Mar 4, 2016 at 11:03 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>> Well, that would make the function more complicated, but maybe it's a
>>> better answer. On the other hand, we know that the stats updates are
>>> delivered in a deterministic order, so why not simply replace the
>>> existing test in the wait function with one that looks for the truncation
>>> updates? If we've gotten those, we must have gotten the earlier ones.
>
>> I'm not sure if that's actually true with parallel mode. I'm pretty
>> sure the earlier workers will have terminated before the later ones
>> start, but is that enough to guarantee that the stats collector sees
>> the messages in that order?
>
> Huh? Parallel workers are read-only; what would they be doing sending
> any of these messages?
Mumble. I have no idea what's happening here.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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