| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: shared memory based stat collector (was: Sharing record typmods between backends) |
| Date: | 2017-08-15 13:54:58 |
| Message-ID: | 26393.1502805298@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> I really, really strongly encourage you to rip the use of DSA out here
> entirely. It is reducing the reliability of a critical part of the
> system for no actual benefit other than speculation that this is going
> to be better in the future, and it adds a bunch of failure cases that
> we could just as well live without.
FWIW, I vote with Robert on this. When and if you actually want to make
that array resizable, it'd be time to introduce use of a DSA. But right
now we need to be looking for simple and reliable solutions for v10.
In particular, since right now dsm_type = NONE is still considered
supported, we can't really have autovacuum facilities that are dependent
on being able to use DSM. That might change in future, but not today.
regards, tom lane
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