| From: | Michael Paquier <michael(at)paquier(dot)xyz> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com> |
| Subject: | Re: Speedup of relation deletes during recovery |
| Date: | 2018-06-21 05:40:58 |
| Message-ID: | 20180621054058.GF1679@paquier.xyz |
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| Lists: | pgsql-hackers |
On Wed, Jun 20, 2018 at 08:43:11PM -0700, Andres Freund wrote:
> On 2018-06-18 11:13:47 -0700, Andres Freund wrote:
>> We could do that - but add_to_unowned_list() is actually a bottleneck in
>> other places during recovery too. We pretty much never (outside of
>> dropping relations / databases) close opened relations during recovery -
>> which is obviously problematic since nearly all of the entries are
>> unowned. I've come to the conclusion that we should have a global
>> variable that just disables adding anything to the global lists.
>
> On second thought: I think we should your approach in the back branches,
> and something like I'm suggesting in master once open.
+1. Let's also make sure that the removal of smgrdounlink and
smgrdounlinkfork happens only on master.
--
Michael
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