| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org, pgsql-release(at)postgresql(dot)org, Noah Misch <noah(at)leadboat(dot)com>, pgsql-committers(at)lists(dot)postgresql(dot)org |
| Subject: | Re: pgsql: Avoid race in RelationBuildDesc() affecting CREATE INDEX CONCURR |
| Date: | 2022-02-09 01:53:59 |
| Message-ID: | 20220209015359.wvstb5rxzj53zrtp@alap3.anarazel.de |
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| Lists: | pgsql-committers pgsql-hackers |
Hi,
On 2022-02-09 02:25:09 +0100, Tomas Vondra wrote:
> AFAICS this only affects builds with CLOBBER_CACHE_ALWAYS, and anyone
> running such build in production clearly likes painful things anyway.
Yea, realistically nobody does that.
> But really, for the infinite loop to happen, building a relation descriptor
> has to invalidate a cache. And I haven't found a way to do that without the
> CLOBBER_CACHE_ALWAYS thing.
Phew.
> Also, all the November minor releases include this commit, and there were no
> reports about this (pretty obvious) issue. Buildfarm did not complain either
> (but an animal may be stuck for months and we would not know about it).
Ah, somehow I thought that wasn't yet in the last set of releases. Phew #2.
Greetings,
Andres Freund
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