From: | Andres Freund <andres(at)anarazel(dot)de> |
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To: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
Cc: | Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, magnus(at)hagander(dot)net, robertmhaas(at)gmail(dot)com, tgl(at)sss(dot)pgh(dot)pa(dot)us, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: shared-memory based stats collector |
Date: | 2018-07-11 00:06:05 |
Message-ID: | 20180711000605.sqjik3vqe5opqz33@alap3.anarazel.de |
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Lists: | pgsql-hackers |
On 2018-07-10 14:52:13 +0200, Tomas Vondra wrote:
> There's one more reason why attempts to keep stats snapshots "perfectly"
> consistent are likely doomed to fail - the messages are sent over UDP, which
> does not guarantee delivery etc. So there's always some level of possible
> inconsistency even with "perfectly consistent" snapshots.
FWIW, I don't see us continuing to do so if we go for a shared hashtable
for stats.
- Andres
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