Re: Pluggable cumulative statistics

From: Andres Freund <andres(at)anarazel(dot)de>
To: Michael Paquier <michael(at)paquier(dot)xyz>
Cc: Postgres hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: Pluggable cumulative statistics
Date: 2024-07-04 21:00:47
Message-ID: 20240704210047.777c4g6cylkwe5kw@alap3.anarazel.de
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Hi,

On 2024-06-13 16:59:50 +0900, Michael Paquier wrote:
> * Making custom stats data persistent is an interesting problem, and
> there are a couple of approaches I've considered:
> ** Allow custom kinds to define callbacks to read and write data from
> a source they'd want, like their own file through a fd. This has the
> disadvantage to remove the benefit of c) above.

I am *strongly* against this. That'll make it much harder to do stuff like not
resetting stats after crashes and just generally will make it harder to
improve the stats facility further.

I think that pluggable users of the stats facility should only have control
over how data is stored via quite generic means.

Greetings,

Andres Freund

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