Re: pgstat_send_connstats() introduces unnecessary timestamp and UDP overhead

From: Andrew Dunstan <andrew(at)dunslane(dot)net>
To: Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, Andres Freund <andres(at)anarazel(dot)de>, magnus(at)hagander(dot)net
Cc: Michael Paquier <michael(at)paquier(dot)xyz>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: pgstat_send_connstats() introduces unnecessary timestamp and UDP overhead
Date: 2021-09-15 14:47:33
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On 9/8/21 12:11 AM, Laurenz Albe wrote:
> On Fri, 2021-09-03 at 17:04 -0700, Andres Freund wrote:
>> Here's how I think that would look like. While writing up this draft, I found
>> two more issues:
>> - On windows / 32 bit systems, the session time would overflow if idle for
>>   longer than ~4300s. long is only 32 bit. Easy to fix obviously.
>> - Right now walsenders, including database connected walsenders, are not
>>   reported in connection stats. That doesn't seem quite right to me.
>> In the patch I made the message for connecting an explicitly reported message,
>> that seems cleaner, because it then happens at a clearly defined point. I
>> didn't do the same for disconnecting, but perhaps that would be better? Then
>> we could get rid of the whole pgStatSessionEndCause variable.
> I have gone over your patch and made the following changes:
> - cache the last report time in a static variable pgLastSessionReportTime
> - add a comment to explain why we only track normal backends
> - pgindent
> - an attempt at a commit message


this is an open item for release 14. Is someone going to commit?



Andrew Dunstan

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