Re: NOTIFY queue is at 66% and climbing...

On 10/13/21 5:50 PM, Tom Lane wrote:
> Jeff Ross <jross(at)openvistas(dot)net> writes:
>> On 10.15 I'm getting the following on a logically replicated server.
>> 2021-10-13 18:49:39.792 EDT,,,213601,,6143c257.34261,64243,,2021-09-16
>> 18:16:55 EDT,4/3914851,60709901,WARNING,01000,"NOTIFY queue is 66%
>> full",,,,,,,,,""
>> In the CSV logs above what part points to "the session that is
>> preventing cleanup" so that I can kill it?
> Normally there's a DETAIL entry citing the session's PID. Looking
> at the code, the reason for the lack of any such entry must be that
> there is no session whose current notify queue position exactly
> matches the supposed global minimum position. This corresponds to
> a known bug that was fixed in 10.16, so I'd suggest upgrading.
> As a temporary workaround you could restart that server, but
> likely the problem would recur after awhile.
>
> regards, tom lane
>
Thanks as always, Tom.  I'll schedule the upgrade to 10.18 and restart
for this weekend.

Jeff