Re: TRAP: FailedAssertion("!(TransactionIdPrecedesOrEquals

On Wed, Dec 20, 2017 at 7:46 AM, Erik Rijkers <er@xs4all.nl> wrote:
> Sorry, that was probably too terse, I should explain that a little.
>
> After initing 50 instances, I set up and run a pgbench session in the master
> session; the pgbench lines are:
>
>   init: pgbench --port=6515 --quiet --initialize --scale=1 postgres
>   run:  pgbench -M prepared -c 16 -j 8 -T 1 -P 1 -n postgres -- scale 1
>
> the other instances then catch up.  The whole takes 5 minutes or so
>
> I vary scale, duration, and number of instances.  I haven't had it fail in
> this way yet but I mostly tried with lower number of instances (up to 25 or
> so).

Hm. Are you saying that it takes at least 50 cascading instances to
see the problem you are seeing? And that you are not seeing any
problems with a lower number of cascading instances? Are you enabling
hot_standby_feedback?
-- 
Michael