Re: PATCH: logical_work_mem and logical streaming of large in-progress transactions

On 2020-04-18 11:07, Erik Rijkers wrote:
>>> Hi Erik,
>>>
>>> While setting up the cascading replication I have hit one issue on
>>> base code[1]. After fixing that I have got one crash with streaming
>>> on patch. I am not sure whether you are facing any of these 2 issues
>>> or any other issue. If your issue is not any of these then plese
>>> share the callstack and steps to reproduce.
>
> I figured out a few things about this. Attached is a bash script
> test.sh, to reproduce:

And the attached file, test.sh. (sorry)

> There is a variable CRASH_IT that determines whether the whole thing
> will fail (with a segmentation fault) or not. As attached it has
> CRASH_IT=0 and does not crash. When you change that to CRASH_IT=1,
> then it will crash. It turns out that this just depends on a short
> wait state (3 seconds, on my machine) between setting up de
> replication, and the running of pgbench. It's possible that on very
> fast machines maybe it does not occur; we've had such difference
> between hardware before. This is a i5-3330S.
>
> It deletes files so look it over before you run it. It may also
> depend on some of my local set-up but I guess that should be easily
> fixed.
>
> Can you let me know if you can reproduce the problem with this?
>
> thanks,
>
> Erik Rijkers
>
>
>
>>>
>>> [1]
>>> https://www.postgresql.org/message-id/CAFiTN-u64S5bUiPL1q5kwpHNd0hRnf1OE-bzxNiOs5zo84i51w%40mail.gmail.com
>>>
>>>
>>> --
>>> Regards,
>>> Dilip Kumar
>>> EnterpriseDB: http://www.enterprisedb.com