Re: Transaction timeout

On Fri, Jan 13, 2023 at 10:16 AM Andrey Borodin <amborodin86@gmail.com>
wrote:

> > – it seems we could (should) have one more successful "1s wait, 3s
> sleep" iteration here, ~727ms somehow wasted in a loop, quite a lot.
>
> I think big chunk from these 727ms were spent between "BEGIN" and
> "select now(), clock_timestamp(), pg_sleep(3) \watch 1".
>

Not really – there was indeed ~2s delay between BEGIN and the first
pg_sleep query, but those ~727ms is something else.

here we measure the remainder between the beginning of the transaction
measured by "now()' and the the beginning of the last successful pg_sleep()
query:

gitpod=# select timestamptz '2023-01-13 15:51:18.179579+00' - '2023-01-13
15:49:22.906924+00';
    ?column?
-----------------
 00:01:55.272655
(1 row)

It already includes all delays that we had from the beginning of our
transaction.

The problem with my question was that I didn't take into attention that
'2023-01-13 15:51:18.179579+00' is when the last successful query
*started*. So the remainder of our 2-min quota – 00:00:04.727345 – includes
the last successful loop (3s of successful query + 1s of waiting), and then
we have failed after ~700ms.

In other words, there are no issues here, all good.

> Many thanks for looking into this!

many thanks for implementing it