Re: BUG #17485: Records missing from Primary Key index when doing REINDEX INDEX CONCURRENTLY

Hi,

On 2022-05-28 11:26:55 +0500, Andrey Borodin wrote:
> > On 28 May 2022, at 04:13, Andres Freund <andres@anarazel.de> wrote:
> > 
> > Seems like we should add a test for HOT vs CONCURRENTLY?
> 
> This test fails on my machine with 35K transactions. And fails in ~50% of cases with 30K transactions.
> And this seems like a lot of work, ~10 CPU seconds. How can we reduce the time to reproduce?

I think you basically need to force some, but not all, of the modifying
transactions to be open for a bit longer, so that it's more likely that
there's a chance to prune vs CIC waiting. Might also be helpful to update rows
multiple times within an xact.

Greetings,

Andres Freund