Hi, On 2026-01-20 09:30:33 +0100, Antonin Houska wrote: > Antonin Houska <[email protected]> wrote: > > > I'm not sure yet how to fix the problem. I tried to call XactLockTableWait() > > from SnapBuildAddCommittedTxn() (like it happens in > > SnapBuildWaitSnapshot()), > > but it made at least one regression test (subscription/t/010_truncate.pl) > > stuck - probably a deadlock. I can spend more time on it, but maybe someone > > can come up with a good idea sooner than me. > > Attached here is what I consider a possible fix - simply wait for the CLOG > update before building a new snapshot.
I don't think that's enough - during non-timetravel visibility semantics, you can only look at the clog if the transaction isn't marked as in-progress in the procarray. ISTM that we need to do that here too? Greetings, Andres
