On Fri, Jan 17, 2025 at 1:43 AM Dilip Kumar <dilipbalaut@gmail.com> wrote: > > On Fri, Jan 17, 2025 at 6:37 AM Masahiko Sawada <sawada.mshk@gmail.com> wrote: >> >> On Sun, Jan 12, 2025 at 1:34 AM Masahiko Sawada <sawada.mshk@gmail.com> wrote: >> > > > > IIRC, there was one of the blocker for implementing parallel heap vacuum was group locking, have we already resolved that issue or its being included in this patch set?
I recall we had some discussion on changes to group locking for implementing parallel heap vacuum, but I don't remember if we have a blocker now.
One problem we previously had was that since the relation extension locks were not in conflict between parallel workers and the leader, multiple workers could extend the visibility map simultaneously. This problem was fixed by commit 85f6b49c2c.
Yes, that's correct. As part of that commit, we made the relation extension lock conflict among group members, ensuring that multiple workers cannot acquire it simultaneously. Additionally, this cannot cause a deadlock because no other locks are held while the relation extension lock is being held.
