Hi,
Currently RelationFindReplTupleByIndex(), RelationFindReplTupleSeq()
lock the found tuple. I don't quite get what that achieves - why isn't
dealing with concurrency in the table_update/delete calls at the
callsites sufficient? As far as I can tell there's no meaningful
concurrency handling in the heap_lock_tuple() paths, so it's not like we
follow update chains or anything. As far as I can tell this just nearly
doubles the number of WAL records when replaying updates/deletes?
Greetings,
Andres Freund