Re: Reviewing freeze map code

Robert Haas <robertmhaas@gmail.com> writes:
> On Mon, Jun 20, 2016 at 5:59 PM, Andres Freund <andres@anarazel.de> wrote:
>> Consider what happens if we, after restarting at l2, notice that we
>> can't actually insert, but return in the !HeapTupleMayBeUpdated
>> branch.

> OK, I see what you mean.  Still, that doesn't seem like such a
> terrible cost.  If you try to update a tuple and if it looks like you
> can update it but then after TOASTing you find that the status of the
> tuple has changed such that you can't update it after all, then you
> might need to go set xmax = MyTxid() on all of the TOAST tuples you
> created (whose CTIDs we could save someplace, so that it's just a
> matter of finding them by CTID to kill them).

... and if you get an error or crash partway through that, what happens?
        regards, tom lane