Re: StandbyRecoverPreparedTransactions recovers subtrans links incorrectly

On 23 April 2017 at 17:17, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Simon Riggs <simon(at)2ndquadrant(dot)com> writes:
>>> Also, when I fix that, it gets further but still crashes at the same
>>> Assert in SubTransSetParent. The proximate cause this time seems to be
>>> that RecoverPreparedTransactions's calculation of overwriteOK is wrong:
>>> it's computing that as "false", but in reality the subtrans link in
>>> question has already been set.
>
>> Not sure about that, investigating.
>
> As a quick hack, I just hotwired RecoverPreparedTransactions to set
> overwriteOK = true always, and with that and the SubTransSetParent
> argument-order fix, HEAD passes the recovery tests. Maybe we can
> be smarter than that, but this might be a good short-term fix to get
> the buildfarm green again.

That would work. I've been looking into a fix I can explain, but "do
it always" may actually be it.

OK, I'll do that.

--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services