Re: Freeze avoidance of very large table.

On Thu, Dec 17, 2015 at 4:10 PM, Andres Freund <andres@anarazel.de> wrote:
> On 2015-12-17 15:56:35 +0900, Michael Paquier wrote:
>> On Thu, Dec 17, 2015 at 3:44 PM, Simon Riggs <simon@2ndquadrant.com> wrote:
>> > For me, rewriting the visibility map is a new data loss bug waiting to
>> > happen. I am worried that the group is not taking seriously the potential
>> > for catastrophe here.
>>
>> FWIW, I'm following this line and merging the vm file into a single
>> unit looks like a ticking bomb.
>
> And what are those risks?

Incorrect vm file rewrite after a pg_upgrade run.
-- 
Michael