Re: Hot Standby and VACUUM FULL

Simon Riggs <simon@2ndQuadrant.com> writes:
> The last item on my list before close is making VACUUM FULL and Hot
> Standby play nicely together.

> The options to do this were and still are:

> (1) Add WAL messages for non-transactional relcache invalidations
> (2) Allow system relations to be cluster-ed/vacuum full-ed.

> (1) was how we did it originally and I believe it worked without
> problem. We saw the opportunity to do (2) and it has been worth
> exploring.

Refresh my memory on why (1) lets us avoid fixing (2)?  It sounds
like a kluge at best ...
        regards, tom lane