Re: O(n) tasks cause lengthy startups and checkpoints

Nathan Bossart <nathandbossart@gmail.com> writes:
> On Sun, Apr 02, 2023 at 01:40:05PM -0400, Tom Lane wrote:
>> * Why does LookupCustodianFunctions think it needs to search the
>> constant array?

> The order of the tasks in the array isn't guaranteed to match the order in
> the CustodianTask enum.

Why not?  It's a constant array, we can surely manage to make its
order match the enum.

>> * The original proposal included moving RemovePgTempFiles into this
>> mechanism, which I thought was probably the most useful bit of the
>> whole thing.  I'm sad to see that gone, what became of it?

> I postponed that based on advice from upthread [1].  I was hoping to start
> a dedicated thread for that immediately after the custodian infrastructure
> was committed.  FWIW I agree that it's the most useful task of what's
> proposed thus far.

Hmm, given Andres' objections there's little point in moving forward
without that task.

            regards, tom lane