Re: parallel mode and parallel contexts

Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> On Sat, Jan 3, 2015 at 7:31 PM, Andres Freund <andres(at)2ndquadrant(dot)com> wrote:
>> * I wonder if parallel contexts shouldn't be tracked via resowners

> That is a good question. I confess that I'm somewhat fuzzy about
> which things should be tracked via the resowner mechanism vs. which
> things should have their own bespoke bookkeeping. However, the
> AtEOXact_Parallel() stuff happens well before ResourceOwnerRelease(),
> which makes merging them seem not particularly clean.

FWIW, the resowner mechanism was never meant as a substitute for bespoke
bookkeeping. What it is is a helper mechanism to reduce the need for
PG_TRY blocks that guarantee that a resource-releasing function will be
called even in error paths. I'm not sure whether that analogy applies
well in parallel-execution cases.

regards, tom lane