Re: Streaming replication and non-blocking I/O

Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
> Tom Lane wrote:
>> Yeah, I have a problem with that. What's the backend doing with libpq?
>> It's not receiving this data, it's sending it.

> walreceiver is a postmaster subprocess too.

Hm. Perhaps it should be a loadable plugin and not hard-linked into the
backend? Compare dblink.

The main concern I have with hard-linking libpq is that it has a lot of
symbol conflicts with the backend --- and at least the ones from
src/port/ aren't easily removed. I foresee problems that will be very
difficult to fix on platforms where we can't filter the set of link
symbols exposed by libpq. Linking a thread-enabled libpq into the
backend could also create problems on some platforms --- it would likely
cause a thread-capable libc to get linked, which is not what we want.

regards, tom lane