Re: FDW-based dblink (WIP)

Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> I don't believe there is any consensus for integrating dblink into core,
> and I for one will resist that strongly. Keep it in contrib.

OK, our consensus is that dblink should be replaced with SQL/MED interface
and then we'll start to consider integrating into core.

However, automatic transaction management needs help by core. Is it
acceptable to have two-phase callbacks? Registered callbacks are
called with TWOPHASE_EVENT_PRE_COMMIT when a transaction is about
to be committed or prepared. The argument gxact is NULL if the
transaction is committed without 2PC.

typedef enum
{
TWOPHASE_EVENT_PRE_COMMIT,
TWOPHASE_EVENT_POST_COMMIT,
TWOPHASE_EVENT_POST_ABORT,
TWOPHASE_EVENT_RECOVER,
} TwoPhaseEvent;

typedef void (*TwoPhaseEventCallback) (
TwoPhaseEvent event, GlobalTransaction gxact, void *arg);

Regards,
---
ITAGAKI Takahiro
NTT Open Source Software Center