> On 26 Jan 2017, at 12:51, Craig Ringer <cr...@2ndquadrant.com> wrote: > > * Tracking xid/gid map in memory also doesn’t help much — if server reboots > between prepare > and commit we’ll lose that mapping. > > Er what? That's why I suggested using the prepared xacts shmem state. It's > persistent as you know from your work on prepared transaction files. It has > all the required info.
Imagine following scenario: 1. PREPARE happend 2. PREPARE decoded and sent where it should be sent 3. We got all responses from participating nodes and issuing COMMIT/ABORT 4. COMMIT/ABORT decoded and sent After step 3 there is no more memory state associated with that prepared tx, so if will fail between 3 and 4 then we can’t know GID unless we wrote it commit record (or table). -- Stas Kelvich Postgres Professional: http://www.postgrespro.com The Russian Postgres Company -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers