On 18 November 2016 at 10:57, Craig Ringer <cr...@2ndquadrant.com> wrote: > Hi all > > While adding support for logical decoding on standby I noticed that > the walsender doesn't respect > SIGUSR1 with PROCSIG_RECOVERY_CONFLICT_DATABASE set.
I have an update on this after further study. Surprisingly I haven't found a way to crash the walsender with it, but as expected it is also not really correct as-is. It's fine for terminating walsender sessions on database drop, or for holding a lock on an object too long. Termination due to conflict with vacuum is more problematic because: * it'll try to terminate a logical decoding walsender even if there's no real conflict, since only normal relation blocks were affected, not user catalogs or system catalogs; and * most of the time its attempts to terminate won't do anything because there's no xact running on the walsender at the time it checks for termination. So that's definitely going to need more work. I'm still interested in hearing comments from experienced folks about whether it's sane to do this at all, rather than have similar duplicate signal handling for the walsender. -- Craig Ringer http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
