Re: Hot Standby and deadlock detection

Simon Riggs wrote:
> The way this would work is if Startup waits on a buffer pin we
> immediately send out a request to all backends to cancel themselves if
> they are holding the buffer pin required && waiting on a lock. We then
> sleep until max_standby_delay. When max_standby_delay = -1 we only sleep
> until deadlock timeout and then check (on the Startup process).

Should wake up to check for deadlocks after deadlock_timeout also when
max_standby_delay > deadlock_timeout. max_standby_delay could be hours -
we want to detect a deadlock sooner than that.

Generally speaking, max_standby_delay==-1 codepath shouldn't be any
different from the max_standby_delay>0 codepath.

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com