Re: Hot Standby query cancellation and Streaming Replication integration

Bruce Momjian <bruce@momjian.us> writes:
> Doesn't the system already adjust the delay based on the length of slave
> transactions, e.g. max_standby_delay.  It seems there is no need for a
> user switch --- just max_standby_delay really high.

Well that GUC looks like it allows to set a compromise between HA and
reporting, not to say "do not ever give the priority to the replay while
I'm running my reports". At least that's how I understand it.

The feedback loop might get expensive on master server when running
reporting queries on the slave, unless you can "pause" it explicitly I
think. I don't see how the system will guess that you're running a
reporting server rather than a HA node, and max_standby_delay is just a
way to tell the standby to please be nice in case of abuse.

Regards,
-- 
dim