Re: [PATCH] pg_isready (was: [WIP] pg_ping utility)

Phil Sorber <phil(at)omniti(dot)com> writes:
> On Wed, Jan 23, 2013 at 1:58 PM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
>> On Wed, Jan 23, 2013 at 12:27:45PM -0500, Tom Lane wrote:
>>> +1 for default timeout --- if this isn't like "ping" where you are
>>> expecting to run indefinitely, I can't see that it's a good idea for it
>>> to sit very long by default, in any circumstance.

>> FYI, the pg_ctl -w (wait) default is 60 seconds:

> Great. That is what I came to on my own as well. Figured that might be
> a sticking point, but as there is precedent, I'm happy with it.

I'm not sure that's a relevant precedent at all. What that number is
is the time that pg_ctl will wait around for the postmaster to start or
stop before reporting a problem --- and in either case, a significant
delay (multiple seconds) is not surprising, because of crash-recovery
work, shutdown checkpointing, etc. For pg_isready, you'd expect to get
a response more or less instantly, wouldn't you? Personally, I'd decide
that pg_isready is broken if it didn't give me an answer in a couple of
seconds, much less a minute.

What I had in mind was a default timeout of maybe 3 or 4 seconds...

regards, tom lane