Re: bgworker crashed or not?

On 07/05/14 02:25, Petr Jelinek wrote:
> On 06/05/14 19:05, Robert Haas wrote:
>> What I'm inclined to do is change the logic so that:
>>
>> (1) After a crash-and-restart sequence, zero rw->rw_crashed_at, so
>> that anything which is still registered gets restarted immediately.
>
> Yes, that's quite obvious change which I missed completely :).
>
>> (2) If a shmem-connected backend fails to release the deadman switch
>> or exits with an exit code other than 0 or 1, we crash-and-restart. A
>> non-shmem-connected backend never causes a crash-and-restart.
>
> +1
>
>> (3) When a background worker exits without triggering a
>> crash-and-restart, an exit code of precisely 0 causes the worker to be
>> unregistered; any other exit code has no special effect, so
>> bgw_restart_time controls.
>
> +1
>

Ok, attached patch is my try at the proposed changes.

I don't like the reset_bgworker_crash_state function name, maybe you'll
come up with something better...

I passes my tests for the desired behavior, hopefully I didn't miss some
scenario.

--
Petr Jelinek http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services