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From: Craig Ringer <craig@2ndquadrant.com>
To: Petr Jelinek <petr@2ndquadrant.com>
To: Robert Haas <robertmhaas@gmail.com>
To: Andres Freund <andres@2ndquadrant.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Antonin Houska <antonin.houska@gmail.com>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Cc: Abhijit Menon-Sen <ams@2ndQuadrant.com>
Subject: Re: bgworker crashed or not?
Date: Thu, 24 Apr 2014 13:39:27 +0800
Message-ID: <5358A38F.50808@2ndquadrant.com> (raw)
In-Reply-To: <534F21E6.7080705@2ndquadrant.com>
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On 04/17/2014 08:35 AM, Craig Ringer wrote:
> On 04/17/2014 04:47 AM, Petr Jelinek wrote:
>>
>> Well the logging is just too spammy in general when it comes to dynamic
>> bgworkers but that's easy to fix in the future, no need to make
>> decisions for 9.4.
> 
> Agreed - it's the *API* that we need sorted out for 9.4, and log output
> isn't something Pg tends to consider part of the API.
> 
>> However I really don't like that I have to exit with exit code 1, which
>> is normally used as failure, if I want to shutdown my dynamic bgworker
>> once it has finished the work. And this behavior is something we can set
>> properly only once...
> 
> As far as I can tell we have a couple of options:
> 
> - Redefine what the exit codes mean so that exit 0 suppresses
> auto-restart and exits silently. Probably simplest.

I'm now strongly in favour of this alternative.

I've just noticed that the bgworker control interfaces do not honour
bgw.bgw_restart_time = BGW_NEVER_RESTART if you exit with status zero.

This means that it's not simply a problem where you can't say "restart
me if I crash, but not if I exit normally".

You also can't even say "never restart me at all". Because
"BGW_NEVER_RESTART" seems to really mean "BGW_NO_RESTART_ON_CRASH".

This _needs_fixing before 9.4.



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


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