[Koha-bugs] [Bug 32558] Allow background_jobs_worker.pl to process multiple jobs simultaneously up to a limit

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=32558

--- Comment #21 from David Cook <dcook at prosentient.com.au> ---
(In reply to Jonathan Druart from comment #14)
> From
> https://www.grzegorowski.com/rabbitmq-406-channel-closed-precondition-failed
> 
> "You have to ACK messages in same order as they arrive to your system"
> 
> If this is correct, forking is not an option here.

Or rather, Kyle's patch is just forking at the wrong point.

I've just reviewed the patches again, and I notice that this is a forking job
server style, but we need a pre-forking job server style. 

That is, following GetOptions, we should fork, and each child process gets its
own connection with RabbitMQ. Then each child process ACKs the messages in the
same order it receives on its own separate connection (and channel).

That way, it's functionally the same thing as running 4 separate background job
worker processes.

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