[Koha-bugs] [Bug 32481] Rabbit times out when too many jobs are queued and the response takes too long

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

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=32481

Nick Clemens <nick at bywatersolutions.com> changed:

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--- Comment #35 from Nick Clemens <nick at bywatersolutions.com> ---
Created attachment 145208
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https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=145208&action=edit
Bug 32481: Limit prefetch size for background jobs worker

This patch adds a prefetch size of 1 to the background jobs worker,
so that it fetches 1 message at a time. Without this change,
the RabbitMQ connection timeout when too many messages for slow tasks
are fetched at the same time.

To test:
0. Apply patch
1. Run background worker
2. Rapidly enqueue multiple jobs that in total will take longer
than 30 minutes to process

Bug 32481: Use correct prefetch syntax for RabbitMQ

According to https://www.rabbitmq.com/stomp.html the header to
use for managing the prefetch is "prefetch-count".

You can verify the number of delivered and unacknowledged messages
on a channel on a connection by running "rabbitmqctl list_channels"
on the RabbitMQ host. This will tell you how many messages have been
delivered and are awaiting acknowledgement

Signed-off-by: Jonathan Druart <jonathan.druart at bugs.koha-community.org>

Signed-off-by: Nick Clemens <nick at bywatersolutions.com>

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