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Bug 32481: Limit prefetch size for background jobs worker

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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@bugs.koha-community.org>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit cd89c38321)
Signed-off-by: Jacob O'Mara <jacob.omara@ptfs-europe.com>
This commit is contained in:
David Cook 2022-12-22 22:17:04 +00:00 committed by Jacob O'Mara
parent 299a7fdf9c
commit 6238ce057e
1 changed files with 5 additions and 1 deletions
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6
misc/background_jobs_worker.pl
View file

@ -78,7 +78,11 @@ if ( $conn ) {
# FIXME cf note in Koha::BackgroundJob about $namespace
my $namespace = C4::Context->config('memcached_namespace');
for my $queue (@queues) {
$conn->subscribe({ destination => sprintf("/queue/%s-%s", $namespace, $queue), ack => 'client' });
$conn->subscribe({
destination => sprintf("/queue/%s-%s", $namespace, $queue),
ack => 'client',
'prefetch-count' => 1,
});
}
}
while (1) {