by default, there is one main queue. If you have an input tied to a ruleset, the
messages still go on the main queue.
If you define a queue on that ruleset, the incoming messages never hit the main
queue (the queue for the ruleset effectively becomes the main queue for those
messages)
each queue has one or more worker threads, those worker threads go through the
config and execute each statement. Some of the statements will reference another
queue. In those cases, the worker thread just copies the message to that queue
and continues (assuming the queue isn't full) These queues will then have their
own worker threads, and can then run into things that involve additional queues.
as for how the worker threads operation on different actions, see if this helps
you understand it
https://www.rsyslog.com/doc/v8-stable/whitepapers/queues_analogy.html
On Tue, 14 Apr 2020, Mariusz Kruk via rsyslog wrote:
Date: Tue, 14 Apr 2020 15:32:46 +0200
From: Mariusz Kruk via rsyslog <[email protected]>
To: [email protected]
Cc: Mariusz Kruk <[email protected]>
Subject: [rsyslog] Number of queues
Hi. I'm getting a bit confused reading the docs regarding queues.
On one hand - the https://www.rsyslog.com/doc/master/concepts/queues.html
document says that "Currently, queues are used for the main message queue and
for the actions. There is a single main message queue inside rsyslog. Each
input module delivers messages to it".
On the other hand,
https://www.rsyslog.com/doc/master/concepts/multi_ruleset.html says that you
can activate per-ruleset queue by setting queue.type for a ruleset.
So how does it work, especially with many inputs tied to different rulesets
having their own queues? And multiple outputs, possibly with relations
many-to-many between inputs and outputs.
Intuitive answer would be that every input is tied to a different ruleset and
thus different queue. Outputs have their own queues. But what is the
connection between input ruleset queues and output queues?
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