I believe I read this somewhere previously, but cannot currently find it.
For a Disk Assisted In-Memory queue configuration, messages are pulled off
the top of the disk queue, correct? So for a sufficiently busy action queue,
messages will be dequeued out of order and delivered to their destination
out of order?
When a disk assisted queue is being drained, current messages are delivered
first, and then when the queue size drops 'low enough', rsyslog will pull
messages from disk and send them.
So yes, the messages will be delivered out of order. This is only one of the
many ways that messages can end up being processed out of order. Rsyslog is
multi-threaded, so if you get busy enough to have two threads sending messages,
they will each be processing messages independently of each other and this will
result in re-ordering of messages. But even with traditional syslog, UDP packets
have been known to get re-ordered over the network, causing logs to arrive out
of order. The advanced features of Rsyslog can trigger this in more common
cases, but it's a matter of how common this is, not if it happens or not.
David Lang
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