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Arnaud Morin 36fb5bceab Set default heartbeat_rate to 3

Kombu recommend to run heartbeat_check every seconds but we use a lock
around the kombu connection so, to not lock to much this lock to most of
the time do nothing except waiting the events drain, we start
heartbeat_check and retrieve the server heartbeat packet only two times
more than the minimum required for the heartbeat works:
    heartbeat_timeout / heartbeat_rate / 2.0

Because of this, we are not sending the heartbeat frames at correct
intervals. E.G.

If heartbeat_timeout=60 and rate=2, AMQP protocol expects to send a
frame
every 30sec.

With the current heartbeat_check implementation, heartbeat_check will be
called every:
    heartbeat_timeout / heartbeat_rate / 2.0 = 60 / 2 / 2.0 = 15
Which will result in the following frame flow:
    T+0  --> do nothing (60/2 > 0)
    T+15 --> do nothing (60/2 > 15)
    T+30 --> do nothing (60/2 > 30)
    T+45 --> send a frame (60/2 < 45)
    ...

With heartbeat_rate=3, the heartbeat_check will be executed more often:
    heartbeat_timeout / heartbeat_rate / 2.0 = 60 / 3 / 2.0 = 10
Frame flow:
    T+0  --> do nothing (60/3 > 0)
    T+10 --> do nothing (60/3 > 10)
    T+20 --> do nothing (60/3 > 20)
    T+30 --> send a frame (60/3 < 30)
    ...

Now we are sending the frame with correct intervals

Closes-bug: #2008734

Signed-off-by: Arnaud Morin <arnaud.morin@ovhcloud.com>
Change-Id: Ie646d254faf5e45ba46948212f4c9baf1ba7a1a8

2023-08-08 15:23:59 +02:00

doc

Fix typo in quorum-related variables for RabbitMQ

2023-02-14 15:20:00 +00:00

etc

Fix spelling typo in output

2015-09-24 18:11:22 +08:00

oslo_messaging

Set default heartbeat_rate to 3

2023-08-08 15:23:59 +02:00

releasenotes

Set default heartbeat_rate to 3