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From Martyn Taylor <mtay...@redhat.com>
Subject Re: ARTEMIS: bad-performance behaviour after 7-10 days of usage
Date Mon, 06 Feb 2017 16:12:33 GMT
Francesco,

Thanks for providing this information.  I think there's a couple of things
going on and I'd like to work with you to create some reproducers, we could
have a chat IRC #apache-activemq@freenode.net and I'll see if I can
recreate your env / case in our test suite.

With the case above, the mosquitto client is sending a subscribe frame on
every connection.  Artemis is then treating this as a new subscription
(even though the subscription queue already exists), and is copying over
the retain messages.  It's a reasonably trivial change, I should have a fix
for you shortly.

Thanks
Martyn

On Fri, Feb 3, 2017 at 11:39 AM, francesco81 <Francesco.PADOVANI@bticino.it>
wrote:

> Hi Clebert,
> ok, we will build some junit tests to replicate the problem, follwing the
> exemple section.
> Meanwhile, I can confirm to you the bug(s): it seems that the reference to
> the message is never removed from the queue. If the message is not retained
> it persists 1 reference on the queue and every time my client reconnect to
> the broker it will receive always the same message. If the message is
> retained is even worse, because it goes to increment the references on the
> queue and every time the client connects to the broker it will receive n +
> 1
> times the same retained message where n is the re-connection number n.
> Following a simple test I made by using mosquitto client:
>
> CLIENT 1 (publisher):
> mosquitto_pub -h <host> -q 1 -i <client_id_pub> -t
> /cro/plantid/0000000/gwid/00001/device_state -m "test non retained"
>
> CLIENT 2 (subscriber):
> 1 connection:
> mosquitto_sub -h <host> -q 2 -i <client_id_sub> -t
> /cro/plantid/0000000/gwid/00001/device_state
> --> received:
> *test non retained*
> 2 connection:
> mosquitto_sub -h <host> -q 2 -i <client_id_sub> -t
> /cro/plantid/0000000/gwid/00001/device_state
> --> received again:
> *test non retained*
> 3 connection:
> mosquitto_sub -h <host> -q 2 -i <client_id_sub> -t
> /cro/plantid/0000000/gwid/00001/device_state
> --> received again:
> *test non retained*
> ...
> and so on
>
> CLIENT 1 (publisher):
> mosquitto_pub -h <host> -q 1 -i <client_id_pub> -r -t
> /cro/plantid/0000000/gwid/00001/device_state -m "test retained"
>
> CLIENT 2 (subscriber):
> 4 connection:
> mosquitto_sub -h <host> -q 2 -i <client_id_sub> -t
> /cro/plantid/0000000/gwid/00001/device_state
> --> received:
> *test retained
> test non retained
> test retained*
> 5 connection:
> mosquitto_sub -h <host> -q 2 -i <client_id_sub> -t
> /cro/plantid/0000000/gwid/00001/device_state
> --> received:
> *test retained
> test non retained
> test retained
> test retained*
> 6 connection:
> mosquitto_sub -h <host> -q 2 -i <client_id_sub> -t
> /cro/plantid/0000000/gwid/00001/device_state
> --> received:
> *test non retained
> test retained
> test retained
> test retained
> test retained*
> ...
> and so on.
>
> If you agree, I would open a bug for this.
>
> Francesco
>
>
>
> --
> View this message in context: http://activemq.2283324.n4.
> nabble.com/ARTEMIS-bad-performance-behaviour-after-7-10-days-of-usage-
> tp4721272p4721562.html
> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>

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