Hi Tim and Tim ,
1. Even I set {persistent="true" } in broker or not, the problem is still
happened.
2. I use default setting for broker. Please see the xml file attached.
activemq.xml
<http://activemq.2283324.n4.nabble.com/file/n4698085/activemq.xml>
3. For the durable topic subscriber:
if I created Durable Topic Subscriber by Web Console, then these Durable
Topic Subscribers will be still remain when I re-start the broker. (The
problem with these Durable Topic Subscriber is that: sometimes they don't
send the pending messages to the actual subscriber when it connected).
If I created the Durable Topic Subscriber by MQTT client (MQTT client when
connect to broker without clear session) then these Durable Topic
Subscribers will be erased when broker restarts.
<http://activemq.2283324.n4.nabble.com/file/n4698085/activedurable.png>
<http://activemq.2283324.n4.nabble.com/file/n4698085/offlinedurable.png>
<http://activemq.2283324.n4.nabble.com/file/n4698085/durablejmx.png>
4. Both in Web Console and JMX, there is no more Durable Topic Subscriber.
<http://activemq.2283324.n4.nabble.com/file/n4698085/durable_restartgateway.png>
<http://activemq.2283324.n4.nabble.com/file/n4698085/durable_jmx_restartgateway.png>
5. At the time restart the broker, MQTT client can connected and create new
Durable Topic Subscribers successfully.
You can see the pictures I attached here.
Tim Bain wrote
> I agree with Tim: you haven't provided enough details about your
> configuration and your test case when asking for help. (The same was true
> for your issue that turned out to be the RETAINED flag; knowing how many
> and which messages were being re-delivered might have made it easier to
> zero in on the problem quicker.)
>
> So please tell us:
>
> - How you've configured the broker's persistence store
> <http://activemq.apache.org/persistence.html>
> - Whether you've configured any other broker options that you think
> might be relevant (the easiest way to do this is just publish your
> broker
> config file)
> - How you're creating the durable subscribers (last time you were using
> the web console; from your description I wasn't sure if the MQTT
> subscriber
> was doing that in code)
> - How you're determining that the durable subscription has been deleted
> (have you looked in JMX, or just the web console, or are you
> determining
> based whether the subscriber gets more messages?)
> - What the behavior of the subscriber is at the time you restart the
> broker (have you stopped it or is it still running? does it
> successfully
> reconnect, or not? does a new subscription get created when it
> reconnects?
> what else are you seeing that you think would be useful to us?)
>
> Tim, the other question targeted 5.11.1, so I'd guess the same is true
> here. But SummerScent, it's always good practice to make threads stand on
> their own without relying on someone having read the prior ones, because
> anyone who gets here by searching Google for a related problem isn't going
> to read the earlier threads.
>
> Tim
>
> On Mon, Jun 22, 2015 at 6:33 AM, Timothy Bish <
> tabish121@
> > wrote:
>
>> The durable subscription functionality is pretty well tested at this
>> point
>> so I'd be more inclined to suspect configuration problems. You haven't
>> set
>> something like delete all messages on start or something in your ActiveMQ
>> configuration.
>>
>> Its a good idea to provide version information and even better test cases
>> or sample code for questions like this so we can see what is going on.
>>
>> On Mon, Jun 22, 2015 at 3:02 AM, SummerScent <
> scent.o.summer@
> >
>> wrote:
>>
>> > Hi all,
>> >
>> > I have a MQTT subscriber which create some Durable Topic Subscribers
>> when
>> > connected to ActiveMQ.
>> >
>> > But when the ActiveMQ restarts, it clear all the Durable Topic
>> Subscribers.
>> >
>> > Do you have any solution to keep these Durable Topic Subscribers even
>> when
>> > the ActiveMQ restart?
>> >
>> > Thank you!
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