[RabbitMQ 3.8.2 Erlang 22.2.7] Delete exclusive queues

[moutia el amrani]

Hello

We have some queues configured   as  Exclusive and auto-delete deletion.

Is it possible to auto delete these queues when consumers failed to send basic cancel (e.g. consumer crashed) ?

 

If so could you give us the right command please ?

 

 Regards

[moutia el amrani]

We can’t use the auto-delete along with the TTL because we don't know the time of the tail consumption 

 

[Luke Bakken]

Hello,

If a consumer crashes, its connection should be closed. At this point, an exclusive queue will be deleted. Is that not what you see in your environment? Can you provide code and instructions to reproduce?

Thanks -

Luke

[moutia el amrani]

Hello Luck,

Our client is a standard client in C #, it complies with the RabbitMQ doc.

In the rabbitmq documentation it is marked that an auto-delete queue will not be deleted if:
• it didn't have a consumer - consuming with basic.get does not count as having a consumer
• the consumer failed to send basic.cancel (e.g. consumer crashed)


in our case we have some queues configured as Exclusive and auto-delete deletion and we can't auto delete theme =>
these queues consume a lot of memory

I tried to delete queues with these commands but are not deleted :

Command 1 : rabbitmqadmin --host=HOST --port=443 --ssl --vhost=VHOST --username=USERNAME --password=PASSWORD delete queue name=QUEUE_NAME
Result 1 : *** cannot obtain exclusive access to locked queue 'QUEUE_NAME' in vhost 'VHOST'. It could be originally declared on another connection or the exclusive property value does not match that of the original declaration.                                                  tion or the exclusive property value does not match that of the original declaration.

command 2 : rabbitmqctl eval '{ok, Q} = rabbit_amqqueue:lookup(rabbit_misc:r(<<"VHOST">>, queue, <<"QUEUE">>)), rabbit_amqqueue:delete_crashed(Q).'
Result 2 : remove queues: OK
but they are regenerated: why?
Question: error  in the command line?
is this the application that regenerates the queues?

If so could you give us the right command please ?

Regards

Moutia

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[Luke Bakken]

Hi Moutia,

Can you please share your code that declares your queue? I would like to know exactly how they are declared. Just describing it is not sufficient in this case.

Thanks,

Luke

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[moutia el amrani]

Hello Luke,

please find attached  RabbitMQ client code

Regards

Moutia

Hi Moutia,

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[Luke Bakken]

Hello,

OK, you are declaring your queues as auto-delete. They are NOT exclusive so I don't know why you mentioned that in your messages.

If your application is running while you delete the queues it will probably re-declare them. This depends on how often RabbitClient is instantiated, which I can't tell from the code.

If you want to check, stop your application and see if the queues are deleted as according to the auto-delete rules. If they aren't auto-deleted (because they never had messages), delete them manually. They should not be re-created.

Thanks,

Luke