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8.2. Queue Sizing

8.2.1. Controlling Queue Size
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Controlling the size of queues is an important part of performance management in a messaging system.
When queues are created, you can specify a maximum queue size (qpid.max_size) and maximum message count (qpid.max_count) for the queue.
qpid.max_size is specified in bytes. qpid.max_count is specified as the number of messages.
The following qpid-config creates a queue with a maximum size in memory of 200MB, and a maximum number of 5000 messages: 
qpid-config add queue my-queue --max-queue-size=204800000 --max-queue-count 5000
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In an application, the qpid.max_count and qpid.max_size directives go inside the arguments of the x-declare of the node. For example, the following address will create the queue as the qpid-config command above:
Python
tx = ssn.sender("my-queue; {create: always, node: {x-declare: {'auto-delete': True, arguments:{'qpid.max_count': 5000, 'qpid.max_size': 204800000}}}}")
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Note that the qpid.max_count attribute will only be applied if the queue does not exist when this code is executed.
Behavior when limits are reached: qpid.policy_type

The behavior when a queue reaches these limits is configurable. By default, on non-durable queues the behavior is reject: further attempts to send to the queue result in a TargetCapacityExceeded exception being thrown at the sender.

The configurable behavior is set using the qpid.policy_type option. The possible values are:
reject
Message publishers throw an exception TargetCapacityExceeded. This is the default behavior for non-durable queues.
ring
The oldest messages are removed to make room for newer messages.
The following example qpid-config command sets the limit policy to ring: 
qpid-config add queue my-queue --max-queue-size=204800 --max-queue-count 5000 --limit-policy ring
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The same thing is achieved in an application like so:
Python
tx = ssn.sender("my-queue; {create: always, node: {x-declare: {'auto-delete': True, arguments:{'qpid.max_count': 5000, 'qpid.max_size': 204800, 'qpid.policy_type': 'ring'}}}}")
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