Weak scalability in network of brokers (subsrciption shows quadratic order)
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Key: AMQ-1932
URL: https://issues.apache.org/activemq/browse/AMQ-1932
Project: ActiveMQ
Issue Type: Improvement
Components: Broker
Affects Versions: 5.1.0
Environment: Linux 2.6.25, Java 1.6.0._07
Reporter: Martin Cornelius
In a network of brokers, any subscription to a topic causes a network load that
is related to the number of brokers with quadratic order.
On subscription to a topic, the broker where the subscription is done sends a
control-message to all other brokers. Every broker reacts on this
control-message by sending another control-message to all other brokers. The
same happens on every unsubscribing from a topic. This implies, that the
network load caused by a (un)subscription is governed by the term N*N, what
kills scalability.
Interestingly, when subscribing to a queue, (as opposed to a topic) this 'evil'
behaviour is observed only on the very first subscription to the queue.(i
suppose when the queue is 'unknown' to the brokers) All subsequent
subscriptions to a queue that has been subscribed to before by any client show
only linear order, means: The broker where the subscription is made sends a
control-message to all other brokers, but this does NOT trigger subsequent
messages. Also, unsubscription from a topic always behaves the latter way.
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