activemq-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Martin Cornelius (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-1932) Weak scalability in network of brokers (subsrciption shows quadratic order)
Date Wed, 10 Sep 2008 14:50:52 GMT
Weak scalability in network of brokers (subsrciption shows quadratic order)
---------------------------------------------------------------------------

                 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.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message