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From "Eivind Sivertsen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-3376) Master/slave + cluster leaves messages on slave
Date Thu, 23 Jun 2011 11:36:47 GMT
Master/slave + cluster leaves messages on slave
-----------------------------------------------

                 Key: AMQ-3376
                 URL: https://issues.apache.org/jira/browse/AMQ-3376
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker, Message Store
    Affects Versions: 5.5.0
         Environment: OS: Gentoo Linux.
AMQ: apache-activemq-5.5.0-bin.tar.gz downloaded from http://activemq.apache.org/
            Reporter: Eivind Sivertsen


I've setup 4 servers: two master/slave pairs, where the masters are clustered. Topology looks
like this:

!http://activemq.2283324.n4.nabble.com/file/n3617053/amq_setup.001.jpg!

All nodes run on the same host, but within separate folders on the filesystem, so no nodes
are sharing anything.

I set up consumers on Node 1 and Node 3. 
I start producing messages to Node 1. 

Messages are distributed (load balanced) across Node 1 and Node 3 as expected, so consumers
on both nodes receive messages. 

Messages produced to Node 1 are written to the slave node, Node 2, as expected. But messages
that are forwarded to Node 3 for consumption there, are not deleted from Node 2.

If I produce 1000 messages to Node 1, and 400 of those are forwarded to Node 3, there are
400 messages left on Node 2 when all messages are consumed from Node 1 and Node 3 (queueSize
= 0 on both). So the messages that are consumed on Node 1 are deleted from Node 2, but not
those forwarded to Node 3.

A possible fix: messages that are received on a master node, but forwarded to another node
in the cluster, are *not* stored on the slave node.

The [ActiveMQ User mail list discussion|http://activemq.2283324.n4.nabble.com/Master-slave-cluster-leaves-messages-on-slave-td3617053.html]
has links to the configurations for node 1-4.

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