Facing cluster testing issue with ActiveMQ Artemis - activemq-artemis

Question

I have 2 instances of ActiveMQ Artemis , simply created with command
/.artemis create artemis/server1 and
/.artemis create artemis/server2
I am using linux ubantu.
here is broker.xml for server1:
<acceptors>
<!-- Acceptor for every supported protocol -->
<acceptor name="artemis">tcp://0.0.0.0:61616?tcpSendBufferSize=1048576;tcpReceiveBufferSize=1048576;protocols=CORE,AMQP,STOMP,HORNETQ,MQTT,OPENWIRE;useEpoll=true;amqpCredits=1000;amqpLowCredits=300</acceptor>
</acceptors>
<connectors>
<connector name="netty-connector">tcp://localhost:61616</connector>
<!-- connector to the server1 -->
<connector name="server1-connector">tcp://localhost:61617</connector>
</connectors>
<cluster-connections>
<cluster-connection name="my-cluster">
<connector-ref>netty-connector</connector-ref>
<retry-interval>500</retry-interval>
<use-duplicate-detection>true</use-duplicate-detection>
<message-load-balancing>STRICT</message-load-balancing>
<max-hops>1</max-hops>
<static-connectors>
<connector-ref>server1-connector</connector-ref>
</static-connectors>
</cluster-connection>
</cluster-connections>
and here is broker.xml for server2:
<!-- Acceptor for every supported protocol -->
<acceptor name="artemis">tcp://0.0.0.0:61617?tcpSendBufferSize=1048576;tcpReceiveBufferSize=1048576;protocols=CORE,AMQP,STOMP,HORNETQ,MQTT,OPENWIRE;useEpoll=true;amqpCredits=1000;amqpLowCredits=300</acceptor>
</acceptors>
<connectors>
<connector name="netty-connector">tcp://localhost:61617</connector>
<!-- connector to the server0 -->
<connector name="server0-connector">tcp://localhost:61616</connector>
</connectors>
<cluster-connections>
<cluster-connection name="my-cluster">
<connector-ref>netty-connector</connector-ref>
<retry-interval>500</retry-interval>
<use-duplicate-detection>true</use-duplicate-detection>
<message-load-balancing>STRICT</message-load-balancing>
<max-hops>1</max-hops>
<static-connectors>
<connector-ref>server0-connector</connector-ref>
</static-connectors>
</cluster-connection>
</cluster-connections>
Also in server2, change in bootstrap.xml, changes web bind port
<web bind="http://localhost:8163" path="web">
I am testing it with StaticClusteredQueueExample and this example working file.
Now I am running the ActiveMQ Artemis JMeter Performance against my cluster, I am using JMeter Testing Examples which is here
Now when i am running point to point test with Jmeter is giving me near 50% errors rate (Aggregate Report in Jmeter) in consumer,
But where i am running only one node(any of server1 or server2) in ubantu system, it's working fine, 0% error rate(Aggregate Report in Jmeter).
Can you please help why i am getting 50% errors rate(Aggregate Report in Jmeter) when running multiple instances(nodes) with docker

Answer 1

The problem is that you're mixing one example (i.e. the JMeter example) with a cluster configuration (i.e. from the clustered-static-discovery example) that really isn't compatible.
The <message-load-balancing> of the cluster is STRICT which means messages will be load-balanced across the cluster regardless of the presence of consumers. Furthermore, the default <redistribution-delay> is -1 meaning the messages sent to the other nodes in the cluster due to the STRICT message-load-balancing type will stay on those nodes and will not be redistributed based on consumer demand.
The JMeter example was written with a single node in mind so it only send messages to and consumes messages from 1 node which means it will only receive back half of the messages that it sends as the other half will have been forwarded to the other node in the cluster due to the configuration.
If you change the <message-load-balancing> to ON_DEMAND you won't see any errors as all the messages will stay on the node where they were specifically sent which is also where the consumer will be connected.