Re: Load Balancing problems

[Lars Heinemann]

Ganesh,

actually I never tried to setup 2 smx instances working together, but I know 
that the default transport policy of smx is the FirstChoicePolicy. That means 
it will always take the first endpoint in the list of available endpoint to 
route the message to.
Sounds somehow like your problem, doesn't it?

So if the activemq is somehow that intelligent under the hood, then it should 
pass the messages in equal load to your endpoints. But as I understood you, 
this is not the case.

Another thing. The round robin policy is part of smx. Actually it is only in 
3.3 version. Some minutes ago I put it to 3.2.
So you would probably have to choose the RandomChoicePolicy for your testing. The problem with this policy is that it will choose the endpoint randomly...so don't expect that much. 


Lars




navigator09 schrieb:
Hi Lars,

 I am using the servicemix version 3.2.1 . I have a doubt here. The
servicemix load balancing feature is provided by apache mq. I have read the
documentation of apache MQ and it says that, load bancing is done by
splitting the total load into equally among servicemix instances. If they
are using round robin algoritham, then for 10messages how will they
distribute the load?

Regards,
Ganesh


lhe77 wrote:
  
Btw. I am not sure if this policy is already in your smx version.
Otherwise you need to use the RandomChoicePolicy or get the actual trunk 
version of smx.

Lars




Lars Heinemann schrieb:
    
Hi,

try adding this to your servicemix.xml:

...
</sm:container>

 <bean factory-method="getBroker" factory-bean="jbi">     <property 
name="defaultServiceChooser">        <bean 
class="org.apache.servicemix.jbi.resolver.ServiceRoundRobinPolicy" /> 
    </property>
 </bean>

...


In the above case there will be a round robin logic used to choose 
between services with the same name.
There is also a RandomChoicePolicy, but it's not that effective in my 
opinion.

Hope this helps,
Lars



navigator09 schrieb:
      
Hi , I am tryning to achieve load balancing in servicemix as 
mentioned in the
tutorial http://servicemix.apache.org/clustering.html.

 The bridge between the two services is successfully done, however 
when I
send 10 messages to any one instance, all ten messages are handled by 
that
instance only. It dosnt load balance. I am posting the active MQ files
below. Let me know how to solve the matter.


<?xml version="1.0" encoding="UTF-8"?>
<!--

    Licensed to the Apache Software Foundation (ASF) under one or more
    contributor license agreements.  See the NOTICE file distributed 
with
    this work for additional information regarding copyright ownership.
    The ASF licenses this file to You under the Apache License, 
Version 2.0
    (the "License"); you may not use this file except in compliance with
    the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
implied.
    See the License for the specific language governing permissions and
    limitations under the License.

-->
<beans xmlns:amq="http://activemq.org/config/1.0";>
    <!-- ActiveMQ JMS Broker configuration -->
  <amq:broker id="broker" brokerName="pd92" depends-on="jmxServer"
useShutdownHook="false">

    <!-- Disable creation of the jmx connector          which is 
created in the jmx.xml configuration file -->
    <amq:managementContext>
      <bean class="org.apache.activemq.broker.jmx.ManagementContext">
        <property name="createConnector" value="false" />
      </bean>
    </amq:managementContext>

    <!-- Use journaled JDBC persistence -->
    <amq:persistenceAdapter>
      <amq:journaledJDBC journalLogFiles="5"
dataDirectory="D:\apache-servicemix-3.2.1\data\amq"/>
 
      <!-- To use a different datasource, use th following syntax : -->
      <!--       <amq:journaledJDBC journalLogFiles="5" 
dataDirectory="../data"
dataSource="#postgres-ds"/>
       -->
    </amq:persistenceAdapter>
      <amq:transportConnectors>
       <!-- Activate a TCP connector with multicast discovery.
            Note that multicast may be disabled if your computer
            is not on a network, which may prevent the broker to start.
            In such a case, just remove the discoveryUri attribute.  
         -->
            <amq:transportConnector uri="tcp://localhost:61616"/>

    </amq:transportConnectors>
        <amq:networkConnectors>
      <!-- by default just auto discover the other brokers -->
     <!-- <amq:networkConnector uri="multicast://default"/> -->
             <amq:networkConnector uri="static://(tcp://pd190:61616)"
conduitSubscriptions="false"/>
          </amq:networkConnectors>
      </amq:broker>
    <!--  This xbean configuration file supports all the standard 
spring xml
configuration options -->
    <!-- Postgres DataSource Sample Setup -->
  <!--   <bean id="postgres-ds" 
class="org.postgresql.ds.PGPoolingDataSource">
    <property name="serverName" value="localhost"/>
    <property name="databaseName" value="activemq"/>
    <property name="portNumber" value="0"/>
    <property name="user" value="activemq"/>
    <property name="password" value="activemq"/>
    <property name="dataSourceName" value="postgres"/>
    <property name="initialConnections" value="1"/>
    <property name="maxConnections" value="10"/>
  </bean>
  -->
    <!-- MySql DataSource Sample Setup using the Commons DBCP pooler
(http://jakarta.apache.org/commons/dbcp/) -->
  <!--   <bean id="mysql-ds" 
class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql://localhost/activemq"/>
    <property name="username" value="activemq"/>
    <property name="password" value="activemq"/>
    <property name="poolPreparedStatements" value="true"/>
  </bean>
  --> 
  <!-- MySql DataSource Sample Setup using the c3p0 pooler
(http://sf.net/projects/c3p0) -->
  <!--   <bean id="mysql-ds" 
class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
    <property name="driverClass" value="com.mysql.jdbc.Driver">
    <property name="jdbcUrl" 
value="jdbc:mysql://localhost:3306/activemq">
    <property name="user" value="activemq">
    <property name="password" value="activemq">
    <property name="minPoolSize" value="5">
    <property name="maxPoolSize" value="10">
    <property name="acquireIncrement" value="3">
  </bean>
  -->
     <!-- Embedded Derby DataSource Sample Setup -->
  <!--   <bean id="derby-ds" 
class="org.apache.derby.jdbc.EmbeddedDataSource">
    <property name="databaseName" value="derbydb"/>
    <property name="createDatabase" value="create"/>
  </bean>
  --> 
</beans>


Regards,
Ganesh