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List:       esb-java-dev
Subject:    [esb-java-dev] [jira] Commented: (ESBJAVA-439) Now with support for
From:       "indika kumara (JIRA)" <jira () wso2 ! org>
Date:       2008-03-19 10:12:44
Message-ID: 469399016.1205921564289.JavaMail.jira () wso2 ! org ! ec2 ! wso2 ! com
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    [ https://wso2.org/jira/browse/ESBJAVA-439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16009#action_16009 \
] 

indika kumara commented on ESBJAVA-439:
---------------------------------------

I have committed the required implementation and do a simple test using existing \
samples.

To test this , need synapse current svn 

Note : To work load balancing in a clustered environment , it is mandatory to give \
the name of each endpoints (all child endpoints...  ).This is need , because synapse \
itself doesn't provide clustering capability and if any component need to be cluster \
aware , then all dynamic states of it must keep in the axis2 configuration context as \
a property so that those can be replicated across all instances in a cluster. The \
name is needed because it will be the unique id for states of the that endpoint and \
it is used for storing and picking up corresponding states from axis2 configuration \
context. 

To improve performances , each single states is replicated only when it's value is \
changed. Therefore , only value with Java primitive types are replicated. For these , \
name is mandatory for each child endpoints.

One example for check cluster aware load balancing 

<!-- Session less load balancing between 3 endpoints -->
<definitions xmlns="http://ws.apache.org/ns/synapse">

    <sequence name="main" onError="errorHandler">
        <in>
            <send>
                <endpoint name="root">
                    <loadbalance>
                        <endpoint name="one">
                            <address uri="http://localhost:9001/soap/LBService1">
                                <enableAddressing/>
                                \
<suspendDurationOnFailure>60</suspendDurationOnFailure>  </address>
                        </endpoint>
                        <endpoint name="two">
                            <address uri="http://localhost:9002/soap/LBService1">
                                <enableAddressing/>
                                \
<suspendDurationOnFailure>60</suspendDurationOnFailure>  </address>
                        </endpoint>
                        <endpoint name="three">
                            <address uri="http://localhost:9003/soap/LBService1">
                                <enableAddressing/>
                                \
<suspendDurationOnFailure>60</suspendDurationOnFailure>  </address>
                        </endpoint>
                    </loadbalance>
                </endpoint>
            </send>
            <drop/>
        </in>

        <out>
            <!-- Send the messages where they have been sent (i.e. implicit To EPR) \
-->  <send/>
        </out>
    </sequence>

    <sequence name="errorHandler">

        <makefault>
            <code value="tns:Receiver" \
xmlns:tns="http://www.w3.org/2003/05/soap-envelope"/>  <reason value="COULDN'T SEND \
THE MESSAGE TO THE SERVER."/>  </makefault>

        <header name="To" action="remove"/>
        <property name="RESPONSE" value="true"/>

        <send/>
    </sequence>

</definitions>

I have checked the load balance with session affinity (sample 54) and it works. But \
Needs more testing ... I will do it and resolve this issue at later (as soon as \
possible)

Thanks
Indika

> Now with support for clustering, Load balanced endpoints should handle sessions \
>                 with awareness of the cluster
> -------------------------------------------------------------------------------------------------------------
>  
> Key: ESBJAVA-439
> URL: https://wso2.org/jira/browse/ESBJAVA-439
> Project: WSO2 ESB
> Issue Type: Improvement
> Affects Versions: 1.6
> Reporter: Asankha Perera
> Assignee: indika kumara
> Fix For: 1.7
> 
> 


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