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| |
| <document> |
| <properties> |
| <title>Apache Synapse - Sample 59</title> |
| </properties> |
| <body> |
| <section name="Sample 59: Weighted Round-Robin loadbalancing between 3 endpoints"> |
| <div class="xmlConf"><?xml version="1.0" encoding="UTF-8"?> |
| <definitions xmlns="http://ws.apache.org/ns/synapse"> |
| <sequence name="main" onError="errorHandler"> |
| <in> |
| <send> |
| <endpoint> |
| <loadbalance |
| algorithm="org.apache.synapse.endpoints.algorithms.WeightedRoundRobin"> |
| <endpoint> |
| <address uri="http://localhost:9001/services/LBService1"> |
| <enableAddressing/> |
| <suspendOnFailure> |
| <initialDuration>20000</initialDuration> |
| <progressionFactor>1.0</progressionFactor> |
| </suspendOnFailure> |
| </address> |
| <property name="loadbalance.weight" value="1"/> |
| </endpoint> |
| <endpoint> |
| <address uri="http://localhost:9002/services/LBService1"> |
| <enableAddressing/> |
| <suspendOnFailure> |
| <initialDuration>20000</initialDuration> |
| <progressionFactor>1.0</progressionFactor> |
| </suspendOnFailure> |
| </address> |
| <property name="loadbalance.weight" value="2"/> |
| </endpoint> |
| <endpoint> |
| <address uri="http://localhost:9003/services/LBService1"> |
| <enableAddressing/> |
| <suspendOnFailure> |
| <initialDuration>20000</initialDuration> |
| <progressionFactor>1.0</progressionFactor> |
| </suspendOnFailure> |
| </address> |
| <property name="loadbalance.weight" value="3"/> |
| </endpoint> |
| </loadbalance> |
| </endpoint> |
| </send> |
| <drop/> |
| </in> |
| <out> |
| <send/> |
| </out> |
| </sequence> |
| <sequence name="errorHandler"> |
| <makefault response="true"> |
| <code xmlns:tns="http://www.w3.org/2003/05/soap-envelope" value="tns:Receiver"/> |
| <reason value="COULDN'T SEND THE MESSAGE TO THE SERVER."/> |
| </makefault> |
| <send/> |
| </sequence> |
| </definitions></div> |
| <subsection name="Objective"> |
| <p> |
| Objective: Demonstrate the weighted load balancing among a set of |
| endpoints |
| </p> |
| </subsection> |
| <subsection name="Pre-requisites"> |
| <p> |
| <ul> |
| <li>Start ESB with sample configuration 59. (i.e. wso2esb-samples -sn 59) </li> |
| |
| <li>Deploy the LoadbalanceFailoverService and start three instances of sample Axis2 server as mentioned in sample 52.</li> |
| |
| <li>Above configuration sends messages with the weighted loadbalance behaviour. Weight of each leaf |
| address endpoint is defined by integer value of "loadbalance.weight" property associated with each endpoint. |
| If weight of a endpoint is x, x number of requests will send to that endpoint before switch to next active endpoint. |
| <br/>To test this, run the loadbalancefailover client to send 100 requests as follows: </li> |
| </ul> |
| </p> |
| </subsection> |
| <subsection name="Executing the Client"> |
| <p> |
| Invoke the sample client as follows |
| </p> |
| <div class="command">ant loadbalancefailover -Di=100</div> |
| <p>This client sends 100 requests to the LoadbalanceFailoverService through |
| ESB. ESB will distribute the load among the three endpoints mentioned in the |
| configuration in weighted round-robin manner. LoadbalanceFailoverService appends the |
| name of the server to the response, so that client can determine which server |
| has processed the message. If you examine the console output of the client, |
| you can see that requests are processed by three servers as follows: </p> |
| <div class="consoleOutput">[java] Request: 1 ==> Response from server: MyServer1 |
| [java] Request: 2 ==> Response from server: MyServer2 |
| [java] Request: 3 ==> Response from server: MyServer2 |
| [java] Request: 4 ==> Response from server: MyServer3 |
| [java] Request: 5 ==> Response from server: MyServer3 |
| [java] Request: 6 ==> Response from server: MyServer3 |
| [java] Request: 7 ==> Response from server: MyServer1 |
| [java] Request: 8 ==> Response from server: MyServer2 |
| [java] Request: 9 ==> Response from server: MyServer2 |
| [java] Request: 10 ==> Response from server: MyServer3 |
| [java] Request: 11 ==> Response from server: MyServer3 |
| [java] Request: 12 ==> Response from server: MyServer3 |
| ... |
| </div> |
| <p>As logs, endpoint with weight 1 received a 1 request and endpoint with weight 2 received 2 |
| requests and etc... in a cycle</p> |
| </subsection> |
| </section> |
| <p> |
| <a href="../samples.html">Back to Catalog</a> |
| </p> |
| </body> |
| </document> |
