balancer
Description
Performs load-balancing between several nodes. Nodes sharing session state may be bundled into a cluster.
Can be used in
spring:beans, if, internalProxy, proxy, registration, request, response, serviceProxy, soapProxy, stompProxy, swaggerProxy, transport and wsStompReassembler
Syntax
<serviceProxy port="9000"> <adminConsole readOnly="[true, false]" /> </serviceProxy>
Listing 12: adminConsole Example
Sample
<serviceProxy port="2000"> <balancer> <xmlSessionIdExtractor namespace="http://chat.predic8.com/" localName="session" /> <clusters> <cluster name="Default"> <node host="node1.predic8.com" port="8080" /> <node host="node2.predic8.com" port="8090" /> <node host="node3.predic8.com" port="8100" /> <cluster> </clusters> <byThreadStrategy maxNumberOfThreadsPerEndpoint="10" retryTimeOnBusy="1000" /> </balancer> </serviceProxy>
Listing 12: balancer Example
Attributes
| Name | Required | Default | Description | Example |
|---|---|---|---|---|
| name | false | Default | Uniquely identifies this Load Balancer, if there is more than one. Used in the web administration interface and lbclient to manage nodes. | balancer1 |
| sessionTimeout | false | 3600000 | Time in milliseconds after which sessions time out. (If a session extractor is used.) Default is 1 hour, 0 means never. | 600000 (10min) |
Explanation
Child Elements
| Position | Cardinality | Description | Element |
|---|---|---|---|
| 1 | 0..1 | Sets the strategy used to extract a session ID from incoming HTTP requests. | jSessionIdExtractor or xmlSessionIdExtractor |
| 2 | 0..* | Specifies a list of clusters. | clusters |
| 3 | 0..1 | Sets the strategy used to choose the backend nodes. | byThreadStrategy, faultMonitoringStrategy or roundRobinStrategy |
| 4 | 0..1 | Checks if nodes are still available. Sets them to "DOWN" when not reachable, else sets them back up when they are reachable. | nodeOnlineChecker |