The Failover Load Balancing Algorithm is a fail-over load balancing algorithm.
A fail-over load balancing algorithm sends all the requests to one route. Each load balancing route is assigned a priority. A priority is an integer value where 0 is the top priority. The algorithm chooses the route with the highest priority and sends all the requests to that route. When the route is down, the algorithm chooses another route with the highest priority and sends all the requests to that new route. When the first route is back on-line, the algorithm does not switch back to the first route, unless the flag "switch-back" has been set to true. In case two routes have the same priority, the algorithm chooses one and the election is not deterministic.
The Failover Load Balancing Algorithm component inherits from the Load Balancing Algorithm
This page describes the Failover Load Balancing Algorithm:
A description of each property follows.
| Basic Properties: | Advanced Properties: |
|---|---|
| None | ↓ java-class |
| ↓ switch-back |
| Description | Specifies the fully-qualified name of the Java class that provides the Failover Load Balancing Algorithm implementation. |
| Default Value | com.sun.dps.server.workflowelement.loadbalancing.FailoverLoadBalancingAlgorithm |
| Allowed Values | A java class that implements or extends the class(es) : com.sun.dps.server.workflowelement.loadbalancing.AbstractLoadBalancingAlgorithm |
| Multi-valued | No |
| Required | Yes |
| Admin Action Required | None |
| Advanced Property | Yes |
| Read-only | No |
| Description | This flag tells what to do when a route is back on-line. Assuming the algorithm is using a route R2, if another route R1 is back on-line and R1 has a higher priority than R2 then the algorithm will not switch back to R1, unless the flag "switch-back" has been set to true. |
| Default Value | false |
| Allowed Values | true false |
| Multi-valued | No |
| Required | No |
| Admin Action Required | None |
| Advanced Property | Yes |
| Read-only | No |
Each configuration property can be mapped to a specific LDAP attribute under the "cn=config" entry. The mappings that follow are provided for information only. In general, you should avoid changing the server configuration by manipulating the LDAP attributes directly.
| Base DN | cn=algorithm |
| objectclass name | ds-cfg-fail-over-load-balancing-algorithm |
| objectclass superior | ds-cfg-load-balancing-algorithm |
| Property | LDAP attribute |
| java-class | ds-cfg-java-class |
| switch-back | ds-cfg-fail-over-load-balancing-switch-back |