Conductor services
A Conductor service encapsulates business logic and is the part of your instance group that does the actual calculation.
A service can either be part of the instance group or independent. A service is
independent of an instance group when
you manually create a service and select the type as Conductor.
Note: If a
Conductor service that is tied to an instance group is removed outside the process
of unregistering an instance group,
the other services that are part of the instance group are stopped; and the instance group moves into the
Register Error state.
Stateful versus stateless
Conductor services can
have one of the following stateful types:
| Stateful type | Description |
|---|---|
| Stateful | A Conductor service that typically stores data locally to a disk on the host that it runs on. IBM® Spectrum Conductor aims to keep the service running on that host, and optionally enables decommissioning of the service to properly handle the data for that service when it is removed. |
| Stateless | A Conductor service that does not store data locally on the host that is runs on. A stateless service can be safely restarted on a different host if necessary. By default, all Conductor services are stateless. |
Service profile
The service profile is a XML file that defines service behavior.
It provides the information IBM Spectrum Conductor needs to run EGO and Conductor services that are managed by the EGO Service Controller.
Every service, whether it is installed by default (a system service) or added by an administrator, has a service profile. When you register a service, you are registering the service profile that contains the service definition. It is good practice to edit the service profile through the cluster management console.
The service profile enables you to configure such properties as:
- The maximum and minimum number of service instances required by the service.
- A service description, which describes how to start a service instance for this service.
- Any resources required to run the service instances for this service.
- Any dependencies this service has (such as another service being started).
Note: Do not change the XML file for any of the system services (those installed by default)
unless specifically told to do so. You may, however, need to change ports.