Changing Method Code

If you change only the method code in a resource type, you must determine whether the new method code is compatible with the old method code. The answer to this question determines whether the new method code must be stored in a new path or whether the old methods can be overwritten.

If you can apply the new Stop, Postnet_stop, and Fini methods (if declared) to resources that were initialized or started by the old versions of the Start, Prenet_stop, or Init methods, the old methods can be overwritten with the new methods.

If applying a new default value to a property causes a method such as Stop, Postnet_stop, or Fini to fail, the cluster administrator must accordingly restrict the state of the resource when the resource type is upgraded.

You enable the cluster administrator to restrict the state of the resource when it is upgraded by limiting the tunability of the Type_version property.

One approach to packaging is to include all earlier versions of a resource type that are still supported in the package. This approach permits the new version of a package to replace the old version of the package, without overwriting or deleting the old paths to the methods. You must decide the number of previous versions to support.