LOCALITY AND TIME BASED DEPENDENCY RELATIONSHIPS IN CLUSTERS

摘要

A method, apparatus, and system are directed toward configuring a dependency relationship between resources in a cluster. A dependency relationship between a dependent in a first resource group and a dependee in a second resource group is declared. The dependency relationship might include a locality based qualifier and/or a time based qualifier. The locality based qualifier includes a Local Node, Any Node, or From Resource Group Affinity relationship. The time based dependency qualifier includes a Strong dependency, Weak dependency, Online Restart dependency, or Offline Restart dependency. The declaration might be made using a graphical user interface, property list, configuration file, or the like. A candidate node on which to activate the first resource group is determined. The dependent is brought online on the candidate node based on whether an instance of the dependee is online on a node specified by the locality based qualifier.

主权项

1. A method for configuring a dependency relationship between resources in a cluster, comprising:
declaring at least one relationship for a dependent resource in a first resource group,
wherein the at least one relationship includes a Local Node dependency relationship between the dependent resource in the first resource group and a first dependee resource in a second resource group, andwherein the at least one relationship further includes an Any Node dependency relationship between the dependent resource in the first resource group and a second dependee resource in the second resource group; determining a candidate node on which to activate the first resource group; satisfying the Local Node dependency relationship for an instance of the dependent resource, if an instance of the first dependee resource is online on the candidate node; and satisfying the Any Node dependency relationship for the instance of the dependent resource, if an instance of the second dependee resource is online on any node in the cluster.