| Cluster | Represent a logical helix cluster |
| Controller | A helix controller |
| HelixVersion | Helix version (e.g. |
| Participant | A cluster participant |
| Partition | A partition of a resource |
| Resource | Represent a resource entity in helix cluster |
| RunningInstance | A running attributes of a helix instance |
| Scope<T extends Id> | Represents the scope of an object. |
| Spectator | A cluster spectator that listen on cluster changes |
| State | A state in a state model managed by Helix |