# Package org.apache.storm.cluster

- Interface Summary
  Interface | Description
  --- | ---
  ClusterStateListener |
  IStateStorage | StateStorage provides the API for the pluggable state store used by the Storm daemons.
  IStormClusterState |
  StateStorageFactory |

- Class Summary
  Class | Description
  --- | ---
  ClusterStateContext | This class is intended to provide runtime-context to StateStorageFactory implementors, giving information such as what daemon is creating it.
  ClusterUtils |
  ExecutorBeat |
  PaceMakerStateStorage |
  PaceMakerStateStorageFactory |
  StormClusterStateImpl |
  VersionedData<D> |
  ZKStateStorage |
  ZKStateStorageFactory |

- Enum Summary
  Enum | Description
  --- | ---
  ConnectionState |
  DaemonType | The type of process/daemon that this server is running as.