| Class | Description | 
|---|---|
| AMRMTokenSecretManagerState | Contains all the state data that needs to be stored persistently 
 for  AMRMTokenSecretManager | 
| ApplicationAttemptStateData | |
| ApplicationStateData | Contains all the state data that needs to be stored persistently 
 for an Application | 
| Epoch | The epoch information of RM for work-preserving restart. | 
| RMDelegationTokenIdentifierData | 
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