@InterfaceAudience.Private
| Interface | Description | 
|---|---|
| HSAdminProtocol | |
| HSAdminRefreshProtocol | |
| HSAdminRefreshProtocolPB | |
| HSClientProtocol | |
| HSClientProtocolPB | |
| MRClientProtocol | |
| MRClientProtocolPB | 
| Class | Description | 
|---|---|
| MRDelegationTokenIdentifier | TokenIdentifierthat identifies delegation tokens 
 issued by JobHistoryServer to delegate
 MR tasks talking to the JobHistoryServer. | 
| MRDelegationTokenIdentifier.Renewer | 
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