| Name | Type | Package | Detail |
| HAServiceProtocolHelper | Class | hadoop.ha | Detail |
| HAServiceProtocolPB | Interface | ha.protocolPB | Detail |
| ProtocolTypes | Interface | client.types | Detail |
| TraceAdminProtocolPB | Interface | hadoop.tracing | Detail |
| ZKFCProtocolPB | Interface | ha.protocolPB | Detail |
