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• Thrift IDL file for TCLIService: <BaseDir>/service-rpc/if/TCLIService.thrift (<BaseDir> is typically: <YourWorkspace>/hive/) 
• TCLIService.Iface implemented by: org.apache.hive.service.cli.thrift.ThriftCLIService class 
• ThriftCLIService subclassed by: org.apache.hive.service.cli.thrift.ThriftBinaryCLIService and org.apache.hive.service.cli.thrift.ThriftHttpCLIService for TCP mode and HTTP mode respectively.

• org.apache.hive.service.cli.session.HiveSessionImpl class: Hive session instances Instance of this class are created on server side and managed by org.apache.accumulo.tserver.TabletServer.SessionManager instance.

• org.apache.hive.service.cli.SessionHandle class: returned instances of this class are returned from server to client and used by client for as input for Thrift API calls.

• org.apache.hive.service.cli.operation.Operation class: defines operations that an operation (e.g. a query). Instances of this class are created on server and managed by org.apache.hive.service.cli.operation.OperationManager instance.
• org.apache.hive.service.cli.OperationHandle class: defines the operation handles that handle which is part of Operation and used to uniquely identify the operationas a operation identifier. It's used on by Thrift client side to poll the execution status of a long running an operation (e.g. a query). 
• org.apache.hive.service.auth.HiveAuthFactory class: a helper used by both HTTP and TCP mode for authenticationsauthentication. Refer to Setting Up HiveServer2 for various auth options.

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