Non-fatal Rpc error - connection left open for future rpc calls.

Fatal Server side Rpc error - connection closed.

* Refresh request.

* Collection of responses from zero or more handlers.

* A single response from a refresh handler.

* Get groups for user request.

* Response for get groups.

* Get protocol signature request.

* Get protocol signature response.

* Request to get protocol versions for all supported rpc kinds.

* Get protocol version response.

* void request.

* Returns the state of the service.

* The connection context is sent as part of the connection establishment.

* void request.

* void response.

* Protocol version with corresponding rpc kind.

* Refresh callqueue request.

* void response.

* Refresh service acl request.

* void response.

* Refresh superuser configuration request.

* void response.

* Refresh user to group mappings request.

* void response.

* This message is the header for the Protobuf Rpc Engine when sending a RPC request from RPC client to the RPC server.

* Used to pass through the call context entry after an RPC is made.

* Rpc Response Header +------------------------------------------------------------------+ | Rpc total response length in bytes (4 bytes int) | | (sum of next two parts) | +------------------------------------------------------------------+ | RpcResponseHeaderProto - serialized delimited ie has len | +------------------------------------------------------------------+ | if request is successful: | | - RpcResponse - The actual rpc response bytes follow | | the response header | | This response is serialized based on RpcKindProto | | if request fails : | | The rpc response header contains the necessary info | +------------------------------------------------------------------+ Note that rpc response header is also used when connection setup fails.

* Used to pass through the information necessary to continue a trace after an RPC is made.

* Security token identifier.

* void request.

* void response.

* void request.

* void response.

* Spec for UserInformationProto is specified in ProtoUtil#makeIpcConnectionContext.

* RpcKind determine the rpcEngine and the serialization of the rpc request.