/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* These .proto interfaces are private and stable.
* Please see https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/Compatibility.html
* for what changes are allowed for a *stable* .proto interface.
*/
syntax = "proto2";
/**
* These are the messages used by Hadoop RPC for the Rpc Engine Protocol Buffer
* to marshal the request and response in the RPC layer.
* The messages are sent in addition to the normal RPC header as
* defined in RpcHeader.proto
*/
option java_package = "org.apache.hadoop.ipc.protobuf";
option java_outer_classname = "ProtobufRpcEngine2Protos";
option java_generate_equals_and_hash = true;
package hadoop.common;
/**
* This message is the header for the Protobuf Rpc Engine
* when sending a RPC request from RPC client to the RPC server.
* The actual request (serialized as protobuf) follows this request.
*
* No special header is needed for the Rpc Response for Protobuf Rpc Engine.
* The normal RPC response header (see RpcHeader.proto) are sufficient.
*/
message RequestHeaderProto {
/** Name of the RPC method */
required string methodName = 1;
/**
* RPCs for a particular interface (ie protocol) are done using a
* IPC connection that is setup using rpcProxy.
* The rpcProxy's has a declared protocol name that is
* sent form client to server at connection time.
*
* Each Rpc call also sends a protocol name
* (called declaringClassprotocolName). This name is usually the same
* as the connection protocol name except in some cases.
* For example metaProtocols such ProtocolInfoProto which get metainfo
* about the protocol reuse the connection but need to indicate that
* the actual protocol is different (i.e. the protocol is
* ProtocolInfoProto) since they reuse the connection; in this case
* the declaringClassProtocolName field is set to the ProtocolInfoProto
*/
required string declaringClassProtocolName = 2;
/** protocol version of class declaring the called method */
required uint64 clientProtocolVersion = 3;
/** protocol extensions */
extensions 1000 to max;
}