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InterDatanodeProtocol.proto
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Tue, Feb 25, 21:11

InterDatanodeProtocol.proto
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/**
* 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 http://wiki.apache.org/hadoop/Compatibility
* for what changes are allowed for a *stable* .proto interface.
*/
// This file contains protocol buffers that are used throughout HDFS -- i.e.
// by the client, server, and data transfer protocols.
option java_package = "org.apache.hadoop.hdfs.protocol.proto";
option java_outer_classname = "InterDatanodeProtocolProtos";
option java_generic_services = true;
option java_generate_equals_and_hash = true;
package hadoop.hdfs;
import "hdfs.proto";
/**
* Block with location information and new generation stamp
* to be used for recovery.
*/
message InitReplicaRecoveryRequestProto {
required RecoveringBlockProto block = 1;
}
/**
* Repica recovery information
*/
message InitReplicaRecoveryResponseProto {
required bool replicaFound = 1;
// The following entries are not set if there was no replica found.
optional ReplicaStateProto state = 2; // State of the replica
optional BlockProto block = 3; // block information
}
/**
* Update replica with new generation stamp and length
*/
message UpdateReplicaUnderRecoveryRequestProto {
required ExtendedBlockProto block = 1; // Block identifier
required uint64 recoveryId = 2; // New genstamp of the replica
required uint64 newLength = 3; // New length of the replica
}
/**
* Response returns updated block information
*/
message UpdateReplicaUnderRecoveryResponseProto {
optional string storageUuid = 1; // ID of the storage that stores replica
}
/**
* Protocol used between datanodes for block recovery.
*
* See the request and response for details of rpc call.
*/
service InterDatanodeProtocolService {
/**
* Initialize recovery of a replica
*/
rpc initReplicaRecovery(InitReplicaRecoveryRequestProto)
returns(InitReplicaRecoveryResponseProto);
/**
* Update a replica with new generation stamp and length
*/
rpc updateReplicaUnderRecovery(UpdateReplicaUnderRecoveryRequestProto)
returns(UpdateReplicaUnderRecoveryResponseProto);
}

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