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ClientDatanodeProtocol.proto
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Tue, Feb 25, 21:55

ClientDatanodeProtocol.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 = "ClientDatanodeProtocolProtos";
option java_generic_services = true;
option java_generate_equals_and_hash = true;
package hadoop.hdfs;
import "Security.proto";
import "hdfs.proto";
/**
* block - block for which visible length is requested
*/
message GetReplicaVisibleLengthRequestProto {
required ExtendedBlockProto block = 1;
}
/**
* length - visible length of the block
*/
message GetReplicaVisibleLengthResponseProto {
required uint64 length = 1;
}
/**
* void request
*/
message RefreshNamenodesRequestProto {
}
/**
* void response
*/
message RefreshNamenodesResponseProto {
}
/**
* blockPool - block pool to be deleted
* force - if false, delete the block pool only if it is empty.
* if true, delete the block pool even if it has blocks.
*/
message DeleteBlockPoolRequestProto {
required string blockPool = 1;
required bool force = 2;
}
/**
* void response
*/
message DeleteBlockPoolResponseProto {
}
/**
* Gets the file information where block and its metadata is stored
* block - block for which path information is being requested
* token - block token
*
* This message is deprecated in favor of file descriptor passing.
*/
message GetBlockLocalPathInfoRequestProto {
required ExtendedBlockProto block = 1;
required hadoop.common.TokenProto token = 2;
}
/**
* block - block for which file path information is being returned
* localPath - file path where the block data is stored
* localMetaPath - file path where the block meta data is stored
*
* This message is deprecated in favor of file descriptor passing.
*/
message GetBlockLocalPathInfoResponseProto {
required ExtendedBlockProto block = 1;
required string localPath = 2;
required string localMetaPath = 3;
}
/**
* blocks - list of ExtendedBlocks on which we are querying additional info
* tokens - list of access tokens corresponding to list of ExtendedBlocks
*/
message GetHdfsBlockLocationsRequestProto {
repeated ExtendedBlockProto blocks = 1;
repeated hadoop.common.TokenProto tokens = 2;
}
/**
* volumeIds - id of each volume, potentially multiple bytes
* volumeIndexes - for each block, an index into volumeIds specifying the volume
* on which it is located. If block is not present on any volume,
* index is set to MAX_INT.
*/
message GetHdfsBlockLocationsResponseProto {
repeated bytes volumeIds = 1;
repeated uint32 volumeIndexes = 2;
}
/**
* Protocol used from client to the Datanode.
* See the request and response for details of rpc call.
*/
service ClientDatanodeProtocolService {
/**
* Returns the visible length of the replica
*/
rpc getReplicaVisibleLength(GetReplicaVisibleLengthRequestProto)
returns(GetReplicaVisibleLengthResponseProto);
/**
* Refresh the list of federated namenodes from updated configuration.
* Adds new namenodes and stops the deleted namenodes.
*/
rpc refreshNamenodes(RefreshNamenodesRequestProto)
returns(RefreshNamenodesResponseProto);
/**
* Delete the block pool from the datanode.
*/
rpc deleteBlockPool(DeleteBlockPoolRequestProto)
returns(DeleteBlockPoolResponseProto);
/**
* Retrieves the path names of the block file and metadata file stored on the
* local file system.
*/
rpc getBlockLocalPathInfo(GetBlockLocalPathInfoRequestProto)
returns(GetBlockLocalPathInfoResponseProto);
/**
* Retrieve additional HDFS-specific metadata about a set of blocks stored
* on the local file system.
*/
rpc getHdfsBlockLocations(GetHdfsBlockLocationsRequestProto)
returns(GetHdfsBlockLocationsResponseProto);
}

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