| /** |
| * 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. |
| */ |
| package org.apache.hadoop.hdfs.protocol.datatransfer; |
| |
| import static org.apache.hadoop.hdfs.protocol.HdfsProtoUtil.fromProto; |
| import static org.apache.hadoop.hdfs.protocol.HdfsProtoUtil.fromProtos; |
| import static org.apache.hadoop.hdfs.protocol.HdfsProtoUtil.vintPrefixed; |
| import static org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil.fromProto; |
| |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.hdfs.protocol.DatanodeInfo; |
| import org.apache.hadoop.hdfs.protocol.ExtendedBlock; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpBlockChecksumProto; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpCopyBlockProto; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpReadBlockProto; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpReplaceBlockProto; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpTransferBlockProto; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpWriteBlockProto; |
| import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier; |
| import org.apache.hadoop.security.token.Token; |
| |
| /** Receiver */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Evolving |
| public abstract class Receiver { |
| /** Read an Op. It also checks protocol version. */ |
| protected final Op readOp(DataInputStream in) throws IOException { |
| final short version = in.readShort(); |
| if (version != DataTransferProtocol.DATA_TRANSFER_VERSION) { |
| throw new IOException( "Version Mismatch (Expected: " + |
| DataTransferProtocol.DATA_TRANSFER_VERSION + |
| ", Received: " + version + " )"); |
| } |
| return Op.read(in); |
| } |
| |
| /** Process op by the corresponding method. */ |
| protected final void processOp(Op op, DataInputStream in |
| ) throws IOException { |
| switch(op) { |
| case READ_BLOCK: |
| opReadBlock(in); |
| break; |
| case WRITE_BLOCK: |
| opWriteBlock(in); |
| break; |
| case REPLACE_BLOCK: |
| opReplaceBlock(in); |
| break; |
| case COPY_BLOCK: |
| opCopyBlock(in); |
| break; |
| case BLOCK_CHECKSUM: |
| opBlockChecksum(in); |
| break; |
| case TRANSFER_BLOCK: |
| opTransferBlock(in); |
| break; |
| default: |
| throw new IOException("Unknown op " + op + " in data stream"); |
| } |
| } |
| |
| /** Receive OP_READ_BLOCK */ |
| private void opReadBlock(DataInputStream in) throws IOException { |
| OpReadBlockProto proto = OpReadBlockProto.parseFrom(vintPrefixed(in)); |
| |
| ExtendedBlock b = fromProto( |
| proto.getHeader().getBaseHeader().getBlock()); |
| Token<BlockTokenIdentifier> token = fromProto( |
| proto.getHeader().getBaseHeader().getToken()); |
| |
| opReadBlock(in, b, proto.getOffset(), proto.getLen(), |
| proto.getHeader().getClientName(), token); |
| } |
| /** |
| * Abstract OP_READ_BLOCK method. Read a block. |
| */ |
| protected abstract void opReadBlock(DataInputStream in, ExtendedBlock blk, |
| long offset, long length, String client, |
| Token<BlockTokenIdentifier> blockToken) throws IOException; |
| |
| /** Receive OP_WRITE_BLOCK */ |
| private void opWriteBlock(DataInputStream in) throws IOException { |
| final OpWriteBlockProto proto = OpWriteBlockProto.parseFrom(vintPrefixed(in)); |
| opWriteBlock(in, |
| fromProto(proto.getHeader().getBaseHeader().getBlock()), |
| proto.getPipelineSize(), |
| fromProto(proto.getStage()), |
| proto.getLatestGenerationStamp(), |
| proto.getMinBytesRcvd(), proto.getMaxBytesRcvd(), |
| proto.getHeader().getClientName(), |
| fromProto(proto.getSource()), |
| fromProtos(proto.getTargetsList()), |
| fromProto(proto.getHeader().getBaseHeader().getToken())); |
| } |
| |
| /** |
| * Abstract OP_WRITE_BLOCK method. |
| * Write a block. |
| */ |
| protected abstract void opWriteBlock(DataInputStream in, ExtendedBlock blk, |
| int pipelineSize, BlockConstructionStage stage, long newGs, |
| long minBytesRcvd, long maxBytesRcvd, String client, DatanodeInfo src, |
| DatanodeInfo[] targets, Token<BlockTokenIdentifier> blockToken) |
| throws IOException; |
| |
| /** Receive {@link Op#TRANSFER_BLOCK} */ |
| private void opTransferBlock(DataInputStream in) throws IOException { |
| final OpTransferBlockProto proto = |
| OpTransferBlockProto.parseFrom(vintPrefixed(in)); |
| |
| opTransferBlock(in, |
| fromProto(proto.getHeader().getBaseHeader().getBlock()), |
| proto.getHeader().getClientName(), |
| fromProtos(proto.getTargetsList()), |
| fromProto(proto.getHeader().getBaseHeader().getToken())); |
| } |
| |
| /** |
| * Abstract {@link Op#TRANSFER_BLOCK} method. |
| * For {@link BlockConstructionStage#TRANSFER_RBW} |
| * or {@link BlockConstructionStage#TRANSFER_FINALIZED}. |
| */ |
| protected abstract void opTransferBlock(DataInputStream in, ExtendedBlock blk, |
| String client, DatanodeInfo[] targets, |
| Token<BlockTokenIdentifier> blockToken) |
| throws IOException; |
| |
| /** Receive OP_REPLACE_BLOCK */ |
| private void opReplaceBlock(DataInputStream in) throws IOException { |
| OpReplaceBlockProto proto = OpReplaceBlockProto.parseFrom(vintPrefixed(in)); |
| |
| opReplaceBlock(in, |
| fromProto(proto.getHeader().getBlock()), |
| proto.getDelHint(), |
| fromProto(proto.getSource()), |
| fromProto(proto.getHeader().getToken())); |
| } |
| |
| /** |
| * Abstract OP_REPLACE_BLOCK method. |
| * It is used for balancing purpose; send to a destination |
| */ |
| protected abstract void opReplaceBlock(DataInputStream in, |
| ExtendedBlock blk, String delHint, DatanodeInfo src, |
| Token<BlockTokenIdentifier> blockToken) throws IOException; |
| |
| /** Receive OP_COPY_BLOCK */ |
| private void opCopyBlock(DataInputStream in) throws IOException { |
| OpCopyBlockProto proto = OpCopyBlockProto.parseFrom(vintPrefixed(in)); |
| |
| opCopyBlock(in, |
| fromProto(proto.getHeader().getBlock()), |
| fromProto(proto.getHeader().getToken())); |
| } |
| |
| /** |
| * Abstract OP_COPY_BLOCK method. It is used for balancing purpose; send to |
| * a proxy source. |
| */ |
| protected abstract void opCopyBlock(DataInputStream in, ExtendedBlock blk, |
| Token<BlockTokenIdentifier> blockToken) |
| throws IOException; |
| |
| /** Receive OP_BLOCK_CHECKSUM */ |
| private void opBlockChecksum(DataInputStream in) throws IOException { |
| OpBlockChecksumProto proto = OpBlockChecksumProto.parseFrom(vintPrefixed(in)); |
| |
| opBlockChecksum(in, |
| fromProto(proto.getHeader().getBlock()), |
| fromProto(proto.getHeader().getToken())); |
| } |
| |
| /** |
| * Abstract OP_BLOCK_CHECKSUM method. |
| * Get the checksum of a block |
| */ |
| protected abstract void opBlockChecksum(DataInputStream in, |
| ExtendedBlock blk, Token<BlockTokenIdentifier> blockToken) |
| throws IOException; |
| } |