Java ReadOpChecksumInfoProto类代码示例

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本文整理汇总了Java中org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto类的典型用法代码示例。如果您正苦于以下问题：Java ReadOpChecksumInfoProto类的具体用法？Java ReadOpChecksumInfoProto怎么用？Java ReadOpChecksumInfoProto使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。

ReadOpChecksumInfoProto类属于org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos包，在下文中一共展示了ReadOpChecksumInfoProto类的11个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的Java代码示例。

示例1: writeSuccessWithChecksumInfo

import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto; //导入依赖的package包/类
private void writeSuccessWithChecksumInfo(BlockSender blockSender,
    DataOutputStream out) throws IOException {

  ReadOpChecksumInfoProto ckInfo = ReadOpChecksumInfoProto.newBuilder()
    .setChecksum(DataTransferProtoUtil.toProto(blockSender.getChecksum()))
    .setChunkOffset(blockSender.getOffset())
    .build();
    
  BlockOpResponseProto response = BlockOpResponseProto.newBuilder()
    .setStatus(SUCCESS)
    .setReadOpChecksumInfo(ckInfo)
    .build();
  response.writeDelimitedTo(out);
  out.flush();
}

开发者ID:naver，项目名称:hadoop，代码行数:16，代码来源:DataXceiver.java

示例2: newBlockReader

import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto; //导入依赖的package包/类
/**
 * Create a new BlockReader specifically to satisfy a read.
 * This method also sends the OP_READ_BLOCK request.
 *
 * @param sock
 *     An established Socket to the DN. The BlockReader will not close it
 *     normally
 * @param file
 *     File location
 * @param block
 *     The block object
 * @param blockToken
 *     The block token for security
 * @param startOffset
 *     The read offset, relative to block head
 * @param len
 *     The number of bytes to read
 * @param bufferSize
 *     The IO buffer size (not the client buffer size)
 * @param verifyChecksum
 *     Whether to verify checksum
 * @param clientName
 *     Client name
 * @return New BlockReader instance, or null on error.
 */
public static RemoteBlockReader newBlockReader(Socket sock, String file,
    ExtendedBlock block, Token<BlockTokenIdentifier> blockToken,
    long startOffset, long len, int bufferSize, boolean verifyChecksum,
    String clientName) throws IOException {
  // in and out will be closed when sock is closed (by the caller)
  final DataOutputStream out = new DataOutputStream(new BufferedOutputStream(
      NetUtils.getOutputStream(sock, HdfsServerConstants.WRITE_TIMEOUT)));
  new Sender(out).readBlock(block, blockToken, clientName, startOffset, len,
      verifyChecksum);
  
  //
  // Get bytes in block, set streams
  //

  DataInputStream in = new DataInputStream(
      new BufferedInputStream(NetUtils.getInputStream(sock), bufferSize));
  
  BlockOpResponseProto status =
      BlockOpResponseProto.parseFrom(PBHelper.vintPrefixed(in));
  RemoteBlockReader2.checkSuccess(status, sock, block, file);
  ReadOpChecksumInfoProto checksumInfo = status.getReadOpChecksumInfo();
  DataChecksum checksum =
      DataTransferProtoUtil.fromProto(checksumInfo.getChecksum());
  //Warning when we get CHECKSUM_NULL?
  
  // Read the first chunk offset.
  long firstChunkOffset = checksumInfo.getChunkOffset();
  
  if (firstChunkOffset < 0 || firstChunkOffset > startOffset ||
      firstChunkOffset <= (startOffset - checksum.getBytesPerChecksum())) {
    throw new IOException("BlockReader: error in first chunk offset (" +
        firstChunkOffset + ") startOffset is " +
        startOffset + " for file " + file);
  }

  return new RemoteBlockReader(file, block.getBlockPoolId(),
      block.getBlockId(), in, checksum, verifyChecksum, startOffset,
      firstChunkOffset, len, sock);
}

开发者ID:hopshadoop，项目名称:hops，代码行数:65，代码来源:RemoteBlockReader.java

示例3: writeSuccessWithChecksumInfo

import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto; //导入依赖的package包/类
private void writeSuccessWithChecksumInfo(BlockSender blockSender,
    DataOutputStream out) throws IOException {

  ReadOpChecksumInfoProto ckInfo = ReadOpChecksumInfoProto.newBuilder()
      .setChecksum(DataTransferProtoUtil.toProto(blockSender.getChecksum()))
      .setChunkOffset(blockSender.getOffset()).build();

  BlockOpResponseProto response =
      BlockOpResponseProto.newBuilder().setStatus(SUCCESS)
          .setReadOpChecksumInfo(ckInfo).build();
  response.writeDelimitedTo(out);
  out.flush();
}

开发者ID:hopshadoop，项目名称:hops，代码行数:14，代码来源:DataXceiver.java

示例4: newBlockReader

import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto; //导入依赖的package包/类
/**
 * Create a new BlockReader specifically to satisfy a read.
 * This method also sends the OP_READ_BLOCK request.
 *
 * @param file  File location
 * @param block  The block object
 * @param blockToken  The block token for security
 * @param startOffset  The read offset, relative to block head
 * @param len  The number of bytes to read
 * @param bufferSize  The IO buffer size (not the client buffer size)
 * @param verifyChecksum  Whether to verify checksum
 * @param clientName  Client name
 * @return New BlockReader instance, or null on error.
 */
public static RemoteBlockReader newBlockReader(String file,
                                   ExtendedBlock block, 
                                   Token<BlockTokenIdentifier> blockToken,
                                   long startOffset, long len,
                                   int bufferSize, boolean verifyChecksum,
                                   String clientName, Peer peer,
                                   DatanodeID datanodeID,
                                   PeerCache peerCache,
                                   CachingStrategy cachingStrategy)
                                     throws IOException {
  // in and out will be closed when sock is closed (by the caller)
  final DataOutputStream out =
      new DataOutputStream(new BufferedOutputStream(peer.getOutputStream()));
  new Sender(out).readBlock(block, blockToken, clientName, startOffset, len,
      verifyChecksum, cachingStrategy);
  
  //
  // Get bytes in block, set streams
  //

  DataInputStream in = new DataInputStream(
      new BufferedInputStream(peer.getInputStream(), bufferSize));
  
  BlockOpResponseProto status = BlockOpResponseProto.parseFrom(
      PBHelper.vintPrefixed(in));
  RemoteBlockReader2.checkSuccess(status, peer, block, file);
  ReadOpChecksumInfoProto checksumInfo =
    status.getReadOpChecksumInfo();
  DataChecksum checksum = DataTransferProtoUtil.fromProto(
      checksumInfo.getChecksum());
  //Warning when we get CHECKSUM_NULL?
  
  // Read the first chunk offset.
  long firstChunkOffset = checksumInfo.getChunkOffset();
  
  if ( firstChunkOffset < 0 || firstChunkOffset > startOffset ||
      firstChunkOffset <= (startOffset - checksum.getBytesPerChecksum())) {
    throw new IOException("BlockReader: error in first chunk offset (" +
                          firstChunkOffset + ") startOffset is " + 
                          startOffset + " for file " + file);
  }

  return new RemoteBlockReader(file, block.getBlockPoolId(), block.getBlockId(),
      in, checksum, verifyChecksum, startOffset, firstChunkOffset, len,
      peer, datanodeID, peerCache);
}

开发者ID:naver，项目名称:hadoop，代码行数:61，代码来源:RemoteBlockReader.java

示例5: newBlockReader

import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto; //导入依赖的package包/类
/**
 * Create a new BlockReader specifically to satisfy a read.
 * This method also sends the OP_READ_BLOCK request.
 *
 * @param file  File location
 * @param block  The block object
 * @param blockToken  The block token for security
 * @param startOffset  The read offset, relative to block head
 * @param len  The number of bytes to read
 * @param verifyChecksum  Whether to verify checksum
 * @param clientName  Client name
 * @param peer  The Peer to use
 * @param datanodeID  The DatanodeID this peer is connected to
 * @return New BlockReader instance, or null on error.
 */
public static BlockReader newBlockReader(String file,
                                   ExtendedBlock block,
                                   Token<BlockTokenIdentifier> blockToken,
                                   long startOffset, long len,
                                   boolean verifyChecksum,
                                   String clientName,
                                   Peer peer, DatanodeID datanodeID,
                                   PeerCache peerCache,
                                   CachingStrategy cachingStrategy) throws IOException {
  // in and out will be closed when sock is closed (by the caller)
  final DataOutputStream out = new DataOutputStream(new BufferedOutputStream(
        peer.getOutputStream()));
  new Sender(out).readBlock(block, blockToken, clientName, startOffset, len,
      verifyChecksum, cachingStrategy);

  //
  // Get bytes in block
  //
  DataInputStream in = new DataInputStream(peer.getInputStream());

  BlockOpResponseProto status = BlockOpResponseProto.parseFrom(
      PBHelper.vintPrefixed(in));
  checkSuccess(status, peer, block, file);
  ReadOpChecksumInfoProto checksumInfo =
    status.getReadOpChecksumInfo();
  DataChecksum checksum = DataTransferProtoUtil.fromProto(
      checksumInfo.getChecksum());
  //Warning when we get CHECKSUM_NULL?

  // Read the first chunk offset.
  long firstChunkOffset = checksumInfo.getChunkOffset();

  if ( firstChunkOffset < 0 || firstChunkOffset > startOffset ||
      firstChunkOffset <= (startOffset - checksum.getBytesPerChecksum())) {
    throw new IOException("BlockReader: error in first chunk offset (" +
                          firstChunkOffset + ") startOffset is " +
                          startOffset + " for file " + file);
  }

  return new RemoteBlockReader2(file, block.getBlockPoolId(), block.getBlockId(),
      checksum, verifyChecksum, startOffset, firstChunkOffset, len, peer,
      datanodeID, peerCache);
}

开发者ID:naver，项目名称:hadoop，代码行数:59，代码来源:RemoteBlockReader2.java

示例6: newBlockReader

import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto; //导入依赖的package包/类
/**
 * Create a new BlockReader specifically to satisfy a read.
 * This method also sends the OP_READ_BLOCK request.
 *
 * @param file  File location
 * @param block  The block object
 * @param blockToken  The block token for security
 * @param startOffset  The read offset, relative to block head
 * @param len  The number of bytes to read
 * @param bufferSize  The IO buffer size (not the client buffer size)
 * @param verifyChecksum  Whether to verify checksum
 * @param clientName  Client name
 * @return New BlockReader instance, or null on error.
 */
public static RemoteBlockReader newBlockReader(String file,
    ExtendedBlock block,
    Token<BlockTokenIdentifier> blockToken,
    long startOffset, long len,
    int bufferSize, boolean verifyChecksum,
    String clientName, Peer peer,
    DatanodeID datanodeID,
    PeerCache peerCache,
    CachingStrategy cachingStrategy,
    Tracer tracer)
    throws IOException {
  // in and out will be closed when sock is closed (by the caller)
  final DataOutputStream out =
      new DataOutputStream(new BufferedOutputStream(peer.getOutputStream()));
  new Sender(out).readBlock(block, blockToken, clientName, startOffset, len,
      verifyChecksum, cachingStrategy);

  //
  // Get bytes in block, set streams
  //

  DataInputStream in = new DataInputStream(
      new BufferedInputStream(peer.getInputStream(), bufferSize));

  BlockOpResponseProto status = BlockOpResponseProto.parseFrom(
      PBHelperClient.vintPrefixed(in));
  RemoteBlockReader2.checkSuccess(status, peer, block, file);
  ReadOpChecksumInfoProto checksumInfo =
      status.getReadOpChecksumInfo();
  DataChecksum checksum = DataTransferProtoUtil.fromProto(
      checksumInfo.getChecksum());
  //Warning when we get CHECKSUM_NULL?

  // Read the first chunk offset.
  long firstChunkOffset = checksumInfo.getChunkOffset();

  if ( firstChunkOffset < 0 || firstChunkOffset > startOffset ||
      firstChunkOffset <= (startOffset - checksum.getBytesPerChecksum())) {
    throw new IOException("BlockReader: error in first chunk offset (" +
        firstChunkOffset + ") startOffset is " +
        startOffset + " for file " + file);
  }

  return new RemoteBlockReader(file, block.getBlockPoolId(), block.getBlockId(),
      in, checksum, verifyChecksum, startOffset, firstChunkOffset, len,
      peer, datanodeID, peerCache, tracer);
}

开发者ID:aliyun-beta，项目名称:aliyun-oss-hadoop-fs，代码行数:62，代码来源:RemoteBlockReader.java

示例7: newBlockReader

import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto; //导入依赖的package包/类
/**
 * Create a new BlockReader specifically to satisfy a read.
 * This method also sends the OP_READ_BLOCK request.
 *
 * @param file  File location
 * @param block  The block object
 * @param blockToken  The block token for security
 * @param startOffset  The read offset, relative to block head
 * @param len  The number of bytes to read
 * @param verifyChecksum  Whether to verify checksum
 * @param clientName  Client name
 * @param peer  The Peer to use
 * @param datanodeID  The DatanodeID this peer is connected to
 * @return New BlockReader instance, or null on error.
 */
public static BlockReader newBlockReader(String file,
    ExtendedBlock block,
    Token<BlockTokenIdentifier> blockToken,
    long startOffset, long len,
    boolean verifyChecksum,
    String clientName,
    Peer peer, DatanodeID datanodeID,
    PeerCache peerCache,
    CachingStrategy cachingStrategy,
    Tracer tracer) throws IOException {
  // in and out will be closed when sock is closed (by the caller)
  final DataOutputStream out = new DataOutputStream(new BufferedOutputStream(
      peer.getOutputStream()));
  new Sender(out).readBlock(block, blockToken, clientName, startOffset, len,
      verifyChecksum, cachingStrategy);

  //
  // Get bytes in block
  //
  DataInputStream in = new DataInputStream(peer.getInputStream());

  BlockOpResponseProto status = BlockOpResponseProto.parseFrom(
      PBHelperClient.vintPrefixed(in));
  checkSuccess(status, peer, block, file);
  ReadOpChecksumInfoProto checksumInfo =
      status.getReadOpChecksumInfo();
  DataChecksum checksum = DataTransferProtoUtil.fromProto(
      checksumInfo.getChecksum());
  //Warning when we get CHECKSUM_NULL?

  // Read the first chunk offset.
  long firstChunkOffset = checksumInfo.getChunkOffset();

  if ( firstChunkOffset < 0 || firstChunkOffset > startOffset ||
      firstChunkOffset <= (startOffset - checksum.getBytesPerChecksum())) {
    throw new IOException("BlockReader: error in first chunk offset (" +
        firstChunkOffset + ") startOffset is " +
        startOffset + " for file " + file);
  }

  return new RemoteBlockReader2(file, block.getBlockId(), checksum,
      verifyChecksum, startOffset, firstChunkOffset, len, peer, datanodeID,
      peerCache, tracer);
}

开发者ID:aliyun-beta，项目名称:aliyun-oss-hadoop-fs，代码行数:60，代码来源:RemoteBlockReader2.java

示例8: newBlockReader

import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto; //导入依赖的package包/类
/**
 * Create a new BlockReader specifically to satisfy a read.
 * This method also sends the OP_READ_BLOCK request.
 *
 * @param sock  An established Socket to the DN. The BlockReader will not close it normally
 * @param file  File location
 * @param block  The block object
 * @param blockToken  The block token for security
 * @param startOffset  The read offset, relative to block head
 * @param len  The number of bytes to read
 * @param bufferSize  The IO buffer size (not the client buffer size)
 * @param verifyChecksum  Whether to verify checksum
 * @param clientName  Client name
 * @return New BlockReader instance, or null on error.
 */
public static RemoteBlockReader newBlockReader(String file,
                                   ExtendedBlock block, 
                                   Token<BlockTokenIdentifier> blockToken,
                                   long startOffset, long len,
                                   int bufferSize, boolean verifyChecksum,
                                   String clientName, Peer peer,
                                   DatanodeID datanodeID,
                                   PeerCache peerCache,
                                   CachingStrategy cachingStrategy)
                                     throws IOException {
  // in and out will be closed when sock is closed (by the caller)
  final DataOutputStream out =
      new DataOutputStream(new BufferedOutputStream(peer.getOutputStream()));
  new Sender(out).readBlock(block, blockToken, clientName, startOffset, len,
      verifyChecksum, cachingStrategy);
  
  //
  // Get bytes in block, set streams
  //

  DataInputStream in = new DataInputStream(
      new BufferedInputStream(peer.getInputStream(), bufferSize));
  
  BlockOpResponseProto status = BlockOpResponseProto.parseFrom(
      PBHelper.vintPrefixed(in));
  RemoteBlockReader2.checkSuccess(status, peer, block, file);
  ReadOpChecksumInfoProto checksumInfo =
    status.getReadOpChecksumInfo();
  DataChecksum checksum = DataTransferProtoUtil.fromProto(
      checksumInfo.getChecksum());
  //Warning when we get CHECKSUM_NULL?
  
  // Read the first chunk offset.
  long firstChunkOffset = checksumInfo.getChunkOffset();
  
  if ( firstChunkOffset < 0 || firstChunkOffset > startOffset ||
      firstChunkOffset <= (startOffset - checksum.getBytesPerChecksum())) {
    throw new IOException("BlockReader: error in first chunk offset (" +
                          firstChunkOffset + ") startOffset is " + 
                          startOffset + " for file " + file);
  }

  return new RemoteBlockReader(file, block.getBlockPoolId(), block.getBlockId(),
      in, checksum, verifyChecksum, startOffset, firstChunkOffset, len,
      peer, datanodeID, peerCache);
}

开发者ID:Nextzero，项目名称:hadoop-2.6.0-cdh5.4.3，代码行数:62，代码来源:RemoteBlockReader.java

示例9: newBlockReader

import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto; //导入依赖的package包/类
/**
 * Create a new BlockReader specifically to satisfy a read.
 * This method also sends the OP_READ_BLOCK request.
 *
 * @param sock  An established Socket to the DN. The BlockReader will not close it normally.
 *             This socket must have an associated Channel.
 * @param file  File location
 * @param block  The block object
 * @param blockToken  The block token for security
 * @param startOffset  The read offset, relative to block head
 * @param len  The number of bytes to read
 * @param verifyChecksum  Whether to verify checksum
 * @param clientName  Client name
 * @param peer  The Peer to use
 * @param datanodeID  The DatanodeID this peer is connected to
 * @return New BlockReader instance, or null on error.
 */
public static BlockReader newBlockReader(String file,
                                   ExtendedBlock block,
                                   Token<BlockTokenIdentifier> blockToken,
                                   long startOffset, long len,
                                   boolean verifyChecksum,
                                   String clientName,
                                   Peer peer, DatanodeID datanodeID,
                                   PeerCache peerCache,
                                   CachingStrategy cachingStrategy) throws IOException {
  // in and out will be closed when sock is closed (by the caller)
  final DataOutputStream out = new DataOutputStream(new BufferedOutputStream(
        peer.getOutputStream()));
  new Sender(out).readBlock(block, blockToken, clientName, startOffset, len,
      verifyChecksum, cachingStrategy);

  //
  // Get bytes in block
  //
  DataInputStream in = new DataInputStream(peer.getInputStream());

  BlockOpResponseProto status = BlockOpResponseProto.parseFrom(
      PBHelper.vintPrefixed(in));
  checkSuccess(status, peer, block, file);
  ReadOpChecksumInfoProto checksumInfo =
    status.getReadOpChecksumInfo();
  DataChecksum checksum = DataTransferProtoUtil.fromProto(
      checksumInfo.getChecksum());
  //Warning when we get CHECKSUM_NULL?

  // Read the first chunk offset.
  long firstChunkOffset = checksumInfo.getChunkOffset();

  if ( firstChunkOffset < 0 || firstChunkOffset > startOffset ||
      firstChunkOffset <= (startOffset - checksum.getBytesPerChecksum())) {
    throw new IOException("BlockReader: error in first chunk offset (" +
                          firstChunkOffset + ") startOffset is " +
                          startOffset + " for file " + file);
  }

  return new RemoteBlockReader2(file, block.getBlockPoolId(), block.getBlockId(),
      checksum, verifyChecksum, startOffset, firstChunkOffset, len, peer,
      datanodeID, peerCache);
}

开发者ID:Nextzero，项目名称:hadoop-2.6.0-cdh5.4.3，代码行数:61，代码来源:RemoteBlockReader2.java

示例10: newBlockReader

import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto; //导入依赖的package包/类
/**
 * Create a new BlockReader specifically to satisfy a read.
 * This method also sends the OP_READ_BLOCK request.
 *
 * @param sock  An established Socket to the DN. The BlockReader will not close it normally
 * @param file  File location
 * @param block  The block object
 * @param blockToken  The block token for security
 * @param startOffset  The read offset, relative to block head
 * @param len  The number of bytes to read
 * @param bufferSize  The IO buffer size (not the client buffer size)
 * @param verifyChecksum  Whether to verify checksum
 * @param clientName  Client name
 * @return New BlockReader instance, or null on error.
 */
public static RemoteBlockReader newBlockReader(String file,
                                   ExtendedBlock block, 
                                   Token<BlockTokenIdentifier> blockToken,
                                   long startOffset, long len,
                                   int bufferSize, boolean verifyChecksum,
                                   String clientName, Peer peer,
                                   DatanodeID datanodeID,
                                   PeerCache peerCache)
                                   throws IOException {
  // in and out will be closed when sock is closed (by the caller)
  final DataOutputStream out =
      new DataOutputStream(new BufferedOutputStream(peer.getOutputStream()));
  new Sender(out).readBlock(block, blockToken, clientName, startOffset, len,
      verifyChecksum);
  
  //
  // Get bytes in block, set streams
  //

  DataInputStream in = new DataInputStream(
      new BufferedInputStream(peer.getInputStream(), bufferSize));
  
  BlockOpResponseProto status = BlockOpResponseProto.parseFrom(
      PBHelper.vintPrefixed(in));
  RemoteBlockReader2.checkSuccess(status, peer, block, file);
  ReadOpChecksumInfoProto checksumInfo =
    status.getReadOpChecksumInfo();
  DataChecksum checksum = DataTransferProtoUtil.fromProto(
      checksumInfo.getChecksum());
  //Warning when we get CHECKSUM_NULL?
  
  // Read the first chunk offset.
  long firstChunkOffset = checksumInfo.getChunkOffset();
  
  if ( firstChunkOffset < 0 || firstChunkOffset > startOffset ||
      firstChunkOffset <= (startOffset - checksum.getBytesPerChecksum())) {
    throw new IOException("BlockReader: error in first chunk offset (" +
                          firstChunkOffset + ") startOffset is " + 
                          startOffset + " for file " + file);
  }

  return new RemoteBlockReader(file, block.getBlockPoolId(), block.getBlockId(),
      in, checksum, verifyChecksum, startOffset, firstChunkOffset, len,
      peer, datanodeID, peerCache);
}

开发者ID:ict-carch，项目名称:hadoop-plus，代码行数:61，代码来源:RemoteBlockReader.java

示例11: newBlockReader

import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto; //导入依赖的package包/类
/**
 * Create a new BlockReader specifically to satisfy a read.
 * This method also sends the OP_READ_BLOCK request.
 *
 * @param sock  An established Socket to the DN. The BlockReader will not close it normally.
 *             This socket must have an associated Channel.
 * @param file  File location
 * @param block  The block object
 * @param blockToken  The block token for security
 * @param startOffset  The read offset, relative to block head
 * @param len  The number of bytes to read
 * @param verifyChecksum  Whether to verify checksum
 * @param clientName  Client name
 * @param peer  The Peer to use
 * @param datanodeID  The DatanodeID this peer is connected to
 * @return New BlockReader instance, or null on error.
 */
public static BlockReader newBlockReader(String file,
                                   ExtendedBlock block,
                                   Token<BlockTokenIdentifier> blockToken,
                                   long startOffset, long len,
                                   boolean verifyChecksum,
                                   String clientName,
                                   Peer peer, DatanodeID datanodeID,
                                   PeerCache peerCache) throws IOException {
  // in and out will be closed when sock is closed (by the caller)
  final DataOutputStream out = new DataOutputStream(new BufferedOutputStream(
        peer.getOutputStream()));
  new Sender(out).readBlock(block, blockToken, clientName, startOffset, len,
      verifyChecksum);

  //
  // Get bytes in block
  //
  DataInputStream in = new DataInputStream(peer.getInputStream());

  BlockOpResponseProto status = BlockOpResponseProto.parseFrom(
      PBHelper.vintPrefixed(in));
  checkSuccess(status, peer, block, file);
  ReadOpChecksumInfoProto checksumInfo =
    status.getReadOpChecksumInfo();
  DataChecksum checksum = DataTransferProtoUtil.fromProto(
      checksumInfo.getChecksum());
  //Warning when we get CHECKSUM_NULL?

  // Read the first chunk offset.
  long firstChunkOffset = checksumInfo.getChunkOffset();

  if ( firstChunkOffset < 0 || firstChunkOffset > startOffset ||
      firstChunkOffset <= (startOffset - checksum.getBytesPerChecksum())) {
    throw new IOException("BlockReader: error in first chunk offset (" +
                          firstChunkOffset + ") startOffset is " +
                          startOffset + " for file " + file);
  }

  return new RemoteBlockReader2(file, block.getBlockPoolId(), block.getBlockId(),
      checksum, verifyChecksum, startOffset, firstChunkOffset, len, peer,
      datanodeID, peerCache);
}

开发者ID:ict-carch，项目名称:hadoop-plus，代码行数:60，代码来源:RemoteBlockReader2.java

注：本文中的org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto类示例整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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Java ReadOpChecksumInfoProto类代码示例

示例1: writeSuccessWithChecksumInfo

示例2: newBlockReader

示例3: writeSuccessWithChecksumInfo

示例4: newBlockReader

示例5: newBlockReader

示例6: newBlockReader

示例7: newBlockReader

示例8: newBlockReader

示例9: newBlockReader

示例10: newBlockReader

示例11: newBlockReader

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