/*
   * XXX (ab) Bulk of this method is copied verbatim from {@link DFSClient}, which is
   * bad. Both places should be refactored to provide a method to copy blocks
   * around.
   */
  private void copyBlock(DFSClient dfs, LocatedBlock lblock, OutputStream fos) throws Exception {
    int failures = 0;
    InetSocketAddress targetAddr = null;
    TreeSet<DatanodeInfo> deadNodes = new TreeSet<DatanodeInfo>();
    BlockReader blockReader = null;
    ExtendedBlock block = lblock.getBlock();

    while (blockReader == null) {
      DatanodeInfo chosenNode;

      try {
        chosenNode = bestNode(dfs, lblock.getLocations(), deadNodes);
        targetAddr = NetUtils.createSocketAddr(chosenNode.getXferAddr());
      } catch (IOException ie) {
        if (failures >= DFSConfigKeys.DFS_CLIENT_MAX_BLOCK_ACQUIRE_FAILURES_DEFAULT) {
          throw new IOException("Could not obtain block " + lblock, ie);
        }
        LOG.info("Could not obtain block from any node:  " + ie);
        try {
          Thread.sleep(10000);
        } catch (InterruptedException iex) {
        }
        deadNodes.clear();
        failures++;
        continue;
      }
      try {
        String file =
            BlockReaderFactory.getFileName(targetAddr, block.getBlockPoolId(), block.getBlockId());
        blockReader =
            new BlockReaderFactory(dfs.getConf())
                .setFileName(file)
                .setBlock(block)
                .setBlockToken(lblock.getBlockToken())
                .setStartOffset(0)
                .setLength(-1)
                .setVerifyChecksum(true)
                .setClientName("fsck")
                .setDatanodeInfo(chosenNode)
                .setInetSocketAddress(targetAddr)
                .setCachingStrategy(CachingStrategy.newDropBehind())
                .setClientCacheContext(dfs.getClientContext())
                .setConfiguration(namenode.conf)
                .setRemotePeerFactory(
                    new RemotePeerFactory() {
                      @Override
                      public Peer newConnectedPeer(InetSocketAddress addr) throws IOException {
                        Peer peer = null;
                        Socket s = NetUtils.getDefaultSocketFactory(conf).createSocket();
                        try {
                          s.connect(addr, HdfsServerConstants.READ_TIMEOUT);
                          s.setSoTimeout(HdfsServerConstants.READ_TIMEOUT);
                          peer =
                              TcpPeerServer.peerFromSocketAndKey(
                                  s, namenode.getRpcServer().getDataEncryptionKey());
                        } finally {
                          if (peer == null) {
                            IOUtils.closeQuietly(s);
                          }
                        }
                        return peer;
                      }
                    })
                .build();
      } catch (IOException ex) {
        // Put chosen node into dead list, continue
        LOG.info("Failed to connect to " + targetAddr + ":" + ex);
        deadNodes.add(chosenNode);
      }
    }
    byte[] buf = new byte[1024];
    int cnt = 0;
    boolean success = true;
    long bytesRead = 0;
    try {
      while ((cnt = blockReader.read(buf, 0, buf.length)) > 0) {
        fos.write(buf, 0, cnt);
        bytesRead += cnt;
      }
      if (bytesRead != block.getNumBytes()) {
        throw new IOException(
            "Recorded block size is "
                + block.getNumBytes()
                + ", but datanode returned "
                + bytesRead
                + " bytes");
      }
    } catch (Exception e) {
      LOG.error("Error reading block", e);
      success = false;
    } finally {
      blockReader.close();
    }
    if (!success) {
      throw new Exception("Could not copy block data for " + lblock.getBlock());
    }
  }
示例#2
0
  /*
   * XXX (ab) Bulk of this method is copied verbatim from {@link DFSClient}, which is
   * bad. Both places should be refactored to provide a method to copy blocks
   * around.
   */
  private void copyBlock(DFSClient dfs, LocatedBlock lblock, OutputStream fos) throws Exception {
    int failures = 0;
    InetSocketAddress targetAddr = null;
    TreeSet<DatanodeInfo> deadNodes = new TreeSet<DatanodeInfo>();
    Socket s = null;
    BlockReader blockReader = null;
    Block block = lblock.getBlock();

    while (s == null) {
      DatanodeInfo chosenNode;

      try {
        chosenNode = bestNode(dfs, lblock.getLocations(), deadNodes);
        targetAddr = NetUtils.createSocketAddr(chosenNode.getName());
      } catch (IOException ie) {
        if (failures >= DFSClient.MAX_BLOCK_ACQUIRE_FAILURES) {
          throw new IOException("Could not obtain block " + lblock);
        }
        LOG.info("Could not obtain block from any node:  " + ie);
        try {
          Thread.sleep(10000);
        } catch (InterruptedException iex) {
        }
        deadNodes.clear();
        failures++;
        continue;
      }
      try {
        s = new Socket();
        s.connect(targetAddr, HdfsConstants.READ_TIMEOUT);
        s.setSoTimeout(HdfsConstants.READ_TIMEOUT);

        blockReader =
            BlockReader.newBlockReader(
                DataTransferProtocol.DATA_TRANSFER_VERSION,
                nn.getNamesystem().getFSImage().storage.namespaceID,
                s,
                targetAddr.toString() + ":" + block.getBlockId(),
                block.getBlockId(),
                block.getGenerationStamp(),
                0,
                -1,
                conf.getInt("io.file.buffer.size", 4096));

      } catch (IOException ex) {
        // Put chosen node into dead list, continue
        LOG.info("Failed to connect to " + targetAddr + ":" + ex);
        deadNodes.add(chosenNode);
        if (s != null) {
          try {
            s.close();
          } catch (IOException iex) {
          }
        }
        s = null;
      }
    }
    if (blockReader == null) {
      throw new Exception("Could not open data stream for " + lblock.getBlock());
    }
    byte[] buf = new byte[1024];
    int cnt = 0;
    boolean success = true;
    long bytesRead = 0;
    try {
      while ((cnt = blockReader.read(buf, 0, buf.length)) > 0) {
        fos.write(buf, 0, cnt);
        bytesRead += cnt;
      }
      if (bytesRead != block.getNumBytes()) {
        throw new IOException(
            "Recorded block size is "
                + block.getNumBytes()
                + ", but datanode returned "
                + bytesRead
                + " bytes");
      }
    } catch (Exception e) {
      e.printStackTrace();
      success = false;
    } finally {
      try {
        s.close();
      } catch (Exception e1) {
      }
    }
    if (!success) throw new Exception("Could not copy block data for " + lblock.getBlock());
  }