Bad connect ack with firstBadLink 192.168.1.14:50010-优快云博客

本文详细解析了在使用Hadoop put命令过程中遇到的Bad connect ack错误，通过关闭防火墙和禁用SELinux的方式成功解决问题，并提供了错误排查思路。

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Exception in thread "main" java.io.IOException: Bad connect ack with firstBadLink 192.168.1.14:50010
at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.createBlockOutputStream(DFSClient.java:2903)
at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2826)
at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2102)
at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2288)

运行hadoop put文件的时候回报这个错误

这个在 DFSClient 里

  // connects to the first datanode in the pipeline
    // Returns true if success, otherwise return failure.
    //
    private boolean createBlockOutputStream(DatanodeInfo[] nodes, String client,
                    boolean recoveryFlag) {
      String firstBadLink = "";
      if (LOG.isDebugEnabled()) {
        for (int i = 0; i < nodes.length; i++) {
          LOG.debug("pipeline = " + nodes[i].getName());
        }
      }

      // persist blocks on namenode on next flush
      persistBlocks = true;

      try {
        LOG.debug("Connecting to " + nodes[0].getName());
        InetSocketAddress target = NetUtils.createSocketAddr(nodes[0].getName());
        s = socketFactory.createSocket();
        int timeoutValue = 3000 * nodes.length + socketTimeout;
        NetUtils.connect(s, target, timeoutValue);
        s.setSoTimeout(timeoutValue);
        s.setSendBufferSize(DEFAULT_DATA_SOCKET_SIZE);
        LOG.debug("Send buf size " + s.getSendBufferSize());
        long writeTimeout = HdfsConstants.WRITE_TIMEOUT_EXTENSION * nodes.length +
                            datanodeWriteTimeout;

        //
        // Xmit header info to datanode
        //
        DataOutputStream out = new DataOutputStream(
            new BufferedOutputStream(NetUtils.getOutputStream(s, writeTimeout), 
                                     DataNode.SMALL_BUFFER_SIZE));
        blockReplyStream = new DataInputStream(NetUtils.getInputStream(s));

        out.writeShort( DataTransferProtocol.DATA_TRANSFER_VERSION );
        out.write( DataTransferProtocol.OP_WRITE_BLOCK );
        out.writeLong( block.getBlockId() );
        out.writeLong( block.getGenerationStamp() );
        out.writeInt( nodes.length );
        out.writeBoolean( recoveryFlag );       // recovery flag
        Text.writeString( out, client );
        out.writeBoolean(false); // Not sending src node information
        out.writeInt( nodes.length - 1 );
        for (int i = 1; i < nodes.length; i++) {
          nodes[i].write(out);
        }
        checksum.writeHeader( out );
        out.flush();

        // receive ack for connect
        firstBadLink = Text.readString(blockReplyStream);
        if (firstBadLink.length() != 0) {
          throw new IOException("Bad connect ack with firstBadLink " + firstBadLink);
        }

        blockStream = out;
        return true;     // success

      } catch (IOException ie) {

显示为没有收到正确的应答包,我用了两种方式解决了

1) '/etc/init.d/iptables stop' -->stopped firewall
2) SELINUX=disabled in '/etc/selinux/config' file.-->disabled selinux

一般的这种hadoop 应答类错误多半是防火墙没有关闭