java - Hadoop : java. io.IOException : Call to localhost/127. 0.0.1 :54310 failed on local exception: java. io.EOFException

Question

我是 hadoop 的新手，今天才开始使用它，我想将文件写入 hdfs hadoop 服务器，我正在使用服务器 hadoop 1.2.1，当我在 cli 中给出 jps 命令时，我能够看到所有节点都在运行，

31895 Jps
29419 SecondaryNameNode
29745 TaskTracker
29257 DataNode

这是我将文件写入 hdfs 系统的示例客户端代码

public static void main(String[] args) 
   {
        try {
          //1. Get the instance of COnfiguration
          Configuration configuration = new Configuration();
          configuration.addResource(new Path("/data/WorkArea/hadoop/hadoop-1.2.1/hadoop-1.2.1/conf/core-site.xml"));
          configuration.addResource(new Path("/data/WorkArea/hadoop/hadoop-1.2.1/hadoop-1.2.1/conf/hdfs-site.xml"));
          //2. Create an InputStream to read the data from local file
          InputStream inputStream = new BufferedInputStream(new FileInputStream("/home/local/PAYODA/hariprasanth.l/Desktop/ProjectionTest"));
          //3. Get the HDFS instance
          FileSystem hdfs = FileSystem.get(new URI("hdfs://localhost:54310"), configuration);
          //4. Open a OutputStream to write the data, this can be obtained from the FileSytem
          OutputStream outputStream = hdfs.create(new Path("hdfs://localhost:54310/user/hadoop/Hadoop_File.txt"),
          new Progressable() {  
                  @Override
                  public void progress() {
             System.out.println("....");
                  }
                        });
          try
          {
            IOUtils.copyBytes(inputStream, outputStream, 4096, false); 
          }
          finally
          {
            IOUtils.closeStream(inputStream);
            IOUtils.closeStream(outputStream);
          } 
       } catch (Exception e) {
           e.printStackTrace();
       }
   }

运行代码时我的异常，

java.io.IOException: Call to localhost/127.0.0.1:54310 failed on local exception: java.io.EOFException
at org.apache.hadoop.ipc.Client.wrapException(Client.java:1063)
at org.apache.hadoop.ipc.Client.call(Client.java:1031)
at org.apache.hadoop.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:198)
at com.sun.proxy.$Proxy0.getProtocolVersion(Unknown Source)
at org.apache.hadoop.ipc.WritableRpcEngine.getProxy(WritableRpcEngine.java:235)
at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:275)
at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:249)
at org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:163)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:283)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:247)
at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:109)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1792)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:76)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:1826)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1808)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:265)
at com.test.hadoop.writefiles.FileWriter.main(FileWriter.java:27)
Caused by: java.io.EOFException
at java.io.DataInputStream.readInt(DataInputStream.java:392)
at org.apache.hadoop.ipc.Client$Connection.receiveResponse(Client.java:760)
at org.apache.hadoop.ipc.Client$Connection.run(Client.java:698)

当我调试它时，当我尝试连接到 hdfs 本地服务器时，错误发生在行中，

  FileSystem hdfs = FileSystem.get(new URI("hdfs://localhost:54310"), configuration);

据我搜索，它显示版本不匹配，

hadoop 的服务器版本是 - 1.2.1我正在使用的客户端 jar 是

hadoop-common-0.22.0.jar
hadoop-hdfs-0.22.0.jar

请尽快告诉我问题，

如果可能的话，推荐我可以找到 hadoop 客户端 jar 的地方，也给 jar 命名......请......

问候，哈里

Answer 1

这是因为不同 jar 中的相同类表示(即 hadoop commons 和 hadoop core 具有相同的类)。实际上我对使用相应的 jar 感到困惑。

最后，我最终使用了 apache hadoop 核心。它像苍蝇一样工作。