连接到hadoop中的HDFS时出现EOFException

Question

在包含的测试程序中,我尝试将文件从本地磁盘复制到HDFS.代码如下:

package foo.foo1.foo2.test;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

public class TestTestTest {

    public static void main(String[] args) {

    String srcLocation = "foo";
    String destination = "hdfs:///tmp/";

    FileSystem hdfs = null;

    Configuration configuration = new Configuration();
    configuration.set("fs.default.name", "hdfs://namenode:54310/");

    try {
        hdfs = FileSystem.get(configuration);
    } catch (IOException e2) {
        e2.printStackTrace();
        return;
    }

    Path srcpath = new Path(srcLocation);
    Path dstpath = new Path(destination);

    try {
        hdfs.copyFromLocalFile(srcpath, dstpath);
    } catch (IOException e) {
        e.printStackTrace();
    }

    }

}

这失败,出现以下异常:

java.io.IOException: Call to namenode/10.1.1.1:54310 failed on local exception:     java.io.EOFException
    at org.apache.hadoop.ipc.Client.wrapException(Client.java:775)
    at org.apache.hadoop.ipc.Client.call(Client.java:743)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220)
    at $Proxy0.getProtocolVersion(Unknown Source)
    at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:359)
    at org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:106)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:207)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:170)
    at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:82)
    at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1378)
    at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:66)
    at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1390)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:196)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:95)
    at foo.foo1.foo2.test.TestTestTest.main(TestTestTest.java:22)
Caused by: java.io.EOFException
    at java.io.DataInputStream.readInt(DataInputStream.java:375)
    at org.apache.hadoop.ipc.Client$Connection.receiveResponse(Client.java:501)
    at org.apache.hadoop.ipc.Client$Connection.run(Client.java:446)

我的问题看似简单:造成这种情况的原因是什么,我该如何使这个程序工作？从我能够找到的小信息中,我发现连接到HDFS时出现问题,这与配置中的fs.default.name属性有关.以下是我的core-site.xml文件的相关部分:

<configuration>
  <property>
    <name>fs.default.name</name>
    <value>hdfs://namenode:54310</value>
  </property>

</configuration>

也许特别感兴趣的是,如果我将我的类路径中的所有jar都捆绑到一个mega-jar中,并通过hadoop命令运行该程序,它就可以正常工作.那么我做错了什么？

Answer 1

确保您针对在群集上运行的相同Hadoop版本进行编译.