hadoop-common-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From ztesoft <njche...@hotmail.com>
Subject Exception occurs when I try to read a file
Date Tue, 19 Jan 2010 05:48:20 GMT

Hi, I wrote a program to read a file in HDFS.
The codes are following:
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URI;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;

public class FileSystemCat {
    public static void main(String[] args) throws IOException {
        String uri = "hdfs://10.45.11.247:9000/user/root/test3.xml";
        Configuration conf = new Configuration();
        FileSystem fs = FileSystem.get(URI.create(uri),conf);
        FSDataInputStream in = null;
        try {
            in = fs.open(new Path(uri));
            IOUtils.copyBytes(in, System.out, 4096,false);
            in.seek(10);
            IOUtils.copyBytes(in, System.out, 4096,false);
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally
        {
            IOUtils.closeStream(in);
        }
    }
}

The error occurs like following:
Exception in thread "main" java.io.IOException: Call to /10.45.11.247:9000
failed on local exception: java.io.EOFException
        at org.apache.hadoop.ipc.Client.wrapException(Client.java:774)
        at org.apache.hadoop.ipc.Client.call(Client.java:742)
        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:105)
        at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:177)
        at
org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:82)
        at
org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1373)
        at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:66)
        at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1385)
        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:191)
        at hadoopstudy.FileSystemCat.main(FileSystemCat.java:26)
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)
Java Result: 1

Does anyone know how to solve it?


-- 
View this message in context: http://old.nabble.com/Exception-occurs-when-I-try-to-read-a-file-tp27221237p27221237.html
Sent from the Hadoop core-user mailing list archive at Nabble.com.


Mime
View raw message