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Date: Tue, 7 Feb 2012 17:38:43 +0800
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Subject: Unable to Load Native-Hadoop Library for Your Platform
From: Bing Li <lblabs@gmail.com>
To: common-user@hadoop.apache.org
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Dear all,

I got an error when running a simple Java program on Hadoop. The program is
just to merge some local files to one and put it on Hadoop.

The code is as follows.

                ......

                Configuration conf = new Configuration();
                try
                {
                        FileSystem hdfs = FileSystem.get(conf);
                        FileSystem local = FileSystem.getLocal(conf);
                        Path inputDir = new Path("/home/libing/Temp/");
                        Path hdfsFile = new
Path("/tmp/user/libing/example.txt");

                        try
                        {
                                FileStatus[] inputFiles =
local.listStatus(inputDir);
                                FSDataOutputStream out =
hdfs.create(hdfsFile);
                                for (int i = 0; i < inputFiles.length; i ++)
                                {

System.out.println(inputFiles[i].getPath().getName());
                                        FSDataInputStream in =
local.open(inputFiles[i].getPath());
                                        byte buffer[] = new byte[256];
                                        int bytesRead = 0;
                                        while ((bytesRead =
in.read(buffer)) > 0)
                                        {
                                                out.write(buffer, 0,
bytesRead);
                                        }
                                        in.close();
                                }
                                out.close();
                        }
                        catch (IOException e)
                        {
                                e.printStackTrace();
                        }
                }
                catch (IOException e)
                {
                        e.printStackTrace();
                }

                ......

I run it with ant and got the following warning. BTW, all the relevant jar
packages from Hadoop are specified in the build.xml.

     [java] 2012-2-7 17:16:18 org.apache.hadoop.util.NativeCodeLoader
<clinit>
     [java] Warning: Unable to load native-hadoop library for your
platform... using builtin-java classes where applicable

The program got a correct result. But I cannot figure out what the above
problem is.

Thanks so much!
Bing

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