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From Olivier Smadja <osma...@gmail.com>
Subject Re: Appending to a file / updating a file
Date Thu, 28 May 2009 14:03:32 GMT
Hi Sacha!

Thanks for the quick answer. Is there a simple way to search the mailing
list? by text or by author.

At http://mail-archives.apache.org/mod_mbox/hadoop-core-user/ I only see a
browse per month...

Thanks,
Olivier


On Thu, May 28, 2009 at 10:57 AM, Sasha Dolgy <sdolgy@gmail.com> wrote:

> append isn't supported without modifying the configuration file for
> hadoop.  check out the mailling list threads ... i've sent a post in
> the past explaining how to enable it.
>
> On Thu, May 28, 2009 at 2:46 PM, Olivier Smadja <osmadja@gmail.com> wrote:
> > Hello,
> >
> > I'm trying hadoop for the first time and I'm just trying to create a file
> > and append some text in it with the following code:
> >
> >
> > import java.io.IOException;
> >
> > import org.apache.hadoop.conf. Configuration;
> > import org.apache.hadoop.fs.FSDataOutputStream;
> > import org.apache.hadoop.fs.FileSystem;
> > import org.apache.hadoop.fs.Path;
> >
> > /**
> >  * @author olivier
> >  *
> >  */
> > public class HadoopIO {
> >
> >    public static void main(String[] args) throws IOException {
> >
> >
> >        String directory = "/Users/olivier/tmp/hadoop-data";
> >        Configuration conf = new Configuration(true);
> >        Path path = new Path(directory);
> >        // Create the File system
> >        FileSystem fs = path.getFileSystem(conf);
> >        // Sets the working directory
> >        fs.setWorkingDirectory(path);
> >
> >        System.out.println(fs.getWorkingDirectory());
> >
> >        // Creates a files
> >        FSDataOutputStream out = fs.create(new Path("test.txt"));
> >        out.writeBytes("Testing hadoop - first line");
> >        out.close();
> >        // then try to append something
> >        out = fs.append(new Path("test.txt"));
> >        out.writeBytes("Testing hadoop - second line");
> >        out.close();
> >
> >        fs.close();
> >
> >
> >    }
> >
> > }
> >
> >
> > but I receive the following exception:
> >
> > Exception in thread "main" java.io.IOException: Not supported
> >    at
> >
> org.apache.hadoop.fs.ChecksumFileSystem.append(ChecksumFileSystem.java:290)
> >    at org.apache.hadoop.fs.FileSystem.append(FileSystem.java:525)
> >    at com.neodatis.odb.hadoop.HadoopIO.main(HadoopIO.java:38)
> >
> >
> > 1) Can someone tell me what am i doing wrong?
> >
> > 2) How can I update the file (for example, just update the first 10 bytes
> of
> > the file)?
> >
> >
> > Thanks,
> > Olivier
> >
>
>
>
> --
> Sasha Dolgy
> sasha.dolgy@gmail.com
>

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