Re: HDFS and Servlets

[Cesar Delgado]

Ion,

Thanks!  I'll give it a shot in the next couple of days!

-Cesar

Ion Badita wrote:

Cesar Delgado wrote:

Does anyone have an example of how I can read a file that lives in HDFS from a Servlet?

Thank you for your time,

-Cesar

I would use something like this:

       byte[] buffer = new byte[8192];

       FileSystem hdfs = FileSystem.get(new Configuration());
       Path path = new Path("your/path");
             FSDataInputStream in = hdfs.open(path);
       ServletOutputStream out = servletResponse.getOutputStream();
/

// you could set the content-type and the length of the file, to help the browser

//        servletResponse.setContentType("file/contentType");
//        servletResponse.setContentLength((int)hdfs.getLength(path));/
         int readed;
             while((readed = in.read(buffer)) != -1) {
           out.write(buffer, 0, readed);
       }
             in.close();
       out.flush();
       out.close();


You have to make sure that the HDFS is initialized.
The servletResponse is taken from servlet service or get method.

I hope this will help you!


Ion