org.apache.hadoop.dfs
Class FileDataServlet

java.lang.Object
  extended by javax.servlet.GenericServlet
      extended by javax.servlet.http.HttpServlet
          extended by org.apache.hadoop.dfs.FileDataServlet
All Implemented Interfaces:
Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public class FileDataServlet
extends javax.servlet.http.HttpServlet

Redirect queries about the hosted filesystem to an appropriate datanode.

See Also:
HftpFileSystem, Serialized Form

Constructor Summary
FileDataServlet()
           
 
Method Summary
 void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
          Service a GET request as described below.
protected static DatanodeInfo pickSrcDatanode(org.apache.hadoop.dfs.DFSFileInfo i, NameNode nn)
          Select a datanode to service this request.
 
Methods inherited from class javax.servlet.http.HttpServlet
doDelete, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service, service
 
Methods inherited from class javax.servlet.GenericServlet
destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, init, log, log
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

FileDataServlet

public FileDataServlet()
Method Detail

pickSrcDatanode

protected static DatanodeInfo pickSrcDatanode(org.apache.hadoop.dfs.DFSFileInfo i,
                                              NameNode nn)
                                       throws IOException
Select a datanode to service this request. Currently, this looks at no more than the first five blocks of a file, selecting a datanode randomly from the most represented.

Throws:
IOException

doGet

public void doGet(javax.servlet.http.HttpServletRequest request,
                  javax.servlet.http.HttpServletResponse response)
           throws javax.servlet.ServletException,
                  IOException
Service a GET request as described below. Request: GET http://<nn>:<port>/data[/<path>] HTTP/1.1

Overrides:
doGet in class javax.servlet.http.HttpServlet
Throws:
javax.servlet.ServletException
IOException


Copyright © 2006 The Apache Software Foundation