org.apache.hadoop.dfs
Class FileDataServlet

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          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

protected org.apache.hadoop.dfs.ClientProtocol	createNameNodeProxy(UnixUserGroupInformation ugi) Create a NameNode proxy from the current ServletContext.
void	doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Service a GET request as described below.
protected UnixUserGroupInformation	getUGI(javax.servlet.http.HttpServletRequest request) Get UserGroupInformation from 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

doGet

public void doGet(javax.servlet.http.HttpServletRequest request,
                  javax.servlet.http.HttpServletResponse response)
           throws 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:

IOException

getUGI

protected UnixUserGroupInformation getUGI(javax.servlet.http.HttpServletRequest request)

Get UserGroupInformation from request

createNameNodeProxy

protected org.apache.hadoop.dfs.ClientProtocol createNameNodeProxy(UnixUserGroupInformation ugi)
                                                            throws IOException

Create a NameNode proxy from the current ServletContext.

Throws:

IOException