org.apache.hadoop.hdfs.server.namenode

Class FileDataServlet

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

org.apache.hadoop.hdfs.server.namenode.FileDataServlet

All Implemented Interfaces:

Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

@InterfaceAudience.Private
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

Constructors

Constructor and Description
FileDataServlet()

Method Summary

Methods

Modifier and Type	Method and Description
protected ClientProtocol	createNameNodeProxy() 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 UserGroupInformation	getUGI(javax.servlet.http.HttpServletRequest request, Configuration conf)
protected void	writeXml(Exception except, String path, org.znerd.xmlenc.XMLOutputter doc) Write the object to XML format

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

writeXml

protected void writeXml(Exception except,
            String path,
            org.znerd.xmlenc.XMLOutputter doc)
                 throws IOException

Write the object to XML format

Throws:

IOException

createNameNodeProxy

protected ClientProtocol createNameNodeProxy()
                                      throws IOException

Create a NameNode proxy from the current ServletContext.

Throws:

IOException

getUGI

protected UserGroupInformation getUGI(javax.servlet.http.HttpServletRequest request,
                          Configuration conf)
                               throws IOException

Throws:

IOException