org.apache.hadoop.hdfs.server.namenode

类 FileDataServlet

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

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

所有已实现的接口:

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.

另请参阅:

HftpFileSystem, 序列化表格

构造器概要

构造器

构造器和说明
FileDataServlet()

方法概要

方法

限定符和类型	方法和说明
protected ClientProtocol	createNameNodeProxy() Create a NameNode proxy from the current ServletContext.
protected URI	createRedirectUri(String servletpath, UserGroupInformation ugi, DatanodeID host, javax.servlet.http.HttpServletRequest request, String tokenString) Create a URI for redirecting request
protected URI	createUri(String parent, HdfsFileStatus i, UserGroupInformation ugi, ClientProtocol nnproxy, javax.servlet.http.HttpServletRequest request, String dt) Create a redirection URI
void	doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Service a GET request as described below.
protected String	getFilename(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Get filename from the request
protected UserGroupInformation	getUGI(javax.servlet.http.HttpServletRequest request, Configuration conf) Get UserGroupInformation from request * @throws IOException
protected void	writeXml(Exception except, String path, org.znerd.xmlenc.XMLOutputter doc) Write the object to XML format

从类继承的方法 javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service, service

从类继承的方法 javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, init, log, log

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

FileDataServlet

public FileDataServlet()

方法详细资料

createUri

protected URI createUri(String parent,
            HdfsFileStatus i,
            UserGroupInformation ugi,
            ClientProtocol nnproxy,
            javax.servlet.http.HttpServletRequest request,
            String dt)
                 throws IOException,
                        URISyntaxException

Create a redirection URI

抛出:

IOException

URISyntaxException

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

覆盖:

doGet 在类中 javax.servlet.http.HttpServlet

抛出:

IOException

writeXml

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

Write the object to XML format

抛出:

IOException

getUGI

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

Get UserGroupInformation from request * @throws IOException

抛出:

IOException

createNameNodeProxy

protected ClientProtocol createNameNodeProxy()
                                      throws IOException

Create a NameNode proxy from the current ServletContext.

抛出:

IOException

createRedirectUri

protected URI createRedirectUri(String servletpath,
                    UserGroupInformation ugi,
                    DatanodeID host,
                    javax.servlet.http.HttpServletRequest request,
                    String tokenString)
                         throws URISyntaxException

Create a URI for redirecting request

抛出:

URISyntaxException

getFilename

protected String getFilename(javax.servlet.http.HttpServletRequest request,
                 javax.servlet.http.HttpServletResponse response)
                      throws IOException

Get filename from the request

抛出:

IOException