Hadoop状态页面的Browse the filesystem链接无效的问题NameNode '192.168.1.164:9000'

Started:

Tue Jul 06 14:37:10 CST 2010

Version:

0.20.2, r911707

Compiled:

Fri Feb 19 08:07:34 UTC 2010 by chrisdo

Upgrades:

There are no upgrades in progress.

Browse the filesystem

Namenode Logs

4 files and directories, 1 blocks = 5 total. Heap Size is 16.12 MB / 888.94 MB (1%)

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Configured Capacity

:

1.59 TB

DFS Used

72 KB

Non DFS Used

120.87 GB

DFS Remaining

1.47 TB

DFS Used%

0 %

DFS Remaining%

92.57 %

Live Nodes

2

Dead Nodes

Storage Directory

Type

State

/opt/hadoop/data/dfs.name.dir

IMAGE_AND_EDITS

Active

Hadoop

, 2010.

　　以上是我们安装完成，并且正常运行后的HDFS状态页面（访问地址：http://210.66.44.88:50070/dfshealth.jsp），其中的Browse the filesystem

是查看文件系统的入口，但是有可能会出现无法访问的问题，我就遇到过，上网查了很久的解决办法都无果，后来我通过firebug拦截请求发现，Browse the filesystem这个链接的页面会跳转到另外一个页面，而这个页面的地址是<code>http://192.168.1.164:50075/browseDirectory.jsp?namenodeInfoPort=50070&amp;dir=%2F（</code>

　　我们来看看nn_browsedfscontent.jsp的源代码：

package org.apache.hadoop.hdfs.server.namenode;   

import java.io.IOException;   

import java.net.InetAddress;   

import java.net.InetSocketAddress;   

import java.net.URLEncoder;   

import java.util.Vector;   

import javax.servlet.ServletConfig;   

import javax.servlet.ServletContext;   

import javax.servlet.ServletException;   

import javax.servlet.http.HttpServletRequest;   

import javax.servlet.http.HttpServletResponse;   

import javax.servlet.http.HttpSession;   

import javax.servlet.jsp.JspFactory;   

import javax.servlet.jsp.JspWriter;   

import javax.servlet.jsp.PageContext;   

import javax.servlet.jsp.SkipPageException;   

import org.apache.hadoop.util.ServletUtil;   

import org.apache.jasper.runtime.HttpJspBase;   

import org.apache.jasper.runtime.JspSourceDependent;   

import org.apache.jasper.runtime.ResourceInjector;   

public final class nn_005fbrowsedfscontent_jsp extends HttpJspBase

  implements JspSourceDependent   

{   

  private static final JspFactory _jspxFactory = JspFactory.getDefaultFactory();

  private static Vector _jspx_dependants;   

  private ResourceInjector _jspx_resourceInjector;   

  //此处是将请求随机转发到一个DataNode节点上

  public void redirectToRandomDataNode(NameNode nn, HttpServletResponse resp)

    throws IOException   

  {   

    String nodeToRedirect;   

    int redirectPort;   

    FSNamesystem fsn = nn.getNamesystem();   

    String datanode = fsn.randomDataNode();   

    if (datanode != null) {   

      redirectPort = Integer.parseInt(datanode.substring(datanode.indexOf(58) + 1));   

      nodeToRedirect = datanode.substring(0, datanode.indexOf(58));   

    }   

    else {   

      nodeToRedirect = nn.getHttpAddress().getHostName();   

      redirectPort = nn.getHttpAddress().getPort();   

    // 此处是得到服务器的名称（hostname）

    String fqdn = InetAddress.getByName(nodeToRedirect).getCanonicalHostName();   

    String redirectLocation = "http://" + fqdn + ":" + redirectPort + "/browseDirectory.jsp?namenodeInfoPort=" + nn.getHttpAddress().getPort() + "&amp;dir=" + URLEncoder.encode("/", "UTF-8");

    resp.sendRedirect(redirectLocation);   

  }   

  public Object getDependants()   

    return _jspx_dependants;   

  public void _jspService(HttpServletRequest request, HttpServletResponse response)

    throws IOException, ServletException   

    PageContext pageContext = null;   

    HttpSession session = null;   

    ServletContext application = null;   

    ServletConfig config = null;   

    JspWriter out = null;   

    Object page = this;   

    JspWriter _jspx_out = null;   

    PageContext _jspx_page_context = null;   

    try  

    {   

      response.setContentType("text/html; charset=UTF-8");   

      pageContext = _jspxFactory.getPageContext(this, request, response, null, true, 8192, true);

      _jspx_page_context = pageContext;   

      application = pageContext.getServletContext();   

      config = pageContext.getServletConfig();   

      session = pageContext.getSession();   

      out = pageContext.getOut();   

      _jspx_out = out;   

      this._jspx_resourceInjector = ((ResourceInjector)application.getAttribute("com.sun.appserv.jsp.resource.injector"));

      out.write(10);   

      out.write("\n\n&lt;html&gt;\n\n&lt;title&gt;&lt;/title&gt;\n\n&lt;body&gt;\n");   

      NameNode nn = (NameNode)application.getAttribute("name.node");   

      redirectToRandomDataNode(nn, response);   

      out.write("\n&lt;hr&gt;\n\n&lt;h2&gt;Local logs&lt;/h2&gt;\n&lt;a href=\"/logs/\"&gt;Log&lt;/a&gt; directory\n\n");   

      out.println(ServletUtil.htmlFooter());   

    } catch (Throwable t) {   

      if (!(t instanceof SkipPageException)) {   

        out = _jspx_out;   

        if ((out != null) &amp;&amp; (out.getBufferSize() != 0))

          out.clearBuffer();   

        if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);

      }   

    } finally {   

      _jspxFactory.releasePageContext(_jspx_page_context);   

}  

　　从代码可以看出，当我们点击Browse the filesystem