Hadoop Browse the filesystem 无效处理

当我们安装好并正常运行hdfs后输入http://xxxxxxxxx:50070会进入下图所示的页面。其中Browse the filesystem 是查看文件系统的入口。

但是在发现这个链接一直无效。通过Chrome的开发工具可以看这个链接访问地址是：nn_browsedfscontent.jsp

下面是nn_browsedfscontent.jsp的代码

 1 <%@ page
 2   contentType="text/html; charset=UTF-8"
 3   import="java.io.*"
 4   import="java.security.PrivilegedExceptionAction"
 5   import="java.util.*"
 6   import="javax.servlet.*"
 7   import="javax.servlet.http.*"
 8   import="org.apache.hadoop.conf.Configuration"
 9   import="org.apache.hadoop.hdfs.*"
10   import="org.apache.hadoop.hdfs.server.namenode.*"
11   import="org.apache.hadoop.hdfs.server.datanode.*"
12   import="org.apache.hadoop.hdfs.protocol.*"
13   import="org.apache.hadoop.hdfs.security.token.delegation.*"
14   import="org.apache.hadoop.io.Text"
15   import="org.apache.hadoop.security.UserGroupInformation"
16   import="org.apache.hadoop.security.token.Token"
17   import="org.apache.hadoop.util.*"
18   import="java.text.DateFormat"
19   import="java.net.InetAddress"
20   import="java.net.URLEncoder"
21 %>
22 <%!
23   static String getDelegationToken(final NameNode nn,
24                                    HttpServletRequest request, Configuration conf) 
25                                    throws IOException, InterruptedException {
26     final UserGroupInformation ugi = JspHelper.getUGI(request, conf);
27     Token<DelegationTokenIdentifier> token =
28       ugi.doAs(
29               new PrivilegedExceptionAction<Token<DelegationTokenIdentifier>>()
30           {
31             public Token<DelegationTokenIdentifier> run() throws IOException {
32               return nn.getDelegationToken(new Text(ugi.getUserName()));
33             }
34           });
35     return token.encodeToUrlString();
36   }
37 
38   public void redirectToRandomDataNode(
39                             NameNode nn, 
40                             HttpServletRequest request,
41                             HttpServletResponse resp,
42                             Configuration conf
43                            ) throws IOException, InterruptedException {
44     String tokenString = null;
45     if (UserGroupInformation.isSecurityEnabled()) {
46       tokenString = getDelegationToken(nn, request, conf);
47     }
48     FSNamesystem fsn = nn.getNamesystem();
49     String datanode = fsn.randomDataNode();
50     String redirectLocation;
51     String nodeToRedirect;
52     int redirectPort;
53     if (datanode != null) {
54       redirectPort = Integer.parseInt(datanode.substring(datanode.indexOf(':')
55                      + 1));
56       nodeToRedirect = datanode.substring(0, datanode.indexOf(':'));
57     }
58     else {
59       nodeToRedirect = nn.getHttpAddress().getHostName();
60       redirectPort = nn.getHttpAddress().getPort();
61     }
62     String fqdn = InetAddress.getByName(nodeToRedirect).getCanonicalHostName();
63     redirectLocation = "http://" + fqdn + ":" + redirectPort + 
64                        "/browseDirectory.jsp?namenodeInfoPort=" + 
65                        nn.getHttpAddress().getPort() +
66                        "&dir=/" + 
67                        (tokenString == null ? "" :
68                         JspHelper.getDelegationTokenUrlParam(tokenString));
69     resp.sendRedirect(redirectLocation);
70   }
71 %>
72 
73 <html>
74 
75 <title></title>
76 
77 <body>
78 <% 
79   NameNode nn = (NameNode)application.getAttribute("name.node");
80   Configuration conf = (Configuration) application.getAttribute(JspHelper.CURRENT_CONF);
81   redirectToRandomDataNode(nn, request, response, conf); 
82 %>
83 <hr>
84 
85 <h2>Local logs</h2>
86 <a href="/logs/">Log</a> directory
87 
88 <%
89 out.println(ServletUtil.htmlFooter());
90 %>