<%@ page
contentType="text/html; charset=UTF-8"
import="java.io.*"
import="java.security.PrivilegedExceptionAction"
import="java.util.*"
import="javax.servlet.*"
import="javax.servlet.http.*"
import="org.apache.hadoop.conf.Configuration"
import="org.apache.hadoop.hdfs.*"
import="org.apache.hadoop.hdfs.server.namenode.*"
import="org.apache.hadoop.hdfs.server.datanode.*"
import="org.apache.hadoop.hdfs.protocol.*"
import="org.apache.hadoop.hdfs.security.token.delegation.*"
import="org.apache.hadoop.io.Text"
import="org.apache.hadoop.security.UserGroupInformation"
import="org.apache.hadoop.security.token.Token"
import="org.apache.hadoop.util.*"
import="java.text.DateFormat"
import="java.net.InetAddress"
import="java.net.URLEncoder"
%>
<%!
static String getDelegationToken(final NameNode nn,
final UserGroupInformation ugi,
HttpServletRequest request, Configuration conf)
throws IOException, InterruptedException {
Token token =
ugi.doAs(
new PrivilegedExceptionAction>()
{
public Token run() throws IOException {
return nn.getDelegationToken(new Text(ugi.getUserName()));
}
});
return token.encodeToUrlString();
}
public void redirectToRandomDataNode(
ServletContext context,
HttpServletRequest request,
HttpServletResponse resp
) throws IOException, InterruptedException {
Configuration conf = (Configuration) context.getAttribute(JspHelper.CURRENT_CONF);
NameNode nn = (NameNode)context.getAttribute("name.node");
final UserGroupInformation ugi = JspHelper.getUGI(context, request, conf);
String tokenString = null;
if (UserGroupInformation.isSecurityEnabled()) {
tokenString = getDelegationToken(nn, ugi, request, conf);
}
FSNamesystem fsn = nn.getNamesystem();
String datanode = fsn.randomDataNode();
String redirectLocation;
String nodeToRedirect;
int redirectPort;
if (datanode != null) {
redirectPort = Integer.parseInt(datanode.substring(datanode.indexOf(':')
+ 1));
nodeToRedirect = datanode.substring(0, datanode.indexOf(':'));
}
else {
nodeToRedirect = nn.getHttpAddress().getHostName();
redirectPort = nn.getHttpAddress().getPort();
}
String fqdn = InetAddress.getByName(nodeToRedirect).getCanonicalHostName();
redirectLocation = "http://" + fqdn + ":" + redirectPort +
"/browseDirectory.jsp?namenodeInfoPort=" +
nn.getHttpAddress().getPort() +
"&dir=/" +
(tokenString == null ? "" :
JspHelper.getDelegationTokenUrlParam(tokenString));
resp.sendRedirect(redirectLocation);
}
%>
<%
redirectToRandomDataNode(application, request, response);
%>
Local logs
Log directory
<%
out.println(ServletUtil.htmlFooter());
%>