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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
Cluster Summary
4 files and directories, 1 blocks = 5 total. Heap Size is 16.12 MB / 888.94 MB (1%)
| 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 | : | 0 |
NameNode Storage:
Storage Directory |
Type |
State | | /opt/hadoop/data/dfs.name.dir | IMAGE_AND_EDITS | Active |
Hadoop , 2010.
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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http://192.168.1.164:50075/browseDirectory.jsp?namenodeInfoPort=50070&dir=%2F（ 192.168.1.164是服务器的内网地址，在masters和slaves文件中配置的是局域网IP），但是需要通过外网才能访问（类似于http://210.66.44.88:50075/browseDirectory.jsp?namenodeInfoPort=50070&dir=%2F才行），这就是问题所在。
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() + "&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<html>\n\n<title></title>\n\n<body>\n");
NameNode nn = (NameNode)application.getAttribute("name.node");
redirectToRandomDataNode(nn, response);
out.write("\n<hr>\n\n<h2>Local logs</h2>\n<a href=\"/logs/\">Log</a> directory\n\n");
out.println(ServletUtil.htmlFooter());
out.write(10);
} catch (Throwable t) {
if (!(t instanceof SkipPageException)) {
out = _jspx_out;
if ((out != null) && (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 时后台会将请求随机转发到一台DataNode节点，使用的是slaves文件中配置的服务器列表所反解的域名或主机名，而通过局域网IP未能反解出域名和主机名，所以用的是IP，这样就出问题了，解决办法有两个：视redirectToRandomDataNode方法内生成的URL而定，如果反转域名是主机名的话，你只需要修改本地HOSTS映射就可以了（推荐使用Windows Hosts Editor，软件地址：http://yymmiinngg.iyunv.com/blog/360779）；如果反转出的域名是主机局域网IP的话，那就需要配置slaves和masters使用域名或外网IP |
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