📄 dfshealth.jsp
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<%@ page contentType="text/html; charset=UTF-8" import="javax.servlet.*" import="javax.servlet.http.*" import="java.io.*" import="java.util.*" import="org.apache.hadoop.dfs.*" import="org.apache.hadoop.util.*" import="java.text.DateFormat"%><%! FSNamesystem fsn = FSNamesystem.getFSNamesystem(); String namenodeLabel = fsn.getDFSNameNodeMachine() + ":" + fsn.getDFSNameNodePort(); long currentTime; JspHelper jspHelper = new JspHelper(); public void generateLiveNodeData(JspWriter out, DatanodeInfo d) throws IOException { long c = d.getCapacity(); long r = d.getRemaining(); long u = c - r; String cGb = DFSShell.limitDecimal((1.0 * c)/(1024*1024*1024), 2); String uGb = DFSShell.limitDecimal((1.0 * u)/(1024*1024*1024), 2); String percentUsed; if (c > 0) percentUsed = DFSShell.limitDecimal(((1.0 * u)/c)*100, 2); else percentUsed = "100"; out.print("<td style=\"vertical-align: top;\"> <b>" + d.getName() + "</b> <br><i><b>LastContact:</b> " + (currentTime - d.getLastUpdate())/1000 + " second(s) back; "); out.print("<b>Total raw bytes:</b> " + c + "(" + cGb + " GB); "); out.print("<b>Percent used:</b> " + percentUsed); out.print("</i></td>"); } public void generateDFSHealthReport(JspWriter out) throws IOException { Vector live = new Vector(); Vector dead = new Vector(); jspHelper.DFSNodesStatus(live, dead); if (live.isEmpty() && dead.isEmpty()) { out.print("There are no datanodes in the cluster"); } else { out.print("<br><b>Number of live data stores: " + live.size() + ", dead datanodes: " + dead.size() + "</b></br>"); out.print("<table style=\"width: 100%; text-align: left;\" border=\"1\""+ " cellpadding=\"2\" cellspacing=\"2\">"); out.print("<tbody>"); out.print("<tr>"); out.print("<td style=\"vertical-align: top;\"><B>Live Data Stores</B><br></td>"); out.print("<td style=\"vertical-align: top;\"><B>Dead Data Stores</B><br></td>"); out.print("</tr>"); int i = 0; int min = (live.size() > dead.size()) ? dead.size() : live.size(); int max = (live.size() > dead.size()) ? live.size() : dead.size(); currentTime = System.currentTimeMillis(); for (i = 0; i < min; i++) { DatanodeInfo l = (DatanodeInfo)live.elementAt(i); DatanodeInfo d = (DatanodeInfo)dead.elementAt(i); out.print("<tr>"); generateLiveNodeData(out, l); out.print("<td style=\"vertical-align: top;\">" + d.getName() + "<br></td>"); out.print("</tr>"); } int type = (live.size() > dead.size()) ? 1 : 0; for (i = min; i < max; i++) { out.print("<tr>"); if (type == 1) { DatanodeInfo l = (DatanodeInfo)live.elementAt(i); generateLiveNodeData(out, l); out.print("<td style=\"vertical-align: top;\"><br></td>"); } else if (type == 0) { DatanodeInfo d = (DatanodeInfo)dead.elementAt(i); out.print("<td style=\"vertical-align: top;\"><br></td>"); out.print("<td style=\"vertical-align: top;\">" + d.getName() + "<br></td>"); } out.print("</tr>"); } out.print("</tbody></table>"); } } public String totalCapacity() { return fsn.totalCapacity() + "(" + DFSShell.limitDecimal((1.0 * fsn.totalCapacity())/(1024*1024*1024), 2) + " GB)"; } public String totalRemaining() { return fsn.totalRemaining() + "(" + DFSShell.limitDecimal(fsn.totalRemaining()/(1024*1024*1024), 2) + " GB)"; }%><html><title>Hadoop NameNode <%=namenodeLabel%></title><body><h1>NameNode '<%=namenodeLabel%>'</h1><b>Started:</b> <%= fsn.getStartTime()%><br><b>Version:</b> <%= VersionInfo.getVersion()%>, r<%= VersionInfo.getRevision()%><br><b>Compiled:</b> <%= VersionInfo.getDate()%> by <%= VersionInfo.getUser()%><br><b><a href="/nn_browsedfscontent.jsp">Browse the filesystem</a></b><hr><h2>Cluster Summary</h2><b> <%= jspHelper.getSafeModeText()%> </b><p>The capacity of this cluster is <%= totalCapacity()%> and remaining is <%= totalRemaining()%>.<br><% generateDFSHealthReport(out); %><hr><h2>Local logs</h2><a href="/logs/">Log</a> directory<hr><a href="http://lucene.apache.org/hadoop">Hadoop</a>, 2006.<br></body></html>⌨️ 快捷键说明
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