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20 package org.apache.hadoop.hbase.regionserver;
21
22 import java.io.IOException;
23 import java.io.OutputStream;
24 import java.io.PrintWriter;
25 import java.util.Date;
26
27 import javax.servlet.http.HttpServletRequest;
28 import javax.servlet.http.HttpServletResponse;
29
30 import org.apache.hadoop.conf.Configuration;
31 import org.apache.hadoop.hbase.monitoring.LogMonitoring;
32 import org.apache.hadoop.hbase.monitoring.StateDumpServlet;
33 import org.apache.hadoop.hbase.monitoring.TaskMonitor;
34 import org.apache.hadoop.util.ReflectionUtils;
35
36 public class RSDumpServlet extends StateDumpServlet {
37 private static final long serialVersionUID = 1L;
38 private static final String LINE =
39 "===========================================================";
40
41 @Override
42 public void doGet(HttpServletRequest request, HttpServletResponse response)
43 throws IOException {
44 HRegionServer hrs = (HRegionServer)getServletContext().getAttribute(
45 HRegionServer.REGIONSERVER);
46 assert hrs != null : "No RS in context!";
47
48 response.setContentType("text/plain");
49 OutputStream os = response.getOutputStream();
50 PrintWriter out = new PrintWriter(os);
51
52 out.println("Master status for " + hrs.getServerName()
53 + " as of " + new Date());
54
55 out.println("\n\nVersion Info:");
56 out.println(LINE);
57 dumpVersionInfo(out);
58
59 out.println("\n\nTasks:");
60 out.println(LINE);
61 TaskMonitor.get().dumpAsText(out);
62
63 out.println("\n\nExecutors:");
64 out.println(LINE);
65 dumpExecutors(hrs.getExecutorService(), out);
66
67 out.println("\n\nStacks:");
68 out.println(LINE);
69 ReflectionUtils.printThreadInfo(out, "");
70
71 out.println("\n\nRS Configuration:");
72 out.println(LINE);
73 Configuration conf = hrs.getConfiguration();
74 out.flush();
75 conf.writeXml(os);
76 os.flush();
77
78 out.println("\n\nLogs");
79 out.println(LINE);
80 long tailKb = getTailKbParam(request);
81 LogMonitoring.dumpTailOfLogs(out, tailKb);
82
83 out.flush();
84 }
85 }