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20 package org.apache.hadoop.hbase.master;
21
22 import java.io.IOException;
23 import java.io.OutputStream;
24 import java.io.PrintWriter;
25 import java.util.Date;
26 import java.util.Map;
27 import java.util.NavigableMap;
28
29 import javax.servlet.http.HttpServletRequest;
30 import javax.servlet.http.HttpServletResponse;
31
32 import org.apache.hadoop.conf.Configuration;
33 import org.apache.hadoop.hbase.HServerInfo;
34 import org.apache.hadoop.hbase.HServerLoad;
35 import org.apache.hadoop.hbase.ServerName;
36 import org.apache.hadoop.hbase.master.AssignmentManager.RegionState;
37 import org.apache.hadoop.hbase.monitoring.LogMonitoring;
38 import org.apache.hadoop.hbase.monitoring.StateDumpServlet;
39 import org.apache.hadoop.hbase.monitoring.TaskMonitor;
40 import org.apache.hadoop.util.ReflectionUtils;
41
42 public class MasterDumpServlet extends StateDumpServlet {
43 private static final long serialVersionUID = 1L;
44 private static final String LINE =
45 "===========================================================";
46
47 @Override
48 public void doGet(HttpServletRequest request, HttpServletResponse response)
49 throws IOException {
50 HMaster master = (HMaster) getServletContext().getAttribute(HMaster.MASTER);
51 assert master != null : "No Master in context!";
52
53 response.setContentType("text/plain");
54 OutputStream os = response.getOutputStream();
55 PrintWriter out = new PrintWriter(os);
56
57 out.println("Master status for " + master.getServerName()
58 + " as of " + new Date());
59
60 out.println("\n\nVersion Info:");
61 out.println(LINE);
62 dumpVersionInfo(out);
63
64 out.println("\n\nTasks:");
65 out.println(LINE);
66 TaskMonitor.get().dumpAsText(out);
67
68 out.println("\n\nServers:");
69 out.println(LINE);
70 dumpServers(master, out);
71
72 out.println("\n\nRegions-in-transition:");
73 out.println(LINE);
74 dumpRIT(master, out);
75
76 out.println("\n\nExecutors:");
77 out.println(LINE);
78 dumpExecutors(master.getExecutorService(), out);
79
80 out.println("\n\nStacks:");
81 out.println(LINE);
82 ReflectionUtils.printThreadInfo(out, "");
83
84 out.println("\n\nMaster configuration:");
85 out.println(LINE);
86 Configuration conf = master.getConfiguration();
87 out.flush();
88 conf.writeXml(os);
89 os.flush();
90
91 out.println("\n\nRecent regionserver aborts:");
92 out.println(LINE);
93 master.getRegionServerFatalLogBuffer().dumpTo(out);
94
95 out.println("\n\nLogs");
96 out.println(LINE);
97 long tailKb = getTailKbParam(request);
98 LogMonitoring.dumpTailOfLogs(out, tailKb);
99
100 out.flush();
101 }
102
103
104 private void dumpRIT(HMaster master, PrintWriter out) {
105 NavigableMap<String, RegionState> regionsInTransition =
106 master.getAssignmentManager().getRegionsInTransition();
107 for (Map.Entry<String, RegionState> e : regionsInTransition.entrySet()) {
108 String rid = e.getKey();
109 RegionState rs = e.getValue();
110 out.println("Region " + rid + ": " + rs.toDescriptiveString());
111 }
112 }
113
114 private void dumpServers(HMaster master, PrintWriter out) {
115 Map<ServerName, HServerLoad> servers =
116 master.getServerManager().getOnlineServers();
117 for (Map.Entry<ServerName, HServerLoad> e : servers.entrySet()) {
118 out.println(e.getKey() + ": " + e.getValue());
119 }
120 }
121 }