001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.master.http;
019
020import java.io.IOException;
021import java.io.OutputStream;
022import java.io.PrintStream;
023import java.io.PrintWriter;
024import java.util.Date;
025import java.util.Map;
026import javax.servlet.http.HttpServletRequest;
027import javax.servlet.http.HttpServletResponse;
028import org.apache.hadoop.conf.Configuration;
029import org.apache.hadoop.hbase.ServerMetrics;
030import org.apache.hadoop.hbase.ServerName;
031import org.apache.hadoop.hbase.master.HMaster;
032import org.apache.hadoop.hbase.master.ServerManager;
033import org.apache.hadoop.hbase.master.assignment.AssignmentManager;
034import org.apache.hadoop.hbase.master.assignment.RegionStateNode;
035import org.apache.hadoop.hbase.monitoring.StateDumpServlet;
036import org.apache.hadoop.hbase.monitoring.TaskMonitor;
037import org.apache.hadoop.hbase.regionserver.http.RSDumpServlet;
038import org.apache.hadoop.hbase.util.LogMonitoring;
039import org.apache.hadoop.hbase.util.Threads;
040import org.apache.yetus.audience.InterfaceAudience;
041
042@InterfaceAudience.Private
043public class MasterDumpServlet extends StateDumpServlet {
044  private static final long serialVersionUID = 1L;
045  private static final String LINE = "===========================================================";
046
047  @Override
048  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
049    HMaster master = (HMaster) getServletContext().getAttribute(HMaster.MASTER);
050    assert master != null : "No Master in context!";
051
052    response.setContentType("text/plain");
053    OutputStream os = response.getOutputStream();
054    try (PrintWriter out = new PrintWriter(os)) {
055
056      out.println("Master status for " + master.getServerName() + " as of " + new Date());
057
058      out.println("\n\nVersion Info:");
059      out.println(LINE);
060      dumpVersionInfo(out);
061
062      out.println("\n\nTasks:");
063      out.println(LINE);
064      TaskMonitor.get().dumpAsText(out);
065
066      out.println("\n\nServers:");
067      out.println(LINE);
068      dumpServers(master, out);
069
070      out.println("\n\nRegions-in-transition:");
071      out.println(LINE);
072      dumpRIT(master, out);
073
074      out.println("\n\nExecutors:");
075      out.println(LINE);
076      dumpExecutors(master.getExecutorService(), out);
077
078      out.println("\n\nStacks:");
079      out.println(LINE);
080      out.flush();
081      PrintStream ps = new PrintStream(response.getOutputStream(), false, "UTF-8");
082      Threads.printThreadInfo(ps, "");
083      ps.flush();
084
085      out.println("\n\nMaster configuration:");
086      out.println(LINE);
087      Configuration conf = master.getConfiguration();
088      out.flush();
089      conf.writeXml(os);
090      os.flush();
091
092      out.println("\n\nRecent regionserver aborts:");
093      out.println(LINE);
094      master.getRegionServerFatalLogBuffer().dumpTo(out);
095
096      out.println("\n\nLogs");
097      out.println(LINE);
098      long tailKb = getTailKbParam(request);
099      LogMonitoring.dumpTailOfLogs(out, tailKb);
100
101      out.println("\n\nRS Queue:");
102      out.println(LINE);
103      if (isShowQueueDump(conf)) {
104        RSDumpServlet.dumpQueue(master, out);
105      }
106      out.flush();
107    }
108  }
109
110  private void dumpRIT(HMaster master, PrintWriter out) {
111    AssignmentManager am = master.getAssignmentManager();
112    if (am == null) {
113      out.println("AssignmentManager is not initialized");
114      return;
115    }
116
117    for (RegionStateNode rs : am.getRegionsInTransition()) {
118      String rid = rs.getRegionInfo().getEncodedName();
119      out.println("Region " + rid + ": " + rs.toDescriptiveString());
120    }
121  }
122
123  private void dumpServers(HMaster master, PrintWriter out) {
124    ServerManager sm = master.getServerManager();
125    if (sm == null) {
126      out.println("ServerManager is not initialized");
127      return;
128    }
129
130    Map<ServerName, ServerMetrics> servers = sm.getOnlineServers();
131    for (Map.Entry<ServerName, ServerMetrics> e : servers.entrySet()) {
132      out.println(e.getKey() + ": " + e.getValue());
133    }
134  }
135}