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.regionserver.http;
019
020import java.io.IOException;
021import java.io.OutputStream;
022import java.io.PrintStream;
023import java.io.PrintWriter;
024import java.util.Date;
025import javax.servlet.http.HttpServletRequest;
026import javax.servlet.http.HttpServletResponse;
027import org.apache.hadoop.conf.Configuration;
028import org.apache.hadoop.hbase.http.HttpServer;
029import org.apache.hadoop.hbase.ipc.CallQueueInfo;
030import org.apache.hadoop.hbase.monitoring.StateDumpServlet;
031import org.apache.hadoop.hbase.monitoring.TaskMonitor;
032import org.apache.hadoop.hbase.regionserver.CompactSplit;
033import org.apache.hadoop.hbase.regionserver.HRegionServer;
034import org.apache.hadoop.hbase.regionserver.MemStoreFlusher;
035import org.apache.hadoop.hbase.util.LogMonitoring;
036import org.apache.hadoop.hbase.util.Threads;
037import org.apache.yetus.audience.InterfaceAudience;
038
039@InterfaceAudience.Private
040public class RSDumpServlet extends StateDumpServlet {
041  private static final long serialVersionUID = 1L;
042  private static final String LINE = "===========================================================";
043
044  @Override
045  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
046    if (!HttpServer.isInstrumentationAccessAllowed(getServletContext(), request, response)) {
047      return;
048    }
049    HRegionServer hrs =
050      (HRegionServer) getServletContext().getAttribute(HRegionServer.REGIONSERVER);
051    assert hrs != null : "No RS in context!";
052
053    response.setContentType("text/plain");
054
055    if (!hrs.isOnline()) {
056      response.getWriter().write("The RegionServer is initializing!");
057      response.getWriter().close();
058      return;
059    }
060
061    OutputStream os = response.getOutputStream();
062    try (PrintWriter out = new PrintWriter(os)) {
063
064      out.println("RegionServer status for " + hrs.getServerName() + " as of " + new Date());
065
066      out.println("\n\nVersion Info:");
067      out.println(LINE);
068      dumpVersionInfo(out);
069
070      out.println("\n\nTasks:");
071      out.println(LINE);
072      TaskMonitor.get().dumpAsText(out);
073
074      out.println("\n\nRowLocks:");
075      out.println(LINE);
076      hrs.dumpRowLocks(out);
077
078      out.println("\n\nExecutors:");
079      out.println(LINE);
080      dumpExecutors(hrs.getExecutorService(), out);
081
082      out.println("\n\nStacks:");
083      out.println(LINE);
084      PrintStream ps = new PrintStream(response.getOutputStream(), false, "UTF-8");
085      Threads.printThreadInfo(ps, "");
086      ps.flush();
087
088      out.println("\n\nRS Configuration:");
089      out.println(LINE);
090      Configuration conf = hrs.getConfiguration();
091      out.flush();
092      conf.writeXml(os);
093      os.flush();
094
095      out.println("\n\nLogs");
096      out.println(LINE);
097      long tailKb = getTailKbParam(request);
098      LogMonitoring.dumpTailOfLogs(out, tailKb);
099
100      out.println("\n\nRS Queue:");
101      out.println(LINE);
102      if (isShowQueueDump(conf)) {
103        dumpQueue(hrs, out);
104      }
105
106      out.println("\n\nCall Queue Summary:");
107      out.println(LINE);
108      dumpCallQueues(hrs, out);
109
110      out.flush();
111    }
112  }
113
114  public static void dumpQueue(HRegionServer hrs, PrintWriter out) {
115    final CompactSplit compactSplit = hrs.getCompactSplitThread();
116    if (compactSplit != null) {
117      // 1. Print out Compaction/Split Queue
118      out.println("Compaction/Split Queue summary: " + compactSplit);
119      out.println(compactSplit.dumpQueue());
120    }
121
122    final MemStoreFlusher memStoreFlusher = hrs.getMemStoreFlusher();
123    if (memStoreFlusher != null) {
124      // 2. Print out flush Queue
125      out.println();
126      out.println("Flush Queue summary: " + memStoreFlusher);
127      out.println(memStoreFlusher.dumpQueue());
128    }
129  }
130
131  public static void dumpCallQueues(HRegionServer hrs, PrintWriter out) {
132    CallQueueInfo callQueueInfo = hrs.getRpcServer().getScheduler().getCallQueueInfo();
133
134    for (String queueName : callQueueInfo.getCallQueueNames()) {
135
136      out.println("\nQueue Name: " + queueName);
137
138      long totalCallCount = 0L, totalCallSize = 0L;
139      for (String methodName : callQueueInfo.getCalledMethodNames(queueName)) {
140        long thisMethodCount, thisMethodSize;
141        thisMethodCount = callQueueInfo.getCallMethodCount(queueName, methodName);
142        thisMethodSize = callQueueInfo.getCallMethodSize(queueName, methodName);
143
144        out.println("Method in call: " + methodName);
145        out.println("Total call count for method: " + thisMethodCount);
146        out.println("Total call size for method (bytes): " + thisMethodSize);
147
148        totalCallCount += thisMethodCount;
149        totalCallSize += thisMethodSize;
150      }
151      out.println("Total call count for queue: " + totalCallCount);
152      out.println("Total call size for queue (bytes): " + totalCallSize);
153    }
154  }
155}