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1   /**
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *     http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing, software
14   * distributed under the License is distributed on an "AS IS" BASIS,
15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16   * See the License for the specific language governing permissions and
17   * limitations under the License.
18   */
19  package org.apache.hadoop.hbase.regionserver;
20  
21  import java.io.IOException;
22  import java.io.OutputStream;
23  import java.io.PrintWriter;
24  import java.util.Date;
25  
26  import javax.servlet.http.HttpServletRequest;
27  import javax.servlet.http.HttpServletResponse;
28  
29  import org.apache.hadoop.classification.InterfaceAudience;
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  @InterfaceAudience.Private
37  public class RSDumpServlet extends StateDumpServlet {
38    private static final long serialVersionUID = 1L;
39    private static final String LINE =
40      "===========================================================";
41    
42    @Override
43    public void doGet(HttpServletRequest request, HttpServletResponse response)
44        throws IOException {
45      HRegionServer hrs = (HRegionServer)getServletContext().getAttribute(
46          HRegionServer.REGIONSERVER);
47      assert hrs != null : "No RS in context!";
48  
49      response.setContentType("text/plain");
50   
51      if (!hrs.isOnline()) {
52        response.getWriter().write("The RegionServer is initializing!");
53        response.getWriter().close();
54        return;
55      }
56  
57      OutputStream os = response.getOutputStream();
58      PrintWriter out = new PrintWriter(os);
59      
60      out.println("RegionServer status for " + hrs.getServerName()
61          + " as of " + new Date());
62      
63      out.println("\n\nVersion Info:");
64      out.println(LINE);
65      dumpVersionInfo(out);
66  
67      out.println("\n\nTasks:");
68      out.println(LINE);
69      TaskMonitor.get().dumpAsText(out);
70      
71      out.println("\n\nExecutors:");
72      out.println(LINE);
73      dumpExecutors(hrs.getExecutorService(), out);
74      
75      out.println("\n\nStacks:");
76      out.println(LINE);
77      ReflectionUtils.printThreadInfo(out, "");
78      
79      out.println("\n\nRS Configuration:");
80      out.println(LINE);
81      Configuration conf = hrs.getConfiguration();
82      out.flush();
83      conf.writeXml(os);
84      os.flush();
85      
86      out.println("\n\nLogs");
87      out.println(LINE);
88      long tailKb = getTailKbParam(request);
89      LogMonitoring.dumpTailOfLogs(out, tailKb);
90      
91      out.println("\n\nRS Queue:");
92      out.println(LINE);
93      if(isShowQueueDump(conf)) {
94        dumpQueue(hrs, out);
95      } 
96      
97      out.flush();
98    }
99  
100   public static void dumpQueue(HRegionServer hrs, PrintWriter out)
101       throws IOException {
102     // 1. Print out Compaction/Split Queue
103     out.println("Compaction/Split Queue summary: " 
104         + hrs.compactSplitThread.toString() );
105     out.println(hrs.compactSplitThread.dumpQueue());
106 
107     // 2. Print out flush Queue
108     out.println("\nFlush Queue summary: "
109         + hrs.cacheFlusher.toString());
110     out.println(hrs.cacheFlusher.dumpQueue());
111   }
112 }