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Server functionality for HBase
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/**
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hbase.regionserver;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.Date;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.monitoring.LogMonitoring;
import org.apache.hadoop.hbase.monitoring.StateDumpServlet;
import org.apache.hadoop.hbase.monitoring.TaskMonitor;
import org.apache.hadoop.hbase.util.Threads;

@InterfaceAudience.Private
public class RSDumpServlet extends StateDumpServlet {
  private static final long serialVersionUID = 1L;
  private static final String LINE =
    "===========================================================";

  @Override
  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws IOException {
    HRegionServer hrs = (HRegionServer)getServletContext().getAttribute(
        HRegionServer.REGIONSERVER);
    assert hrs != null : "No RS in context!";
    
    Configuration hrsconf = (Configuration)getServletContext().getAttribute(
        HRegionServer.REGIONSERVER_CONF);
    assert hrsconf != null : "No RS conf in context";

    response.setContentType("text/plain");

    if (!hrs.isOnline()) {
      response.getWriter().write("The RegionServer is initializing!");
      response.getWriter().close();
      return;
    }

    OutputStream os = response.getOutputStream();
    PrintWriter out = new PrintWriter(os);
    
    out.println("Master status for " + hrs.getServerName()
        + " as of " + new Date());
    
    out.println("\n\nVersion Info:");
    out.println(LINE);
    dumpVersionInfo(out);

    out.println("\n\nTasks:");
    out.println(LINE);
    TaskMonitor.get().dumpAsText(out);
    
    out.println("\n\nExecutors:");
    out.println(LINE);
    dumpExecutors(hrs.getExecutorService(), out);
    
    out.println("\n\nStacks:");
    out.println(LINE);
    PrintStream ps = new PrintStream(response.getOutputStream(), false, "UTF-8");
    Threads.printThreadInfo(ps, "");
    ps.flush();
    
    out.println("\n\nRS Configuration:");
    out.println(LINE);
    Configuration conf = hrs.getConfiguration();
    out.flush();
    conf.writeXml(os);
    os.flush();
    
    out.println("\n\nLogs");
    out.println(LINE);
    long tailKb = getTailKbParam(request);
    LogMonitoring.dumpTailOfLogs(out, tailKb);
    
    out.println("\n\nRS Queue:");
    out.println(LINE);
    if(isShowQueueDump(hrsconf)) {
      dumpQueue(hrs, out);
    } 
    
    out.flush();
  }
  
  private boolean isShowQueueDump(Configuration conf){
    return conf.getBoolean("hbase.regionserver.servlet.show.queuedump", true);
  }
    
  private void dumpQueue(HRegionServer hrs, PrintWriter out)
      throws IOException {
    // 1. Print out Compaction/Split Queue
    out.println("Compaction/Split Queue summary: " 
        + hrs.compactSplitThread.toString() );
    out.println(hrs.compactSplitThread.dumpQueue());

    // 2. Print out flush Queue
    out.println("\nFlush Queue summary: "
        + hrs.cacheFlusher.toString());
    out.println(hrs.cacheFlusher.dumpQueue());
  }
  
}