content: /**
   * Copyright 2011 The Apache Software Foundation
   *
   * 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 com.alibaba.wasp.master;
  
  import com.alibaba.wasp.ServerLoad;
  import com.alibaba.wasp.ServerName;
  import com.alibaba.wasp.monitoring.StateDumpServlet;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.monitoring.LogMonitoring;
  import org.apache.hadoop.hbase.monitoring.TaskMonitor;
  import org.apache.hadoop.util.ReflectionUtils;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.io.PrintWriter;
  import java.util.Date;
  import java.util.Map;
  
  public class FMasterDumpServlet extends StateDumpServlet {
    private static final long serialVersionUID = 1L;
    private static final String LINE =
      "===========================================================";
    
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws IOException {
      FMaster master = (FMaster) getServletContext().getAttribute(FMaster.MASTER);
      assert master != null : "No Master in context!";
  
      response.setContentType("text/plain");
      OutputStream os = response.getOutputStream();
      PrintWriter out = new PrintWriter(os);
      
      out.println("Master status for " + master.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\nServers:");
      out.println(LINE);
      dumpServers(master, out);
      
      out.println("\n\nEntityGroups-in-transition:");
      out.println(LINE);
      dumpRIT(master, out);
      
      out.println("\n\nExecutors:");
      out.println(LINE);
      dumpExecutors(master.getExecutorService(), out);
      
      out.println("\n\nStacks:");
      out.println(LINE);
      ReflectionUtils.printThreadInfo(out, "");
      
      out.println("\n\nMaster configuration:");
      out.println(LINE);
      Configuration conf = master.getConfiguration();
      out.flush();
      conf.writeXml(os);
      os.flush();
      
  //    out.println("\n\nRecent fserver aborts:");
  //    out.println(LINE);
  //    master.getFServerFatalLogBuffer().dumpTo(out);
      
      out.println("\n\nLogs");
      out.println(LINE);
      long tailKb = getTailKbParam(request);
      LogMonitoring.dumpTailOfLogs(out, tailKb);
      
      out.flush();
    }
    
  
    private void dumpRIT(FMaster master, PrintWriter out) {
      Map<String, EntityGroupState> entityGroupsInTransition =
        master.getAssignmentManager().getEntityGroupStates().getEntityGroupsInTransition();
      for (Map.Entry<String, EntityGroupState> e : entityGroupsInTransition.entrySet()) {
        String rid = e.getKey();
        EntityGroupState entityGroupState = e.getValue();
        out.println("EntityGroup " + rid + ": " + entityGroupState.toDescriptiveString());
      }
    }
  
    private void dumpServers(FMaster master, PrintWriter out) {
      Map<ServerName, ServerLoad> servers =
        master.getFServerManager().getOnlineServers();
      for (Map.Entry<ServerName, ServerLoad> e : servers.entrySet()) {
        out.println(e.getKey() + ": " + e.getValue());
      }
    }
  }
  