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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 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.master;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
The servlet responsible for rendering the index page of the master.
 public class MasterStatusServlet extends HttpServlet {
   private static final Log LOG = LogFactory.getLog(MasterStatusServlet.class);
   private static final long serialVersionUID = 1L;
   public void doGet(HttpServletRequest requestHttpServletResponse response)
     throws IOException
     assert master != null : "No Master in context!";
     Configuration conf = master.getConfiguration();
     HBaseAdmin admin = new HBaseAdmin(conf);
     Map<StringIntegerfrags = getFragmentationInfo(masterconf);
     ServerName metaLocation = null;
     List<ServerNameservers = null;
     Set<ServerNamedeadServers = null;
     if(master.isActiveMaster()) {
       if (master.getServerManager() == null) {
         response.sendError(503, "Master not ready");
       metaLocation = getMetaLocationOrNull(master);
       //ServerName metaLocation = master.getCatalogTracker().getMetaLocation();
       servers = master.getServerManager().getOnlineServersList();
       deadServers = master.getServerManager().getDeadServers().copyServerNames();
     MasterStatusTmpl tmpl;
     try {
        tmpl = new MasterStatusTmpl()
     } catch (ServiceException s) {
       throw new IOException(s);
     if (request.getParameter("filter") != null)
     if (request.getParameter("format") != null)
   private ServerName getMetaLocationOrNull(HMaster master) {
    try {
      return (master.getCatalogTracker() == null) ? null : master.getCatalogTracker().getMetaLocation();
    } catch (InterruptedException e) {
      .warn("Unable to get meta location"e);
      return null;
      HMaster masterConfiguration confthrows IOException {
    boolean showFragmentation = conf.getBoolean(
    if (showFragmentation) {
      return FSUtils.getTableFragmentation(master);
    } else {
      return null;
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