| /** |
| * |
| * 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.master; |
| |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hbase.ServerName; |
| import org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl; |
| import org.apache.hadoop.hbase.util.FSUtils; |
| import org.apache.hadoop.hbase.zookeeper.MetaTableLocator; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| /** |
| * The servlet responsible for rendering the index page of the |
| * master. |
| */ |
| @InterfaceAudience.Private |
| public class MasterStatusServlet extends HttpServlet { |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| public void doGet(HttpServletRequest request, HttpServletResponse response) |
| throws IOException |
| { |
| HMaster master = (HMaster) getServletContext().getAttribute(HMaster.MASTER); |
| assert master != null : "No Master in context!"; |
| |
| response.setContentType("text/html"); |
| |
| Configuration conf = master.getConfiguration(); |
| |
| Map<String, Integer> frags = getFragmentationInfo(master, conf); |
| ServerName metaLocation = null; |
| List<ServerName> servers = null; |
| Set<ServerName> deadServers = null; |
| |
| if(master.isActiveMaster()) { |
| metaLocation = getMetaLocationOrNull(master); |
| ServerManager serverManager = master.getServerManager(); |
| if (serverManager != null) { |
| deadServers = serverManager.getDeadServers().copyServerNames(); |
| servers = serverManager.getOnlineServersList(); |
| } |
| } |
| |
| MasterStatusTmpl tmpl = new MasterStatusTmpl() |
| .setFrags(frags) |
| .setMetaLocation(metaLocation) |
| .setServers(servers) |
| .setDeadServers(deadServers) |
| .setCatalogJanitorEnabled(master.isCatalogJanitorEnabled()); |
| |
| if (request.getParameter("filter") != null) |
| tmpl.setFilter(request.getParameter("filter")); |
| if (request.getParameter("format") != null) |
| tmpl.setFormat(request.getParameter("format")); |
| tmpl.render(response.getWriter(), master); |
| } |
| |
| private ServerName getMetaLocationOrNull(HMaster master) { |
| return MetaTableLocator.getMetaRegionLocation(master.getZooKeeper()); |
| } |
| |
| private Map<String, Integer> getFragmentationInfo( |
| HMaster master, Configuration conf) throws IOException { |
| boolean showFragmentation = conf.getBoolean( |
| "hbase.master.ui.fragmentation.enabled", false); |
| if (showFragmentation) { |
| return FSUtils.getTableFragmentation(master); |
| } else { |
| return null; |
| } |
| } |
| } |