/**
* 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.ServerName;
import com.alibaba.wasp.client.WaspAdmin;
import com.alibaba.wasp.tmpl.master.MasterStatusTmpl;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.util.FSUtils;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
import java.util.Set;
/**
* The servlet responsible for rendering the index page of the master.
*/
public class FMasterStatusServlet extends HttpServlet {
private static final Log LOG = LogFactory.getLog(FMasterStatusServlet.class);
private static final long serialVersionUID = 1L;
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException {
FMaster master = (FMaster) getServletContext().getAttribute(FMaster.MASTER);
assert master != null : "No Master in context!";
Configuration conf = master.getConfiguration();
WaspAdmin admin = new WaspAdmin(conf);
List<ServerName> servers = master.getFServerManager()
.getOnlineServersList();
Set<ServerName> deadServers = master.getFServerManager().getDeadServers();
response.setContentType("text/html");
MasterStatusTmpl tmpl = new MasterStatusTmpl()
.setShowAppendWarning(shouldShowAppendWarning(conf))
.setServers(servers).setDeadServers(deadServers);
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, admin);
}
static boolean shouldShowAppendWarning(Configuration conf) {
try {
return !FSUtils.isAppendSupported(conf) && FSUtils.isHDFS(conf);
} catch (IOException e) {
LOG.warn("Unable to determine if append is supported", e);
return false;
}
}
}