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Server functionality for HBase
/*
* 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.http;
import static org.apache.hadoop.hbase.util.DNS.MASTER_HOSTNAME_KEY;
import java.io.IOException;
import java.net.InetAddress;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.hadoop.hbase.http.InfoServer;
import org.apache.hadoop.hbase.util.Addressing;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@InterfaceAudience.Private
public class MasterRedirectServlet extends HttpServlet {
private static final long serialVersionUID = 2894774810058302473L;
private static final Logger LOG = LoggerFactory.getLogger(MasterRedirectServlet.class);
private final int regionServerInfoPort;
private final String regionServerHostname;
/**
* @param infoServer that we're trying to send all requests to
* @param hostname may be null. if given, will be used for redirects instead of host from
* client.
*/
public MasterRedirectServlet(InfoServer infoServer, String hostname) {
regionServerInfoPort = infoServer.getPort();
regionServerHostname = hostname;
}
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String redirectHost = regionServerHostname;
if (redirectHost == null) {
redirectHost = request.getServerName();
if (!Addressing.isLocalAddress(InetAddress.getByName(redirectHost))) {
LOG.warn("Couldn't resolve '" + redirectHost + "' as an address local to this node and '"
+ MASTER_HOSTNAME_KEY + "' is not set; client will get an HTTP 400 response. If "
+ "your HBase deployment relies on client accessible names that the region server "
+ "process can't resolve locally, then you should set the previously mentioned "
+ "configuration variable to an appropriate hostname.");
// no sending client provided input back to the client, so the goal host is just in the
// logs.
response.sendError(400,
"Request was to a host that I can't resolve for any of the network interfaces on "
+ "this node. If this is due to an intermediary such as an HTTP load balancer or "
+ "other proxy, your HBase administrator can set '" + MASTER_HOSTNAME_KEY
+ "' to point to the correct hostname.");
return;
}
}
// TODO: this scheme should come from looking at the scheme registered in the infoserver's http
// server for the host and port we're using, but it's buried way too deep to do that ATM.
String redirectUrl = request.getScheme() + "://" + redirectHost + ":" + regionServerInfoPort
+ request.getRequestURI();
response.sendRedirect(redirectUrl);
}
}