/**
* 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.hdfs.server.namenode;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.security.PrivilegedExceptionAction;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.DatanodeReportType;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
import org.apache.hadoop.security.UserGroupInformation;
/**
* This class is used in Namesystem's web server to do fsck on namenode.
*/
@InterfaceAudience.Private
public class FsckServlet extends DfsServlet {
/** for java.io.Serializable */
private static final long serialVersionUID = 1L;
/** Handle fsck request */
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response
) throws IOException {
@SuppressWarnings("unchecked")
final Map<String,String[]> pmap = request.getParameterMap();
final PrintWriter out = response.getWriter();
final InetAddress remoteAddress =
InetAddress.getByName(request.getRemoteAddr());
final ServletContext context = getServletContext();
final Configuration conf = NameNodeHttpServer.getConfFromContext(context);
final UserGroupInformation ugi = getUGI(request, conf);
try {
ugi.doAs(new PrivilegedExceptionAction<Object>() {
@Override
public Object run() throws Exception {
NameNode nn = NameNodeHttpServer.getNameNodeFromContext(context);
final FSNamesystem namesystem = nn.getNamesystem();
final BlockManager bm = namesystem.getBlockManager();
final int totalDatanodes =
namesystem.getNumberOfDatanodes(DatanodeReportType.LIVE);
new NamenodeFsck(conf, nn,
bm.getDatanodeManager().getNetworkTopology(), pmap, out,
totalDatanodes, bm.minReplication, remoteAddress).fsck();
return null;
}
});
} catch (InterruptedException e) {
response.sendError(400, e.getMessage());
}
}
}