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