hadoop/src/java/org/apache/hadoop/dfs/FsckServlet.java

/**
 * 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.dfs;

import java.util.*;
import java.io.*;
import org.apache.hadoop.mapred.StatusHttpServer;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.conf.*;
import org.apache.commons.logging.*;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * This class is used in Namesystem's jetty to do fsck on namenode.
 * @author Milind Bhandarkar
 */
public class FsckServlet extends HttpServlet {

  private static final Log LOG = LogFactory.getLog("org.apache.hadoop.dfs.FSNamesystem");

  @SuppressWarnings("unchecked")
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response
                    ) throws ServletException, IOException {
    Map<String,String[]> pmap = request.getParameterMap();
    try {
      ServletContext context = getServletContext();
      NameNode nn = (NameNode) context.getAttribute("name.node");
      Configuration conf = (Configuration) context.getAttribute("name.conf");
      NamenodeFsck fscker = new NamenodeFsck(conf, nn, pmap, response);
      fscker.fsck();
    } catch (IOException ie) {
      StringUtils.stringifyException(ie);
      LOG.warn(ie);
      String errMsg = "Fsck on path " + pmap.get("path") + " failed.";
      response.sendError(HttpServletResponse.SC_GONE, errMsg);
      throw ie;
    }
  }
}