hadoop RouterFsckServlet 源码
haddop RouterFsckServlet 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterFsckServlet.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.hdfs.server.federation.router;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
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.server.namenode.DfsServlet;
import org.apache.hadoop.security.UserGroupInformation;
/**
* This class is used in Namesystem's web server to do fsck on namenode.
*/
@InterfaceAudience.Private
public class RouterFsckServlet extends DfsServlet {
/** for java.io.Serializable. */
private static final long serialVersionUID = 1L;
public static final String SERVLET_NAME = "fsck";
public static final String PATH_SPEC = "/fsck";
/** Handle fsck request. */
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException {
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 = RouterHttpServer.getConfFromContext(context);
final UserGroupInformation ugi = getUGI(request, conf);
try {
ugi.doAs((PrivilegedExceptionAction<Object>) () -> {
Router router = RouterHttpServer.getRouterFromContext(context);
new RouterFsck(router, pmap, out, remoteAddress).fsck();
return null;
});
} catch (InterruptedException e) {
response.sendError(HttpURLConnection.HTTP_BAD_REQUEST, e.getMessage());
}
}
}
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