| /** |
| * 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.datanode; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hdfs.DFSClient; |
| import org.apache.hadoop.hdfs.server.common.JspHelper; |
| import org.apache.hadoop.net.NetUtils; |
| import org.apache.hadoop.security.UserGroupInformation; |
| |
| import javax.servlet.http.HttpServletRequest; |
| import java.io.IOException; |
| import java.security.PrivilegedExceptionAction; |
| |
| @InterfaceAudience.Private |
| public class DatanodeJspHelper { |
| private static DFSClient getDFSClient(final UserGroupInformation user, |
| final String addr, |
| final Configuration conf |
| ) throws IOException, |
| InterruptedException { |
| return |
| user.doAs(new PrivilegedExceptionAction<DFSClient>() { |
| @Override |
| public DFSClient run() throws IOException { |
| return new DFSClient(NetUtils.createSocketAddr(addr), conf); |
| } |
| }); |
| } |
| |
| /** Get DFSClient for a namenode corresponding to the BPID from a datanode */ |
| public static DFSClient getDFSClient(final HttpServletRequest request, |
| final DataNode datanode, final Configuration conf, |
| final UserGroupInformation ugi) throws IOException, InterruptedException { |
| final String nnAddr = request.getParameter(JspHelper.NAMENODE_ADDRESS); |
| return getDFSClient(ugi, nnAddr, conf); |
| } |
| } |