| /** |
| * 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.tools; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.IOUtils; |
| import org.apache.hadoop.security.Credentials; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.nio.charset.Charset; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * FileBasedCopyListing implements the CopyListing interface, |
| * to create the copy-listing for DistCp, |
| * by iterating over all source paths mentioned in a specified input-file. |
| */ |
| public class FileBasedCopyListing extends CopyListing { |
| |
| private final CopyListing globbedListing; |
| /** |
| * Constructor, to initialize base-class. |
| * @param configuration The input Configuration object. |
| * @param credentials - Credentials object on which the FS delegation tokens are cached. If null |
| * delegation token caching is skipped |
| */ |
| public FileBasedCopyListing(Configuration configuration, Credentials credentials) { |
| super(configuration, credentials); |
| globbedListing = new GlobbedCopyListing(getConf(), credentials); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| protected void validatePaths(DistCpOptions options) |
| throws IOException, InvalidInputException { |
| } |
| |
| /** |
| * Implementation of CopyListing::buildListing(). |
| * Iterates over all source paths mentioned in the input-file. |
| * @param pathToListFile Path on HDFS where the listing file is written. |
| * @param options Input Options for DistCp (indicating source/target paths.) |
| * @throws IOException |
| */ |
| @Override |
| public void doBuildListing(Path pathToListFile, DistCpOptions options) throws IOException { |
| DistCpOptions newOption = new DistCpOptions(options); |
| newOption.setSourcePaths(fetchFileList(options.getSourceFileListing())); |
| globbedListing.buildListing(pathToListFile, newOption); |
| } |
| |
| private List<Path> fetchFileList(Path sourceListing) throws IOException { |
| List<Path> result = new ArrayList<Path>(); |
| FileSystem fs = sourceListing.getFileSystem(getConf()); |
| BufferedReader input = null; |
| try { |
| input = new BufferedReader(new InputStreamReader(fs.open(sourceListing), |
| Charset.forName("UTF-8"))); |
| String line = input.readLine(); |
| while (line != null) { |
| result.add(new Path(line)); |
| line = input.readLine(); |
| } |
| } finally { |
| IOUtils.closeStream(input); |
| } |
| return result; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| protected long getBytesToCopy() { |
| return globbedListing.getBytesToCopy(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| protected long getNumberOfPaths() { |
| return globbedListing.getNumberOfPaths(); |
| } |
| } |