001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 019 package org.apache.hadoop.mapred; 020 021 import java.io.DataInput; 022 import java.io.DataOutput; 023 import java.io.IOException; 024 import java.util.HashSet; 025 import java.util.Set; 026 027 import org.apache.hadoop.classification.InterfaceAudience; 028 import org.apache.hadoop.classification.InterfaceStability; 029 import org.apache.hadoop.fs.FileStatus; 030 import org.apache.hadoop.fs.FileSystem; 031 import org.apache.hadoop.fs.Path; 032 import org.apache.hadoop.fs.BlockLocation; 033 import org.apache.hadoop.io.Text; 034 import org.apache.hadoop.io.Text; 035 import org.apache.hadoop.mapred.lib.CombineFileSplit; 036 037 /** 038 * A sub-collection of input files. Unlike {@link FileSplit}, MultiFileSplit 039 * class does not represent a split of a file, but a split of input files 040 * into smaller sets. The atomic unit of split is a file. <br> 041 * MultiFileSplit can be used to implement {@link RecordReader}'s, with 042 * reading one record per file. 043 * @see FileSplit 044 * @see MultiFileInputFormat 045 * @deprecated Use {@link org.apache.hadoop.mapred.lib.CombineFileSplit} instead 046 */ 047 @Deprecated 048 @InterfaceAudience.Public 049 @InterfaceStability.Stable 050 public class MultiFileSplit extends CombineFileSplit { 051 052 MultiFileSplit() {} 053 054 public MultiFileSplit(JobConf job, Path[] files, long[] lengths) { 055 super(job, files, lengths); 056 } 057 058 public String[] getLocations() throws IOException { 059 HashSet<String> hostSet = new HashSet<String>(); 060 for (Path file : getPaths()) { 061 FileSystem fs = file.getFileSystem(getJob()); 062 FileStatus status = fs.getFileStatus(file); 063 BlockLocation[] blkLocations = fs.getFileBlockLocations(status, 064 0, status.getLen()); 065 if (blkLocations != null && blkLocations.length > 0) { 066 addToSet(hostSet, blkLocations[0].getHosts()); 067 } 068 } 069 return hostSet.toArray(new String[hostSet.size()]); 070 } 071 072 private void addToSet(Set<String> set, String[] array) { 073 for(String s:array) 074 set.add(s); 075 } 076 077 @Override 078 public String toString() { 079 StringBuffer sb = new StringBuffer(); 080 for(int i=0; i < getPaths().length; i++) { 081 sb.append(getPath(i).toUri().getPath() + ":0+" + getLength(i)); 082 if (i < getPaths().length -1) { 083 sb.append("\n"); 084 } 085 } 086 087 return sb.toString(); 088 } 089 } 090