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.mapreduce.lib.input; 020 021 import org.apache.hadoop.classification.InterfaceAudience; 022 import org.apache.hadoop.classification.InterfaceStability; 023 import org.apache.hadoop.fs.Path; 024 import org.apache.hadoop.io.LongWritable; 025 import org.apache.hadoop.io.Text; 026 import org.apache.hadoop.io.compress.CompressionCodec; 027 import org.apache.hadoop.io.compress.CompressionCodecFactory; 028 import org.apache.hadoop.io.compress.SplittableCompressionCodec; 029 import org.apache.hadoop.mapreduce.InputFormat; 030 import org.apache.hadoop.mapreduce.InputSplit; 031 import org.apache.hadoop.mapreduce.JobContext; 032 import org.apache.hadoop.mapreduce.RecordReader; 033 import org.apache.hadoop.mapreduce.TaskAttemptContext; 034 035 /** An {@link InputFormat} for plain text files. Files are broken into lines. 036 * Either linefeed or carriage-return are used to signal end of line. Keys are 037 * the position in the file, and values are the line of text.. */ 038 @InterfaceAudience.Public 039 @InterfaceStability.Stable 040 public class TextInputFormat extends FileInputFormat<LongWritable, Text> { 041 042 @Override 043 public RecordReader<LongWritable, Text> 044 createRecordReader(InputSplit split, 045 TaskAttemptContext context) { 046 String delimiter = context.getConfiguration().get( 047 "textinputformat.record.delimiter"); 048 byte[] recordDelimiterBytes = null; 049 if (null != delimiter) 050 recordDelimiterBytes = delimiter.getBytes(); 051 return new LineRecordReader(recordDelimiterBytes); 052 } 053 054 @Override 055 protected boolean isSplitable(JobContext context, Path file) { 056 final CompressionCodec codec = 057 new CompressionCodecFactory(context.getConfiguration()).getCodec(file); 058 if (null == codec) { 059 return true; 060 } 061 return codec instanceof SplittableCompressionCodec; 062 } 063 064 }