org.apache.hadoop.mapred
Class TextInputFormat

java.lang.Object
  extended by org.apache.hadoop.mapred.FileInputFormat<LongWritable,Text>
      extended by org.apache.hadoop.mapred.TextInputFormat
All Implemented Interfaces:
InputFormat<LongWritable,Text>, JobConfigurable

@InterfaceAudience.Public
@InterfaceStability.Stable
public class TextInputFormat
extends FileInputFormat<LongWritable,Text>
implements JobConfigurable

An InputFormat for plain text files. Files are broken into lines. Either linefeed or carriage-return are used to signal end of line. Keys are the position in the file, and values are the line of text..


Field Summary
 
Fields inherited from class org.apache.hadoop.mapred.FileInputFormat
INPUT_DIR_RECURSIVE, LOG, NUM_INPUT_FILES
 
Constructor Summary
TextInputFormat()
           
 
Method Summary
 void configure(JobConf conf)
          Initializes a new instance from a JobConf.
 RecordReader<LongWritable,Text> getRecordReader(InputSplit genericSplit, JobConf job, Reporter reporter)
          Get the RecordReader for the given InputSplit.
protected  boolean isSplitable(FileSystem fs, Path file)
          Is the given filename splitable? Usually, true, but if the file is stream compressed, it will not be.
 
Methods inherited from class org.apache.hadoop.mapred.FileInputFormat
addInputPath, addInputPathRecursively, addInputPaths, computeSplitSize, getBlockIndex, getInputPathFilter, getInputPaths, getSplitHosts, getSplits, listStatus, makeSplit, setInputPathFilter, setInputPaths, setInputPaths, setMinSplitSize
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

TextInputFormat

public TextInputFormat()
Method Detail

configure

public void configure(JobConf conf)
Description copied from interface: JobConfigurable
Initializes a new instance from a JobConf.

Specified by:
configure in interface JobConfigurable
Parameters:
conf - the configuration

isSplitable

protected boolean isSplitable(FileSystem fs,
                              Path file)
Description copied from class: FileInputFormat
Is the given filename splitable? Usually, true, but if the file is stream compressed, it will not be. FileInputFormat implementations can override this and return false to ensure that individual input files are never split-up so that Mappers process entire files.

Overrides:
isSplitable in class FileInputFormat<LongWritable,Text>
Parameters:
fs - the file system that the file is on
file - the file name to check
Returns:
is this file splitable?

getRecordReader

public RecordReader<LongWritable,Text> getRecordReader(InputSplit genericSplit,
                                                       JobConf job,
                                                       Reporter reporter)
                                                throws IOException
Description copied from interface: InputFormat
Get the RecordReader for the given InputSplit.

It is the responsibility of the RecordReader to respect record boundaries while processing the logical split to present a record-oriented view to the individual task.

Specified by:
getRecordReader in interface InputFormat<LongWritable,Text>
Specified by:
getRecordReader in class FileInputFormat<LongWritable,Text>
Parameters:
genericSplit - the InputSplit
job - the job that this split belongs to
Returns:
a RecordReader
Throws:
IOException


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