org.apache.hadoop.mapreduce.lib.input
Class SequenceFileAsTextRecordReader

java.lang.Object
  org.apache.hadoop.mapreduce.RecordReader<Text,Text>
      org.apache.hadoop.mapreduce.lib.input.SequenceFileAsTextRecordReader

All Implemented Interfaces:

Closeable

@InterfaceAudience.Public
@InterfaceStability.Stable
public class SequenceFileAsTextRecordReader
extends RecordReader<Text,Text>

This class converts the input keys and values to their String forms by calling toString() method. This class to SequenceFileAsTextInputFormat class is as LineRecordReader class to TextInputFormat class.

Constructor Summary

SequenceFileAsTextRecordReader()

Method Summary

void	close() Close the record reader.
Text	getCurrentKey() Get the current key
Text	getCurrentValue() Get the current value.
float	getProgress() The current progress of the record reader through its data.
void	initialize(InputSplit split, TaskAttemptContext context) Called once at initialization.
boolean	nextKeyValue() Read key/value pair in a line.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SequenceFileAsTextRecordReader

public SequenceFileAsTextRecordReader()
                               throws IOException

Throws:

IOException

Method Detail

initialize

public void initialize(InputSplit split,
                       TaskAttemptContext context)
                throws IOException,
                       InterruptedException

Description copied from class: RecordReader

Called once at initialization.

Specified by:

initialize in class RecordReader<Text,Text>

Parameters:

split - the split that defines the range of records to read

context - the information about the task

Throws:

IOException

InterruptedException

getCurrentKey

public Text getCurrentKey()
                   throws IOException,
                          InterruptedException

Description copied from class: RecordReader

Get the current key

Specified by:

getCurrentKey in class RecordReader<Text,Text>

Returns:

the current key or null if there is no current key

Throws:

IOException

InterruptedException

getCurrentValue

public Text getCurrentValue()
                     throws IOException,
                            InterruptedException

Description copied from class: RecordReader

Get the current value.

Specified by:

getCurrentValue in class RecordReader<Text,Text>

Returns:

the object that was read

Throws:

IOException

InterruptedException

nextKeyValue

public boolean nextKeyValue()
                     throws IOException,
                            InterruptedException

Read key/value pair in a line.

Specified by:

nextKeyValue in class RecordReader<Text,Text>

Returns:

true if a key/value pair was read

Throws:

IOException

InterruptedException

getProgress

public float getProgress()
                  throws IOException,
                         InterruptedException

Description copied from class: RecordReader

The current progress of the record reader through its data.

Specified by:

getProgress in class RecordReader<Text,Text>

Returns:

a number between 0.0 and 1.0 that is the fraction of the data read

Throws:

IOException

InterruptedException

close

public void close()
           throws IOException

Description copied from class: RecordReader

Close the record reader.

Specified by:

close in interface Closeable

Specified by:

close in class RecordReader<Text,Text>

Throws:

IOException