org.apache.hadoop.mapred

Class SequenceFileAsTextRecordReader

java.lang.Object

org.apache.hadoop.mapred.SequenceFileAsTextRecordReader

All Implemented Interfaces:

RecordReader<Text,Text>

@InterfaceAudience.Public
@InterfaceStability.Stable
public class SequenceFileAsTextRecordReader
extends Object
implements 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

Constructors

Constructor and Description
SequenceFileAsTextRecordReader(Configuration conf, FileSplit split)

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Close this InputSplit to future operations.
Text	createKey() Create an object of the appropriate type to be used as a key.
Text	createValue() Create an object of the appropriate type to be used as a value.
long	getPos() Returns the current position in the input.
float	getProgress() How much of the input has the RecordReader consumed i.e.
boolean	next(Text key, Text value) 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(Configuration conf,
                              FileSplit split)
                               throws IOException

Throws:

IOException

Method Detail

createKey

public Text createKey()

Description copied from interface: RecordReader

Create an object of the appropriate type to be used as a key.

Specified by:

createKey in interface RecordReader<Text,Text>

Returns:

a new key object.

createValue

public Text createValue()

Description copied from interface: RecordReader

Create an object of the appropriate type to be used as a value.

Specified by:

createValue in interface RecordReader<Text,Text>

Returns:

a new value object.

next

public boolean next(Text key,
           Text value)
             throws IOException

Read key/value pair in a line.

Specified by:

next in interface RecordReader<Text,Text>

Parameters:

key - the key to read data into

value - the value to read data into

Returns:

true iff a key/value was read, false if at EOF

Throws:

IOException

getProgress

public float getProgress()
                  throws IOException

Description copied from interface: RecordReader

How much of the input has the RecordReader consumed i.e. has been processed by?

Specified by:

getProgress in interface RecordReader<Text,Text>

Returns:

progress from 0.0 to 1.0.

Throws:

IOException

getPos

public long getPos()
            throws IOException

Description copied from interface: RecordReader

Returns the current position in the input.

Specified by:

getPos in interface RecordReader<Text,Text>

Returns:

the current position in the input.

Throws:

IOException

close

public void close()
           throws IOException

Description copied from interface: RecordReader

Close this InputSplit to future operations.

Specified by:

close in interface RecordReader<Text,Text>

Throws:

IOException