org.apache.hadoop.mapred
Class SequenceFileAsTextRecordReader

java.lang.Object
  org.apache.hadoop.mapred.SequenceFileRecordReader
      org.apache.hadoop.mapred.SequenceFileAsTextRecordReader

All Implemented Interfaces:

RecordReader

public class SequenceFileAsTextRecordReader
extends SequenceFileRecordReader

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.

Field Summary

Fields inherited from class org.apache.hadoop.mapred.SequenceFileRecordReader

conf

Constructor Summary

SequenceFileAsTextRecordReader(Configuration conf, FileSplit split)

Method Summary

WritableComparable	createKey() Create an object of the appropriate type to be used as a key.
Writable	createValue() Create an object of the appropriate type to be used as the value.
boolean	next(Writable key, Writable value) Read key/value pair in a line.

Methods inherited from class org.apache.hadoop.mapred.SequenceFileRecordReader

close, getCurrentValue, getKeyClass, getPos, getProgress, getValueClass, next, seek

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 WritableComparable 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

Overrides:

createKey in class SequenceFileRecordReader

Returns:

a new key object

createValue

public Writable createValue()

Description copied from interface: RecordReader

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

Specified by:

createValue in interface RecordReader

Overrides:

createValue in class SequenceFileRecordReader

Returns:

a new value object

next

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

Read key/value pair in a line.

Specified by:

next in interface RecordReader

Overrides:

next in class SequenceFileRecordReader

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

See Also:

Writable.readFields(DataInput)