org.apache.hadoop.mapred

Class SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader

java.lang.Object

org.apache.hadoop.mapred.SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader

All Implemented Interfaces:

RecordReader<org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.BytesWritable>

Enclosing class:

SequenceFileAsBinaryInputFormat

public static class SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader
extends Object
implements RecordReader<org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.BytesWritable>

Read records from a SequenceFile as binary (raw) bytes.

Constructor Summary

Constructors

Constructor and Description
SequenceFileAsBinaryRecordReader(org.apache.hadoop.conf.Configuration conf, FileSplit split)

Method Summary

Modifier and Type	Method and Description
void	close() Close this InputSplit to future operations.
org.apache.hadoop.io.BytesWritable	createKey() Create an object of the appropriate type to be used as a key.
org.apache.hadoop.io.BytesWritable	createValue() Create an object of the appropriate type to be used as a value.
String	getKeyClassName() Retrieve the name of the key class for this SequenceFile.
long	getPos() Returns the current position in the input.
float	getProgress() Return the progress within the input split
String	getValueClassName() Retrieve the name of the value class for this SequenceFile.
boolean	next(org.apache.hadoop.io.BytesWritable key, org.apache.hadoop.io.BytesWritable val) Read raw bytes from a SequenceFile.

Methods inherited from class java.lang.Object

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

Constructor Detail

SequenceFileAsBinaryRecordReader

public SequenceFileAsBinaryRecordReader(org.apache.hadoop.conf.Configuration conf,
                                        FileSplit split)
                                 throws IOException

Throws:

IOException

Method Detail

createKey

public org.apache.hadoop.io.BytesWritable 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<org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.BytesWritable>

Returns:

a new key object.

createValue

public org.apache.hadoop.io.BytesWritable 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<org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.BytesWritable>

Returns:

a new value object.

getKeyClassName

public String getKeyClassName()

Retrieve the name of the key class for this SequenceFile.

See Also:

SequenceFile.Reader.getKeyClassName()

getValueClassName

public String getValueClassName()

Retrieve the name of the value class for this SequenceFile.

See Also:

SequenceFile.Reader.getValueClassName()

next

public boolean next(org.apache.hadoop.io.BytesWritable key,
                    org.apache.hadoop.io.BytesWritable val)
             throws IOException

Read raw bytes from a SequenceFile.

Specified by:

next in interface RecordReader<org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.BytesWritable>

Parameters:

key - the key to read data into

val - the value to read data into

Returns:

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

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<org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.BytesWritable>

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<org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.BytesWritable>

Throws:

IOException

getProgress

public float getProgress()
                  throws IOException

Return the progress within the input split

Specified by:

getProgress in interface RecordReader<org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.BytesWritable>

Returns:

0.0 to 1.0 of the input byte range

Throws:

IOException