org.apache.hadoop.streaming

Class PipeMapper

java.lang.Object

org.apache.hadoop.streaming.PipeMapRed

org.apache.hadoop.streaming.PipeMapper

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Mapper

public class PipeMapper
extends PipeMapRed
implements org.apache.hadoop.mapred.Mapper

A generic Mapper bridge. It delegates operations to an external program via stdin and stdout.

Field Summary

Fields inherited from class org.apache.hadoop.streaming.PipeMapRed

LOG, outerrThreadsThrowable

Constructor Summary

Constructors

Constructor and Description
PipeMapper()

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
void	configure(org.apache.hadoop.mapred.JobConf job)
byte[]	getFieldSeparator() Returns the field separator to be used.
byte[]	getInputSeparator() Returns the input separator to be used.
int	getNumOfKeyFields() Returns the number of key fields.
void	map(Object key, Object value, org.apache.hadoop.mapred.OutputCollector output, org.apache.hadoop.mapred.Reporter reporter)

Methods inherited from class org.apache.hadoop.streaming.PipeMapRed

getClientInput, getClientOutput, getConfiguration, getContext, mapRedFinished

Methods inherited from class java.lang.Object

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

Constructor Detail

PipeMapper

public PipeMapper()

Method Detail

configure

public void configure(org.apache.hadoop.mapred.JobConf job)

Specified by:

configure in interface org.apache.hadoop.mapred.JobConfigurable

Overrides:

configure in class PipeMapRed

map

public void map(Object key,
       Object value,
       org.apache.hadoop.mapred.OutputCollector output,
       org.apache.hadoop.mapred.Reporter reporter)
         throws IOException

Specified by:

map in interface org.apache.hadoop.mapred.Mapper

Throws:

IOException

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

getInputSeparator

public byte[] getInputSeparator()

Description copied from class: PipeMapRed

Returns the input separator to be used.

Specified by:

getInputSeparator in class PipeMapRed

getFieldSeparator

public byte[] getFieldSeparator()

Description copied from class: PipeMapRed

Returns the field separator to be used.

Specified by:

getFieldSeparator in class PipeMapRed

getNumOfKeyFields

public int getNumOfKeyFields()

Description copied from class: PipeMapRed

Returns the number of key fields.

Specified by:

getNumOfKeyFields in class PipeMapRed