org.apache.hadoop.mapred.lib
Class NullOutputFormat

java.lang.Object
  org.apache.hadoop.mapred.lib.NullOutputFormat

All Implemented Interfaces:

OutputFormat

public class NullOutputFormat
extends Object
implements OutputFormat

Consume all outputs and put them in /dev/null.

Constructor Summary

NullOutputFormat()

Method Summary

void	checkOutputSpecs(FileSystem ignored, JobConf job) Check whether the output specification for a job is appropriate.
RecordWriter	getRecordWriter(FileSystem ignored, JobConf job, String name, Progressable progress) Construct a RecordWriter with Progressable.

Methods inherited from class java.lang.Object

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

Constructor Detail

NullOutputFormat

public NullOutputFormat()

Method Detail

getRecordWriter

public RecordWriter getRecordWriter(FileSystem ignored,
                                    JobConf job,
                                    String name,
                                    Progressable progress)

Description copied from interface: OutputFormat

Construct a RecordWriter with Progressable.

Specified by:

getRecordWriter in interface OutputFormat

job - the job whose output is being written

name - the unique name for this part of the output

progress - mechanism for reporting progress while writing to file

Returns:

a RecordWriter

checkOutputSpecs

public void checkOutputSpecs(FileSystem ignored,
                             JobConf job)

Description copied from interface: OutputFormat

Check whether the output specification for a job is appropriate. Called when a job is submitted. Typically checks that it does not already exist, throwing an exception when it already exists, so that output is not overwritten.

Specified by:

checkOutputSpecs in interface OutputFormat

job - the job whose output will be written