org.apache.hadoop.mapred.lib

类 NullOutputFormat<K,V>

java.lang.Object

org.apache.hadoop.mapred.lib.NullOutputFormat<K,V>

所有已实现的接口:

OutputFormat<K,V>

public class NullOutputFormat<K,V>
extends Object
implements OutputFormat<K,V>

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

构造器概要

构造器

构造器和说明
NullOutputFormat()

方法概要

方法

限定符和类型	方法和说明
void	checkOutputSpecs(FileSystem ignored, JobConf job) Check for validity of the output-specification for the job.
RecordWriter<K,V>	getRecordWriter(FileSystem ignored, JobConf job, String name, Progressable progress) Get the RecordWriter for the given job.

从类继承的方法 java.lang.Object

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

构造器详细资料

NullOutputFormat

public NullOutputFormat()

方法详细资料

getRecordWriter

public RecordWriter<K,V> getRecordWriter(FileSystem ignored,
                                JobConf job,
                                String name,
                                Progressable progress)

从接口复制的说明: OutputFormat

Get the RecordWriter for the given job.

指定者:

getRecordWriter 在接口中 OutputFormat<K,V>

job - configuration for 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.

返回:

a RecordWriter to write the output for the job.

checkOutputSpecs

public void checkOutputSpecs(FileSystem ignored,
                    JobConf job)

从接口复制的说明: OutputFormat

Check for validity of the output-specification for the job.

This is to validate the output specification for the job when it is 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.

指定者:

checkOutputSpecs 在接口中 OutputFormat<K,V>

job - job configuration.