org.apache.hadoop.mapreduce.lib.output

クラス NullOutputFormat<K,V>

java.lang.Object

org.apache.hadoop.mapreduce.OutputFormat<K,V>

org.apache.hadoop.mapreduce.lib.output.NullOutputFormat<K,V>

@InterfaceAudience.Public
 @InterfaceStability.Stable
public class NullOutputFormat<K,V>
extends OutputFormat<K,V>

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

コンストラクタのサマリー

コンストラクタ

コンストラクタと説明
NullOutputFormat()

メソッドのサマリー

修飾子とタイプ	メソッドと説明
void	checkOutputSpecs(JobContext context) Check for validity of the output-specification for the job.
OutputCommitter	getOutputCommitter(TaskAttemptContext context) Get the output committer for this output format.
RecordWriter<K,V>	getRecordWriter(TaskAttemptContext context) Get the RecordWriter for the given task.

クラスから継承されたメソッド java.lang.Object

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

コンストラクタの詳細

NullOutputFormat

public NullOutputFormat()

メソッドの詳細

getRecordWriter

public RecordWriter<K,V> getRecordWriter(TaskAttemptContext context)

クラスからコピーされた説明: OutputFormat

Get the RecordWriter for the given task.

定義:

getRecordWriter クラス内 OutputFormat<K,V>

パラメータ:

context - the information about the current task.

戻り値:

a RecordWriter to write the output for the job.

checkOutputSpecs

public void checkOutputSpecs(JobContext context)

クラスからコピーされた説明: 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.

定義:

checkOutputSpecs クラス内 OutputFormat<K,V>

パラメータ:

context - information about the job

getOutputCommitter

public OutputCommitter getOutputCommitter(TaskAttemptContext context)

クラスからコピーされた説明: OutputFormat

Get the output committer for this output format. This is responsible for ensuring the output is committed correctly.

定義:

getOutputCommitter クラス内 OutputFormat<K,V>

パラメータ:

context - the task context

戻り値:

an output committer