org.apache.hadoop.mapred

クラス SequenceFileAsBinaryOutputFormat

java.lang.Object

org.apache.hadoop.mapred.FileOutputFormat<K,V>

org.apache.hadoop.mapred.SequenceFileOutputFormat<BytesWritable,BytesWritable>

org.apache.hadoop.mapred.SequenceFileAsBinaryOutputFormat

すべての実装されたインタフェース:

OutputFormat<BytesWritable,BytesWritable>

@InterfaceAudience.Public
 @InterfaceStability.Stable
public class SequenceFileAsBinaryOutputFormat
extends SequenceFileOutputFormat<BytesWritable,BytesWritable>

An OutputFormat that writes keys, values to SequenceFiles in binary(raw) format

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
SequenceFileAsBinaryOutputFormat()

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(FileSystem ignored, JobConf job) Check for validity of the output-specification for the job.
RecordWriter<BytesWritable,BytesWritable>	getRecordWriter(FileSystem ignored, JobConf job, String name, Progressable progress) Get the RecordWriter for the given job.
static Class<? extends WritableComparable>	getSequenceFileOutputKeyClass(JobConf conf) Get the key class for the SequenceFile
static Class<? extends Writable>	getSequenceFileOutputValueClass(JobConf conf) Get the value class for the SequenceFile
static void	setSequenceFileOutputKeyClass(JobConf conf, Class<?> theClass) Set the key class for the SequenceFile This allows the user to specify the key class to be different from the actual class (BytesWritable) used for writing
static void	setSequenceFileOutputValueClass(JobConf conf, Class<?> theClass) Set the value class for the SequenceFile This allows the user to specify the value class to be different from the actual class (BytesWritable) used for writing

クラスから継承されたメソッド org.apache.hadoop.mapred.SequenceFileOutputFormat

getOutputCompressionType, getReaders, setOutputCompressionType

クラスから継承されたメソッド org.apache.hadoop.mapred.FileOutputFormat

getCompressOutput, getOutputCompressorClass, getOutputPath, getPathForCustomFile, getTaskOutputPath, getUniqueName, getWorkOutputPath, setCompressOutput, setOutputCompressorClass, setOutputPath

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

SequenceFileAsBinaryOutputFormat

public SequenceFileAsBinaryOutputFormat()

メソッドの詳細

setSequenceFileOutputKeyClass

public static void setSequenceFileOutputKeyClass(JobConf conf,
                                                 Class<?> theClass)

Set the key class for the SequenceFile

This allows the user to specify the key class to be different from the actual class (BytesWritable) used for writing

パラメータ:

conf - the JobConf to modify

theClass - the SequenceFile output key class.

setSequenceFileOutputValueClass

public static void setSequenceFileOutputValueClass(JobConf conf,
                                                   Class<?> theClass)

Set the value class for the SequenceFile

This allows the user to specify the value class to be different from the actual class (BytesWritable) used for writing

パラメータ:

conf - the JobConf to modify

theClass - the SequenceFile output key class.

getSequenceFileOutputKeyClass

public static Class<? extends WritableComparable> getSequenceFileOutputKeyClass(JobConf conf)

Get the key class for the SequenceFile

戻り値:

the key class of the SequenceFile

getSequenceFileOutputValueClass

public static Class<? extends Writable> getSequenceFileOutputValueClass(JobConf conf)

Get the value class for the SequenceFile

戻り値:

the value class of the SequenceFile

getRecordWriter

public RecordWriter<BytesWritable,BytesWritable> getRecordWriter(FileSystem ignored,
                                                                 JobConf job,
                                                                 String name,
                                                                 Progressable progress)
                                                          throws IOException

インタフェースからコピーされた説明: OutputFormat

Get the RecordWriter for the given job.

定義:

getRecordWriter インタフェース内 OutputFormat<BytesWritable,BytesWritable>

オーバーライド:

getRecordWriter クラス内 SequenceFileOutputFormat<BytesWritable,BytesWritable>

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.

戻り値:

a RecordWriter to write the output for the job.

例外:

IOException

checkOutputSpecs

public void checkOutputSpecs(FileSystem ignored,
                             JobConf job)
                      throws IOException

インタフェー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 インタフェース内 OutputFormat<BytesWritable,BytesWritable>

オーバーライド:

checkOutputSpecs クラス内 FileOutputFormat<BytesWritable,BytesWritable>

job - job configuration.

例外:

IOException - when output should not be attempted