org.apache.hadoop.mapred

类 SequenceFileOutputFormat<K,V>

java.lang.Object

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

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

所有已实现的接口:

OutputFormat<K,V>

直接已知子类:

SequenceFileAsBinaryOutputFormat

public class SequenceFileOutputFormat<K,V>
extends FileOutputFormat<K,V>

An OutputFormat that writes SequenceFiles.

嵌套类概要

从类继承的嵌套类/接口 org.apache.hadoop.mapred.FileOutputFormat

FileOutputFormat.Counter

构造器概要

构造器

构造器和说明
SequenceFileOutputFormat()

方法概要

方法

限定符和类型	方法和说明
static SequenceFile.CompressionType	getOutputCompressionType(JobConf conf) Get the SequenceFile.CompressionType for the output SequenceFile.
static SequenceFile.Reader[]	getReaders(Configuration conf, Path dir) Open the output generated by this format.
RecordWriter<K,V>	getRecordWriter(FileSystem ignored, JobConf job, String name, Progressable progress) Get the RecordWriter for the given job.
static void	setOutputCompressionType(JobConf conf, SequenceFile.CompressionType style) Set the SequenceFile.CompressionType for the output SequenceFile.

从类继承的方法 org.apache.hadoop.mapred.FileOutputFormat

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

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

SequenceFileOutputFormat

public SequenceFileOutputFormat()

方法详细资料

getRecordWriter

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

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>

指定者:

getRecordWriter 在类中 FileOutputFormat<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.

抛出:

IOException

getReaders

public static SequenceFile.Reader[] getReaders(Configuration conf,
                               Path dir)
                                        throws IOException

Open the output generated by this format.

抛出:

IOException

getOutputCompressionType

public static SequenceFile.CompressionType getOutputCompressionType(JobConf conf)

Get the SequenceFile.CompressionType for the output SequenceFile.

参数:

conf - the JobConf

返回:

the SequenceFile.CompressionType for the output SequenceFile, defaulting to SequenceFile.CompressionType.RECORD

setOutputCompressionType

public static void setOutputCompressionType(JobConf conf,
                            SequenceFile.CompressionType style)

Set the SequenceFile.CompressionType for the output SequenceFile.

参数:

conf - the JobConf to modify

style - the SequenceFile.CompressionType for the output SequenceFile