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

java.lang.Object
  org.apache.hadoop.mapred.FileOutputFormat<K,V>
      org.apache.hadoop.mapred.SequenceFileOutputFormat<K,V>

All Implemented Interfaces:

OutputFormat<K,V>

Direct Known Subclasses:

SequenceFileAsBinaryOutputFormat

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

An OutputFormat that writes SequenceFiles.

Constructor Summary

SequenceFileOutputFormat()

Method Summary

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.

Methods inherited from class org.apache.hadoop.mapred.FileOutputFormat

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

Methods inherited from class java.lang.Object

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

Constructor Detail

SequenceFileOutputFormat

public SequenceFileOutputFormat()

Method Detail

getRecordWriter

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

Description copied from interface: OutputFormat

Get the RecordWriter for the given job.

Specified by:

getRecordWriter in interface OutputFormat<K,V>

Specified by:

getRecordWriter in class 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.

Returns:

a RecordWriter to write the output for the job.

Throws:

IOException

getReaders

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

Open the output generated by this format.

Throws:

IOException

getOutputCompressionType

public static SequenceFile.CompressionType getOutputCompressionType(JobConf conf)

Get the SequenceFile.CompressionType for the output SequenceFile.

Parameters:

conf - the JobConf

Returns:

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.

Parameters:

conf - the JobConf to modify

style - the SequenceFile.CompressionType for the output SequenceFile