org.apache.hadoop.mapred

Class MapFileOutputFormat

java.lang.Object

org.apache.hadoop.mapred.FileOutputFormat<WritableComparable,Writable>

org.apache.hadoop.mapred.MapFileOutputFormat

All Implemented Interfaces:

OutputFormat<WritableComparable,Writable>

@InterfaceAudience.Public
@InterfaceStability.Stable
public class MapFileOutputFormat
extends FileOutputFormat<WritableComparable,Writable>

An OutputFormat that writes MapFiles.

Constructor Summary

Constructors

Constructor and Description
MapFileOutputFormat()

Method Summary

Methods

Modifier and Type	Method and Description
static <K extends WritableComparable,V extends Writable> Writable	getEntry(org.apache.hadoop.io.MapFile.Reader[] readers, Partitioner<K,V> partitioner, K key, V value) Get an entry from output generated by this class.
static org.apache.hadoop.io.MapFile.Reader[]	getReaders(FileSystem ignored, Path dir, Configuration conf) Open the output generated by this format.
RecordWriter<WritableComparable,Writable>	getRecordWriter(FileSystem ignored, JobConf job, String name, Progressable progress) Get the RecordWriter for the given job.

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

MapFileOutputFormat

public MapFileOutputFormat()

Method Detail

getRecordWriter

public RecordWriter<WritableComparable,Writable> 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<WritableComparable,Writable>

Specified by:

getRecordWriter in class FileOutputFormat<WritableComparable,Writable>

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 org.apache.hadoop.io.MapFile.Reader[] getReaders(FileSystem ignored,
                                               Path dir,
                                               Configuration conf)
                                                        throws IOException

Open the output generated by this format.

Throws:

IOException

getEntry

public static <K extends WritableComparable,V extends Writable> Writable getEntry(org.apache.hadoop.io.MapFile.Reader[] readers,
                                                                  Partitioner<K,V> partitioner,
                                                                  K key,
                                                                  V value)
                         throws IOException

Get an entry from output generated by this class.

Throws:

IOException