org.apache.hadoop.mapreduce.lib.output

Class MapFileOutputFormat

java.lang.Object

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

org.apache.hadoop.mapreduce.lib.output.FileOutputFormat<WritableComparable<?>,Writable>

org.apache.hadoop.mapreduce.lib.output.MapFileOutputFormat

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

An OutputFormat that writes MapFiles.

Field Summary

Fields inherited from class org.apache.hadoop.mapreduce.lib.output.FileOutputFormat

BASE_OUTPUT_NAME, COMPRESS, COMPRESS_CODEC, COMPRESS_TYPE, OUTDIR, PART

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(Path dir, Configuration conf) Open the output generated by this format.
RecordWriter<WritableComparable<?>,Writable>	getRecordWriter(TaskAttemptContext context) Get the RecordWriter for the given task.

Methods inherited from class org.apache.hadoop.mapreduce.lib.output.FileOutputFormat

checkOutputSpecs, getCompressOutput, getDefaultWorkFile, getOutputCommitter, getOutputCompressorClass, getOutputName, getOutputPath, getPathForWorkFile, getUniqueFile, getWorkOutputPath, setCompressOutput, setOutputCompressorClass, setOutputName, 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(TaskAttemptContext context)
                                                             throws IOException

Description copied from class: OutputFormat

Get the RecordWriter for the given task.

Specified by:

getRecordWriter in class FileOutputFormat<WritableComparable<?>,Writable>

Parameters:

context - the information about the current task.

Returns:

a RecordWriter to write the output for the job.

Throws:

IOException

getReaders

public static org.apache.hadoop.io.MapFile.Reader[] getReaders(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