org.apache.hadoop.mapred

类 MapFileOutputFormat

java.lang.Object

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

org.apache.hadoop.mapred.MapFileOutputFormat

所有已实现的接口:

OutputFormat<WritableComparable,Writable>

public class MapFileOutputFormat
extends FileOutputFormat<WritableComparable,Writable>

An OutputFormat that writes MapFiles.

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
MapFileOutputFormat()

方法概要

方法

限定符和类型	方法和说明
static <K extends WritableComparable,V extends Writable> Writable	getEntry(MapFile.Reader[] readers, Partitioner<K,V> partitioner, K key, V value) Get an entry from output generated by this class.
static 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.

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

MapFileOutputFormat

public MapFileOutputFormat()

方法详细资料

getRecordWriter

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

指定者:

getRecordWriter 在类中 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.

返回:

a RecordWriter to write the output for the job.

抛出:

IOException

getReaders

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

Open the output generated by this format.

抛出:

IOException

getEntry

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

Get an entry from output generated by this class.

抛出:

IOException