| 程序包 | 说明 |
|---|---|
| org.apache.hadoop.mapred |
A software framework for easily writing applications which process vast
amounts of data (multi-terabyte data-sets) parallelly on large clusters
(thousands of nodes) built of commodity hardware in a reliable, fault-tolerant
manner.
|
| org.apache.hadoop.mapreduce | |
| org.apache.hadoop.mapreduce.lib.db | |
| org.apache.hadoop.mapreduce.lib.output | |
| org.apache.hadoop.tools.distcp2.mapred |
| 限定符和类型 | 字段和说明 |
|---|---|
protected OutputFormat<?,?> |
Task.outputFormat |
| 限定符和类型 | 方法和说明 |
|---|---|
Class<? extends OutputFormat<?,?>> |
JobContext.getOutputFormatClass()
Get the
OutputFormat class for the job. |
| 限定符和类型 | 方法和说明 |
|---|---|
void |
Job.setOutputFormatClass(Class<? extends OutputFormat> cls)
Set the
OutputFormat for the job. |
| 限定符和类型 | 类和说明 |
|---|---|
class |
DBOutputFormat<K extends DBWritable,V>
A OutputFormat that sends the reduce output to a SQL table.
|
| 限定符和类型 | 类和说明 |
|---|---|
class |
FileOutputFormat<K,V>
A base class for
OutputFormats that read from FileSystems. |
class |
FilterOutputFormat<K,V>
FilterOutputFormat is a convenience class that wraps OutputFormat.
|
class |
LazyOutputFormat<K,V>
A Convenience class that creates output lazily.
|
class |
NullOutputFormat<K,V>
Consume all outputs and put them in /dev/null.
|
class |
SequenceFileAsBinaryOutputFormat
An
OutputFormat that writes keys,
values to SequenceFiles in binary(raw) format |
class |
SequenceFileOutputFormat<K,V>
An
OutputFormat that writes SequenceFiles. |
class |
TextOutputFormat<K,V>
An
OutputFormat that writes plain text files. |
| 限定符和类型 | 字段和说明 |
|---|---|
protected OutputFormat<K,V> |
FilterOutputFormat.baseOut |
| 限定符和类型 | 方法和说明 |
|---|---|
static void |
MultipleOutputs.addNamedOutput(Job job,
String namedOutput,
Class<? extends OutputFormat> outputFormatClass,
Class<?> keyClass,
Class<?> valueClass)
Adds a named output for the job.
|
static void |
LazyOutputFormat.setOutputFormatClass(Job job,
Class<? extends OutputFormat> theClass)
Set the underlying output format for LazyOutputFormat.
|
| 构造器和说明 |
|---|
FilterOutputFormat(OutputFormat<K,V> baseOut)
Create a FilterOutputFormat based on the underlying output format.
|
| 限定符和类型 | 类和说明 |
|---|---|
class |
CopyOutputFormat<K,V>
The CopyOutputFormat is the Hadoop OutputFormat used in DistCp.
|
Copyright © 2009 The Apache Software Foundation