org.apache.hadoop.mapred

类 MapRunner<K1,V1,K2,V2>

java.lang.Object

org.apache.hadoop.mapred.MapRunner<K1,V1,K2,V2>

所有已实现的接口:

JobConfigurable, MapRunnable<K1,V1,K2,V2>

直接已知子类:

PipeMapRunner

public class MapRunner<K1,V1,K2,V2>
extends Object
implements MapRunnable<K1,V1,K2,V2>

Default MapRunnable implementation.

构造器概要

构造器

构造器和说明
MapRunner()

方法概要

方法

限定符和类型	方法和说明
void	configure(JobConf job) Initializes a new instance from a JobConf.
protected Mapper<K1,V1,K2,V2>	getMapper()
void	run(RecordReader<K1,V1> input, OutputCollector<K2,V2> output, Reporter reporter) Start mapping input <key, value> pairs.

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

MapRunner

public MapRunner()

方法详细资料

configure

public void configure(JobConf job)

从接口复制的说明: JobConfigurable

Initializes a new instance from a JobConf.

指定者:

configure 在接口中 JobConfigurable

参数:

job - the configuration

run

public void run(RecordReader<K1,V1> input,
       OutputCollector<K2,V2> output,
       Reporter reporter)
         throws IOException

从接口复制的说明: MapRunnable

Start mapping input <key, value> pairs.

Mapping of input records to output records is complete when this method returns.

指定者:

run 在接口中 MapRunnable<K1,V1,K2,V2>

参数:

input - the RecordReader to read the input records.

output - the OutputCollector to collect the outputrecords.

reporter - Reporter to report progress, status-updates etc.

抛出:

IOException

getMapper

protected Mapper<K1,V1,K2,V2> getMapper()