org.apache.hadoop.mapred
Class MapRunner<K1,V1,K2,V2>
java.lang.Object
org.apache.hadoop.mapred.MapRunner<K1,V1,K2,V2>
- All Implemented Interfaces:
- JobConfigurable, MapRunnable<K1,V1,K2,V2>
- Direct Known Subclasses:
- PipeMapRunner
public class MapRunner<K1,V1,K2,V2>
- extends Object
- implements MapRunnable<K1,V1,K2,V2>
Default MapRunnable
implementation.
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
MapRunner
public MapRunner()
configure
public void configure(JobConf job)
- Description copied from interface:
JobConfigurable
- Initializes a new instance from a
JobConf
.
- Specified by:
configure
in interface JobConfigurable
- Parameters:
job
- the configuration
run
public void run(RecordReader<K1,V1> input,
OutputCollector<K2,V2> output,
Reporter reporter)
throws IOException
- Description copied from interface:
MapRunnable
- Start mapping input <key, value> pairs.
Mapping of input records to output records is complete when this method
returns.
- Specified by:
run
in interface MapRunnable<K1,V1,K2,V2>
- Parameters:
input
- the RecordReader
to read the input records.output
- the OutputCollector
to collect the outputrecords.reporter
- Reporter
to report progress, status-updates etc.
- Throws:
IOException
getMapper
protected Mapper<K1,V1,K2,V2> getMapper()
Copyright © 2009 The Apache Software Foundation