@InterfaceAudience.Public @InterfaceStability.Stable public interface MapRunnable<K1,V1,K2,V2> extends JobConfigurable
Mappers.
 
 Custom implementations of MapRunnable can exert greater 
 control on map processing e.g. multi-threaded, asynchronous mappers etc.
Mapper| 修飾子とタイプ | メソッドと説明 | 
|---|---|
| void | run(RecordReader<K1,V1> input,
   OutputCollector<K2,V2> output,
   Reporter reporter)Start mapping input <key, value> pairs. | 
configurevoid run(RecordReader<K1,V1> input, OutputCollector<K2,V2> output, Reporter reporter) throws IOException
Mapping of input records to output records is complete when this method returns.
input - the RecordReader to read the input records.output - the OutputCollector to collect the outputrecords.reporter - Reporter to report progress, status-updates etc.IOExceptionCopyright © 2016 Apache Software Foundation. All rights reserved.