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public interface MapRunnable<K1,V1,K2,V2>
Expert: Generic interface for Mappers.
Custom implementations of MapRunnable can exert greater
control on map processing e.g. multi-threaded, asynchronous mappers etc.
Mapper| Method Summary | |
|---|---|
void |
run(RecordReader<K1,V1> input,
OutputCollector<K2,V2> output,
Reporter reporter)
Start mapping input <key, value> pairs. |
| Methods inherited from interface org.apache.hadoop.mapred.JobConfigurable |
|---|
configure |
| Method Detail |
|---|
void 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.
IOException
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