org.apache.avro.mapred
Class AvroReducer<K,V,OUT>

java.lang.Object
  org.apache.hadoop.conf.Configured
      org.apache.avro.mapred.AvroReducer<K,V,OUT>

All Implemented Interfaces:

Configurable

public class AvroReducer<K,V,OUT>
extends Configured

A reducer for Avro data.

Applications should subclass this class and pass their subclass to AvroJob.setReducerClass(org.apache.hadoop.mapred.JobConf, java.lang.Class) and perhaps AvroJob.setCombinerClass(org.apache.hadoop.mapred.JobConf, java.lang.Class). Subclasses override reduce(K, java.lang.Iterable, org.apache.avro.mapred.AvroCollector, org.apache.hadoop.mapred.Reporter).

Constructor Summary

AvroReducer()

Method Summary

void	reduce(K key, Iterable<V> values, AvroCollector<OUT> collector, org.apache.hadoop.mapred.Reporter reporter) Called with all map output values with a given key.

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AvroReducer

public AvroReducer()

Method Detail

reduce

public void reduce(K key,
                   Iterable<V> values,
                   AvroCollector<OUT> collector,
                   org.apache.hadoop.mapred.Reporter reporter)
            throws IOException

Called with all map output values with a given key. By default, pairs key with each value, collecting Pair instances.

Throws:

IOException