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

java.lang.Object
  extended by org.apache.hadoop.conf.Configured
      extended by org.apache.avro.mapred.AvroReducer<K,V,OUT>
All Implemented Interfaces:
Closeable, Configurable, JobConfigurable

public class AvroReducer<K,V,OUT>
extends Configured
implements JobConfigurable, Closeable

A reducer for Avro data.

Applications should subclass this class and pass their subclass to AvroJob.setReducerClass(JobConf, Class) and perhaps AvroJob.setCombinerClass(JobConf, Class). Subclasses override reduce(Object, Iterable, AvroCollector, Reporter).


Constructor Summary
AvroReducer()
           
 
Method Summary
 void close()
          Subclasses can override this as desired.
 void configure(JobConf jobConf)
          Subclasses can override this as desired.
 void reduce(K key, Iterable<V> values, AvroCollector<OUT> collector, 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,
                   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

close

public void close()
           throws IOException
Subclasses can override this as desired.

Specified by:
close in interface Closeable
Throws:
IOException

configure

public void configure(JobConf jobConf)
Subclasses can override this as desired.

Specified by:
configure in interface JobConfigurable


Copyright © 2011 The Apache Software Foundation. All Rights Reserved.