Uses of Class

Packages that use Reducer

Uses of Reducer in org.apache.hadoop.mapreduce

Methods in org.apache.hadoop.mapreduce that return types with arguments of type Reducer
 Class<? extends Reducer<?,?,?,?>> JobContext.getCombinerClass()
          Get the combiner class for the job.
 Class<? extends Reducer<?,?,?,?>> JobContext.getReducerClass()
          Get the Reducer class for the job.

Method parameters in org.apache.hadoop.mapreduce with type arguments of type Reducer
 void Job.setCombinerClass(Class<? extends Reducer> cls)
          Set the combiner class for the job.
 void Job.setReducerClass(Class<? extends Reducer> cls)
          Set the Reducer for the job.

Uses of Reducer in org.apache.hadoop.mapreduce.lib.aggregate

Subclasses of Reducer in org.apache.hadoop.mapreduce.lib.aggregate
 class ValueAggregatorCombiner<K1 extends WritableComparable<?>,V1 extends Writable>
          This class implements the generic combiner of Aggregate.
 class ValueAggregatorReducer<K1 extends WritableComparable<?>,V1 extends Writable>
          This class implements the generic reducer of Aggregate.

Uses of Reducer in org.apache.hadoop.mapreduce.lib.chain

Subclasses of Reducer in org.apache.hadoop.mapreduce.lib.chain
          The ChainReducer class allows to chain multiple Mapper classes after a Reducer within the Reducer task.

Method parameters in org.apache.hadoop.mapreduce.lib.chain with type arguments of type Reducer
static void ChainReducer.setReducer(Job job, Class<? extends Reducer> klass, Class<?> inputKeyClass, Class<?> inputValueClass, Class<?> outputKeyClass, Class<?> outputValueClass, Configuration reducerConf)
          Sets the Reducer class to the chain job.

Uses of Reducer in org.apache.hadoop.mapreduce.lib.fieldsel

Subclasses of Reducer in org.apache.hadoop.mapreduce.lib.fieldsel
 class FieldSelectionReducer<K,V>
          This class implements a reducer class that can be used to perform field selections in a manner similar to unix cut.

Uses of Reducer in org.apache.hadoop.mapreduce.lib.reduce

Subclasses of Reducer in org.apache.hadoop.mapreduce.lib.reduce
 class IntSumReducer<Key>
 class LongSumReducer<KEY>
          A Reducer which wraps a given one to allow for custom WrappedReducer.Context implementations.

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