Uses of Class
org.apache.hadoop.mapreduce.Reducer

Packages that use Reducer
org.apache.hadoop.examples Hadoop example code. 
org.apache.hadoop.mapred A software framework for easily writing applications which process vast amounts of data (multi-terabyte data-sets) parallelly on large clusters (thousands of nodes) built of commodity hardware in a reliable, fault-tolerant manner. 
org.apache.hadoop.mapreduce   
org.apache.hadoop.mapreduce.lib.fieldsel   
org.apache.hadoop.mapreduce.lib.map   
org.apache.hadoop.mapreduce.lib.reduce   
org.apache.hadoop.mapreduce.task   
 

Uses of Reducer in org.apache.hadoop.examples
 

Subclasses of Reducer in org.apache.hadoop.examples
static class SecondarySort.Reduce
          A reducer class that just emits the sum of the input values.
static class WordCount.IntSumReducer
           
 

Uses of Reducer in org.apache.hadoop.mapred
 

Methods in org.apache.hadoop.mapred with parameters of type Reducer
protected static
<INKEY,INVALUE,OUTKEY,OUTVALUE>
Reducer.Context
Task.createReduceContext(Reducer<INKEY,INVALUE,OUTKEY,OUTVALUE> reducer, org.apache.hadoop.conf.Configuration job, TaskAttemptID taskId, RawKeyValueIterator rIter, Counter inputKeyCounter, Counter inputValueCounter, RecordWriter<OUTKEY,OUTVALUE> output, OutputCommitter committer, StatusReporter reporter, org.apache.hadoop.io.RawComparator<INKEY> comparator, java.lang.Class<INKEY> keyClass, java.lang.Class<INVALUE> valueClass)
           
 

Uses of Reducer in org.apache.hadoop.mapreduce
 

Methods in org.apache.hadoop.mapreduce that return types with arguments of type Reducer
 java.lang.Class<? extends Reducer<?,?,?,?>> JobContext.getCombinerClass()
          Get the combiner class for the job.
 java.lang.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(java.lang.Class<? extends Reducer> cls)
          Set the combiner class for the job.
 void Job.setReducerClass(java.lang.Class<? extends Reducer> cls)
          Set the Reducer for the 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.map
 

Methods in org.apache.hadoop.mapreduce.lib.map that return types with arguments of type Reducer
 java.lang.Class<? extends Reducer<?,?,?,?>> WrappedMapper.Context.getCombinerClass()
           
 java.lang.Class<? extends Reducer<?,?,?,?>> WrappedMapper.Context.getReducerClass()
           
 

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>
           
 class WrappedReducer<KEYIN,VALUEIN,KEYOUT,VALUEOUT>
          A Reducer which wraps a given one to allow for custom WrappedReducer.Context implementations.
 

Methods in org.apache.hadoop.mapreduce.lib.reduce that return types with arguments of type Reducer
 java.lang.Class<? extends Reducer<?,?,?,?>> WrappedReducer.Context.getCombinerClass()
           
 java.lang.Class<? extends Reducer<?,?,?,?>> WrappedReducer.Context.getReducerClass()
           
 

Uses of Reducer in org.apache.hadoop.mapreduce.task
 

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



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