Uses of Interface
org.apache.hadoop.mapred.Reducer

Packages that use Reducer
org.apache.hadoop.mapred   
org.apache.hadoop.mapred.lib   
org.apache.hadoop.mapred.lib.aggregate   
org.apache.hadoop.mapreduce.task.reduce   
 

Uses of Reducer in org.apache.hadoop.mapred
 

Methods in org.apache.hadoop.mapred that return types with arguments of type Reducer
 Class<? extends Reducer> JobConf.getCombinerClass()
          Get the user-defined combiner class used to combine map-outputs before being sent to the reducers.
 Class<? extends Reducer> ShuffleConsumerPlugin.Context.getCombinerClass()
           
 Class<? extends Reducer> JobConf.getReducerClass()
          Get the Reducer class for the job.
 

Method parameters in org.apache.hadoop.mapred with type arguments of type Reducer
 void JobConf.setCombinerClass(Class<? extends Reducer> theClass)
          Set the user-defined combiner class used to combine map-outputs before being sent to the reducers.
 void JobConf.setReducerClass(Class<? extends Reducer> theClass)
          Set the Reducer class for the job.
 

Constructor parameters in org.apache.hadoop.mapred with type arguments of type Reducer
ShuffleConsumerPlugin.Context(TaskAttemptID reduceId, JobConf jobConf, org.apache.hadoop.fs.FileSystem localFS, TaskUmbilicalProtocol umbilical, org.apache.hadoop.fs.LocalDirAllocator localDirAllocator, Reporter reporter, org.apache.hadoop.io.compress.CompressionCodec codec, Class<? extends Reducer> combinerClass, Task.CombineOutputCollector<K,V> combineCollector, Counters.Counter spilledRecordsCounter, Counters.Counter reduceCombineInputCounter, Counters.Counter shuffledMapsCounter, Counters.Counter reduceShuffleBytes, Counters.Counter failedShuffleCounter, Counters.Counter mergedMapOutputsCounter, TaskStatus status, org.apache.hadoop.util.Progress copyPhase, org.apache.hadoop.util.Progress mergePhase, Task reduceTask, MapOutputFile mapOutputFile)
           
Task.OldCombinerRunner(Class<? extends Reducer<K,V,K,V>> cls, JobConf conf, Counters.Counter inputCounter, Task.TaskReporter reporter)
           
 

Uses of Reducer in org.apache.hadoop.mapred.lib
 

Classes in org.apache.hadoop.mapred.lib that implement Reducer
 class ChainReducer
          The ChainReducer class allows to chain multiple Mapper classes after a Reducer within the Reducer task.
 class FieldSelectionMapReduce<K,V>
          This class implements a mapper/reducer class that can be used to perform field selections in a manner similar to unix cut.
 class IdentityReducer<K,V>
          Performs no reduction, writing all input values directly to the output.
 class LongSumReducer<K>
          A Reducer that sums long values.
 

Method parameters in org.apache.hadoop.mapred.lib with type arguments of type Reducer
static
<K1,V1,K2,V2>
void
ChainReducer.setReducer(JobConf job, Class<? extends Reducer<K1,V1,K2,V2>> klass, Class<? extends K1> inputKeyClass, Class<? extends V1> inputValueClass, Class<? extends K2> outputKeyClass, Class<? extends V2> outputValueClass, boolean byValue, JobConf reducerConf)
          Sets the Reducer class to the chain job's JobConf.
 

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

Classes in org.apache.hadoop.mapred.lib.aggregate that implement Reducer
 class ValueAggregatorCombiner<K1 extends WritableComparable,V1 extends Writable>
          This class implements the generic combiner of Aggregate.
 class ValueAggregatorJobBase<K1 extends WritableComparable,V1 extends Writable>
          This abstract class implements some common functionalities of the the generic mapper, reducer and combiner classes of Aggregate.
 class ValueAggregatorMapper<K1 extends WritableComparable,V1 extends Writable>
          This class implements the generic mapper 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.task.reduce
 

Constructor parameters in org.apache.hadoop.mapreduce.task.reduce with type arguments of type Reducer
MergeManagerImpl(TaskAttemptID reduceId, JobConf jobConf, org.apache.hadoop.fs.FileSystem localFS, org.apache.hadoop.fs.LocalDirAllocator localDirAllocator, Reporter reporter, org.apache.hadoop.io.compress.CompressionCodec codec, Class<? extends Reducer> combinerClass, Task.CombineOutputCollector<K,V> combineCollector, Counters.Counter spilledRecordsCounter, Counters.Counter reduceCombineInputCounter, Counters.Counter mergedMapOutputsCounter, ExceptionReporter exceptionReporter, org.apache.hadoop.util.Progress mergePhase, MapOutputFile mapOutputFile)
           
 



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