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Packages that use Reducer | |
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org.apache.hadoop.contrib.index.mapred | |
org.apache.hadoop.contrib.utils.join | |
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.mapred.lib | Library of generally useful mappers, reducers, and partitioners. |
org.apache.hadoop.mapred.lib.aggregate | Classes for performing various counting and aggregations. |
org.apache.hadoop.streaming | Hadoop Streaming is a utility which allows users to create and run Map-Reduce jobs with any executables (e.g. |
Uses of Reducer in org.apache.hadoop.contrib.index.mapred |
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Classes in org.apache.hadoop.contrib.index.mapred that implement Reducer | |
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class |
IndexUpdateCombiner
This combiner combines multiple intermediate forms into one intermediate form. |
class |
IndexUpdateReducer
This reducer applies to a shard the changes for it. |
Uses of Reducer in org.apache.hadoop.contrib.utils.join |
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Classes in org.apache.hadoop.contrib.utils.join that implement Reducer | |
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class |
DataJoinMapperBase
This abstract class serves as the base class for the mapper class of a data join job. |
class |
DataJoinReducerBase
This abstract class serves as the base class for the reducer class of a data join job. |
class |
JobBase
A common base implementing some statics collecting mechanisms that are commonly used in a typical map/reduce job. |
Uses of Reducer in org.apache.hadoop.examples |
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Classes in org.apache.hadoop.examples that implement Reducer | |
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static class |
PiEstimator.PiReducer
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class |
SleepJob
Dummy class for testing MR framefork. |
static class |
WordCount.Reduce
A reducer class that just emits the sum of the input values. |
Uses of Reducer in org.apache.hadoop.mapred |
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Methods in org.apache.hadoop.mapred that return types with arguments of type Reducer | |
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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> |
JobConf.getReducerClass()
Get the Reducer class for the job. |
Method parameters in org.apache.hadoop.mapred with type arguments of type Reducer | |
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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. |
Uses of Reducer in org.apache.hadoop.mapred.lib |
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Classes in org.apache.hadoop.mapred.lib that implement Reducer | |
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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. |
Uses of Reducer in org.apache.hadoop.mapred.lib.aggregate |
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Classes in org.apache.hadoop.mapred.lib.aggregate that implement Reducer | |
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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.streaming |
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Classes in org.apache.hadoop.streaming that implement Reducer | |
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class |
PipeReducer
A generic Reducer bridge. |
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