Uses of Class org.apache.hadoop.mapreduce.Reducer (Hadoop 0.20.2+320 API)
Date: 2010-06-28

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

Packages that use Reducer
org.apache.hadoop.examples | Hadoop example code.
org.apache.hadoop.mapreduce |
org.apache.hadoop.mapreduce.lib.reduce |

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.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.reduce

Subclasses of Reducer in org.apache.hadoop.mapreduce.lib.reduce
`class` | `IntSumReducer<Key>`
`class` | `LongSumReducer<KEY>`

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