Uses of Class org.apache.hadoop.mapreduce.Reducer.Context (Hadoop 0.20.2-CDH3B4 API)
Date: 2011-02-21

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

Packages that use Reducer.Context
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.reduce |

Uses of Reducer.Context in org.apache.hadoop.examples

Methods in org.apache.hadoop.examples with parameters of type Reducer.Context
`void` | `SecondarySort.Reduce.reduce(SecondarySort.IntPair key, Iterable<IntWritable> values, Reducer.Context context)`
`void` | `WordCount.IntSumReducer.reduce(Text key, Iterable<IntWritable> values, Reducer.Context context)`

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

Methods in org.apache.hadoop.mapred that return Reducer.Context
`protected static
`<INKEY,INVALUE,OUTKEY,OUTVALUE> Reducer.Context`
` | `Task.createReduceContext(Reducer<INKEY,INVALUE,OUTKEY,OUTVALUE> reducer, Configuration job, TaskAttemptID taskId, RawKeyValueIterator rIter, Counter inputKeyCounter, Counter inputValueCounter, RecordWriter<OUTKEY,OUTVALUE> output, OutputCommitter committer, StatusReporter reporter, RawComparator<INKEY> comparator, Class<INKEY> keyClass, Class<INVALUE> valueClass)`

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

Methods in org.apache.hadoop.mapreduce with parameters of type Reducer.Context
`protected void` | `Reducer.cleanup(Reducer.Context context)` Called once at the end of the task.
`protected void` | `Reducer.reduce(KEYIN key, Iterable<VALUEIN> values, Reducer.Context context)` This method is called once for each key.
`void` | `Reducer.run(Reducer.Context context)` Advanced application writers can use the `Reducer.run(org.apache.hadoop.mapreduce.Reducer.Context)` method to control how the reduce task works.
`protected void` | `Reducer.setup(Reducer.Context context)` Called once at the start of the task.

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

Methods in org.apache.hadoop.mapreduce.lib.reduce with parameters of type Reducer.Context
`void` | `IntSumReducer.reduce(Key key, Iterable<IntWritable> values, Reducer.Context context)`
`void` | `LongSumReducer.reduce(KEY key, Iterable<LongWritable> values, Reducer.Context context)`

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