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

Packages that use Reducer.Context

Package	Description
org.apache.hadoop.mapred
org.apache.hadoop.mapreduce
org.apache.hadoop.mapreduce.lib.aggregate
org.apache.hadoop.mapreduce.lib.chain
org.apache.hadoop.mapreduce.lib.fieldsel
org.apache.hadoop.mapreduce.lib.reduce

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

Methods in org.apache.hadoop.mapred that return Reducer.Context

Modifier and Type

Method and Description

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, 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

Modifier and Type	Method and Description
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.aggregate

Methods in org.apache.hadoop.mapreduce.lib.aggregate with parameters of type Reducer.Context

Modifier and Type	Method and Description
void	ValueAggregatorReducer.reduce(org.apache.hadoop.io.Text key, Iterable<org.apache.hadoop.io.Text> values, Reducer.Context context)
void	ValueAggregatorCombiner.reduce(org.apache.hadoop.io.Text key, Iterable<org.apache.hadoop.io.Text> values, Reducer.Context context) Combines values for a given key.
void	ValueAggregatorReducer.setup(Reducer.Context context)

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

Methods in org.apache.hadoop.mapreduce.lib.chain with parameters of type Reducer.Context

Modifier and Type	Method and Description
void	ChainReducer.run(Reducer.Context context)
protected void	ChainReducer.setup(Reducer.Context context)

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

Methods in org.apache.hadoop.mapreduce.lib.fieldsel with parameters of type Reducer.Context

Modifier and Type	Method and Description
void	FieldSelectionReducer.reduce(org.apache.hadoop.io.Text key, Iterable<org.apache.hadoop.io.Text> values, Reducer.Context context)
void	FieldSelectionReducer.setup(Reducer.Context context)

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

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

Modifier and Type	Class and Description
class	WrappedReducer.Context

Methods in org.apache.hadoop.mapreduce.lib.reduce that return Reducer.Context

Modifier and Type	Method and Description
Reducer.Context	WrappedReducer.getReducerContext(ReduceContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT> reduceContext) A a wrapped Reducer.Context for custom implementations.

Methods in org.apache.hadoop.mapreduce.lib.reduce with parameters of type Reducer.Context

Modifier and Type	Method and Description
void	IntSumReducer.reduce(Key key, Iterable<org.apache.hadoop.io.IntWritable> values, Reducer.Context context)
void	LongSumReducer.reduce(KEY key, Iterable<org.apache.hadoop.io.LongWritable> values, Reducer.Context context)