Uses of Interface org.apache.hadoop.mapred.OutputCollector (Hadoop 0.20.2-cdh3u4 API)
Date: 2012-05-07

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## Uses of Interface
org.apache.hadoop.mapred.OutputCollector

Packages that use OutputCollector
org.apache.hadoop.contrib.index.example |
org.apache.hadoop.contrib.index.mapred |
org.apache.hadoop.contrib.utils.join |
org.apache.hadoop.examples | Hadoop example code.
org.apache.hadoop.examples.dancing | This package is a distributed implementation of Knuth's dancing links algorithm that can run under Hadoop.
org.apache.hadoop.examples.terasort | This package consists of 3 map/reduce applications for Hadoop to compete in the annual terabyte sort competition.
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 OutputCollector in org.apache.hadoop.contrib.index.example

Methods in org.apache.hadoop.contrib.index.example with parameters of type OutputCollector
`void` | `IdentityLocalAnalysis.map(DocumentID key, DocumentAndOp value, OutputCollector<DocumentID,DocumentAndOp> output, Reporter reporter)`
`void` | `LineDocLocalAnalysis.map(DocumentID key, LineDocTextAndOp value, OutputCollector<DocumentID,DocumentAndOp> output, Reporter reporter)`

Uses of OutputCollector in org.apache.hadoop.contrib.index.mapred

Methods in org.apache.hadoop.contrib.index.mapred with parameters of type OutputCollector
`void` | `IndexUpdateMapper.map(K key, V value, OutputCollector<Shard,IntermediateForm> output, Reporter reporter)` Map a key-value pair to a shard-and-intermediate form pair.
`void` | `IndexUpdateCombiner.reduce(Shard key, Iterator<IntermediateForm> values, OutputCollector<Shard,IntermediateForm> output, Reporter reporter)`
`void` | `IndexUpdateReducer.reduce(Shard key, Iterator<IntermediateForm> values, OutputCollector<Shard,Text> output, Reporter reporter)`

Uses of OutputCollector in org.apache.hadoop.contrib.utils.join

Methods in org.apache.hadoop.contrib.utils.join with parameters of type OutputCollector
`protected void` | `DataJoinReducerBase.collect(Object key, TaggedMapOutput aRecord, OutputCollector output, Reporter reporter)` The subclass can overwrite this method to perform additional filtering and/or other processing logic before a value is collected.
`void` | `DataJoinMapperBase.map(Object key, Object value, OutputCollector output, Reporter reporter)`
`void` | `DataJoinReducerBase.map(Object arg0, Object arg1, OutputCollector arg2, Reporter arg3)`
`void` | `DataJoinMapperBase.reduce(Object arg0, Iterator arg1, OutputCollector arg2, Reporter arg3)`
`void` | `DataJoinReducerBase.reduce(Object key, Iterator values, OutputCollector output, Reporter reporter)`

Uses of OutputCollector in org.apache.hadoop.examples

Methods in org.apache.hadoop.examples with parameters of type OutputCollector
`void` | `SleepJob.map(IntWritable key, IntWritable value, OutputCollector<IntWritable,NullWritable> output, Reporter reporter)`
`void` | `PiEstimator.PiMapper.map(LongWritable offset, LongWritable size, OutputCollector<BooleanWritable,LongWritable> out, Reporter reporter)` Map method.
`void` | `PiEstimator.PiReducer.reduce(BooleanWritable isInside, Iterator<LongWritable> values, OutputCollector<WritableComparable<?>,Writable> output, Reporter reporter)` Accumulate number of points inside/outside results from the mappers.
`void` | `SleepJob.reduce(IntWritable key, Iterator<NullWritable> values, OutputCollector<NullWritable,NullWritable> output, Reporter reporter)`

Uses of OutputCollector in org.apache.hadoop.examples.dancing

Methods in org.apache.hadoop.examples.dancing with parameters of type OutputCollector
`void` | `DistributedPentomino.PentMap.map(WritableComparable key, Text value, OutputCollector<Text,Text> output, Reporter reporter)` Break the prefix string into moves (a sequence of integer row ids that will be selected for each column in order).

Uses of OutputCollector in org.apache.hadoop.examples.terasort

Methods in org.apache.hadoop.examples.terasort with parameters of type OutputCollector
`void` | `TeraGen.SortGenMapper.map(LongWritable row, NullWritable ignored, OutputCollector<Text,Text> output, Reporter reporter)`

Uses of OutputCollector in org.apache.hadoop.mapred

Classes in org.apache.hadoop.mapred that implement OutputCollector
`protected static class` | `Task.CombineOutputCollector<K,V>` OutputCollector for the combiner.

Methods in org.apache.hadoop.mapred with parameters of type OutputCollector
`protected void` | `Task.OldCombinerRunner.combine(RawKeyValueIterator kvIter, OutputCollector<K,V> combineCollector)`
`void` | `Mapper.map(K1 key, V1 value, OutputCollector<K2,V2> output, Reporter reporter)` Maps a single input key/value pair into an intermediate key/value pair.
`void` | `Reducer.reduce(K2 key, Iterator<V2> values, OutputCollector<K3,V3> output, Reporter reporter)` Reduces values for a given key.
`void` | `MapRunnable.run(RecordReader<K1,V1> input, OutputCollector<K2,V2> output, Reporter reporter)` Start mapping input `<key, value>` pairs.
`void` | `MapRunner.run(RecordReader<K1,V1> input, OutputCollector<K2,V2> output, Reporter reporter)`

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

Methods in org.apache.hadoop.mapred.lib that return OutputCollector
`OutputCollector` | `MultipleOutputs.getCollector(String namedOutput, Reporter reporter)` Gets the output collector for a named output.
`OutputCollector` | `MultipleOutputs.getCollector(String namedOutput, String multiName, Reporter reporter)` Gets the output collector for a multi named output.

Methods in org.apache.hadoop.mapred.lib with parameters of type OutputCollector
`void` | `DelegatingMapper.map(K1 key, V1 value, OutputCollector<K2,V2> outputCollector, Reporter reporter)`
`void` | `TokenCountMapper.map(K key, Text value, OutputCollector<Text,LongWritable> output, Reporter reporter)`
`void` | `RegexMapper.map(K key, Text value, OutputCollector<Text,LongWritable> output, Reporter reporter)`
`void` | `IdentityMapper.map(K key, V val, OutputCollector<K,V> output, Reporter reporter)` The identify function.
`void` | `FieldSelectionMapReduce.map(K key, V val, OutputCollector<Text,Text> output, Reporter reporter)` The identify function.
`void` | `InverseMapper.map(K key, V value, OutputCollector<V,K> output, Reporter reporter)` The inverse function.
`void` | `ChainMapper.map(Object key, Object value, OutputCollector output, Reporter reporter)` Chains the `map(...)` methods of the Mappers in the chain.
`void` | `LongSumReducer.reduce(K key, Iterator<LongWritable> values, OutputCollector<K,LongWritable> output, Reporter reporter)`
`void` | `IdentityReducer.reduce(K key, Iterator<V> values, OutputCollector<K,V> output, Reporter reporter)` Writes all keys and values directly to output.
`void` | `ChainReducer.reduce(Object key, Iterator values, OutputCollector output, Reporter reporter)` Chains the `reduce(...)` method of the Reducer with the `map(...)` methods of the Mappers in the chain.
`void` | `FieldSelectionMapReduce.reduce(Text key, Iterator<Text> values, OutputCollector<Text,Text> output, Reporter reporter)`
`void` | `MultithreadedMapRunner.run(RecordReader<K1,V1> input, OutputCollector<K2,V2> output, Reporter reporter)`

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

Methods in org.apache.hadoop.mapred.lib.aggregate with parameters of type OutputCollector
`void` | `ValueAggregatorMapper.map(K1 key, V1 value, OutputCollector<Text,Text> output, Reporter reporter)` the map function.
`void` | `ValueAggregatorReducer.map(K1 arg0, V1 arg1, OutputCollector<Text,Text> arg2, Reporter arg3)` Do nothing.
`void` | `ValueAggregatorCombiner.map(K1 arg0, V1 arg1, OutputCollector<Text,Text> arg2, Reporter arg3)` Do nothing.
`void` | `ValueAggregatorMapper.reduce(Text arg0, Iterator<Text> arg1, OutputCollector<Text,Text> arg2, Reporter arg3)` Do nothing.
`void` | `ValueAggregatorReducer.reduce(Text key, Iterator<Text> values, OutputCollector<Text,Text> output, Reporter reporter)`
`void` | `ValueAggregatorCombiner.reduce(Text key, Iterator<Text> values, OutputCollector<Text,Text> output, Reporter reporter)` Combines values for a given key.

Uses of OutputCollector in org.apache.hadoop.streaming

Methods in org.apache.hadoop.streaming with parameters of type OutputCollector
`void` | `PipeMapper.map(Object key, Object value, OutputCollector output, Reporter reporter)`
`void` | `PipeReducer.reduce(Object key, Iterator values, OutputCollector output, Reporter reporter)`
`void` | `PipeMapRunner.run(RecordReader<K1,V1> input, OutputCollector<K2,V2> output, Reporter reporter)`

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