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Uses of Reducer in org.apache.hadoop.mapred |
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Methods in org.apache.hadoop.mapred with parameters of type Reducer | ||
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protected static
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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)
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Uses of Reducer in org.apache.hadoop.mapreduce |
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Methods in org.apache.hadoop.mapreduce that return types with arguments of type Reducer | |
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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 | |
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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.aggregate |
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Subclasses of Reducer in org.apache.hadoop.mapreduce.lib.aggregate | |
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class |
ValueAggregatorCombiner<K1 extends WritableComparable<?>,V1 extends Writable>
This class implements the generic combiner 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.mapreduce.lib.chain |
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Subclasses of Reducer in org.apache.hadoop.mapreduce.lib.chain | |
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class |
ChainReducer<KEYIN,VALUEIN,KEYOUT,VALUEOUT>
The ChainReducer class allows to chain multiple Mapper classes after a Reducer within the Reducer task. |
Method parameters in org.apache.hadoop.mapreduce.lib.chain with type arguments of type Reducer | |
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static void |
ChainReducer.setReducer(Job job,
Class<? extends Reducer> klass,
Class<?> inputKeyClass,
Class<?> inputValueClass,
Class<?> outputKeyClass,
Class<?> outputValueClass,
org.apache.hadoop.conf.Configuration reducerConf)
Sets the Reducer class to the chain job. |
protected static void |
Chain.setReducer(Job job,
Class<? extends Reducer> klass,
Class<?> inputKeyClass,
Class<?> inputValueClass,
Class<?> outputKeyClass,
Class<?> outputValueClass,
org.apache.hadoop.conf.Configuration reducerConf)
Sets the Reducer class to the chain job. |
Uses of Reducer in org.apache.hadoop.mapreduce.lib.fieldsel |
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Subclasses of Reducer in org.apache.hadoop.mapreduce.lib.fieldsel | |
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class |
FieldSelectionReducer<K,V>
This class implements a reducer class that can be used to perform field selections in a manner similar to unix cut. |
Uses of Reducer in org.apache.hadoop.mapreduce.lib.map |
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Methods in org.apache.hadoop.mapreduce.lib.map that return types with arguments of type Reducer | |
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Class<? extends Reducer<?,?,?,?>> |
WrappedMapper.Context.getCombinerClass()
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Class<? extends Reducer<?,?,?,?>> |
WrappedMapper.Context.getReducerClass()
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Uses of Reducer in org.apache.hadoop.mapreduce.lib.reduce |
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Subclasses of Reducer in org.apache.hadoop.mapreduce.lib.reduce | |
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class |
IntSumReducer<Key>
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class |
LongSumReducer<KEY>
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class |
WrappedReducer<KEYIN,VALUEIN,KEYOUT,VALUEOUT>
A Reducer which wraps a given one to allow for custom
WrappedReducer.Context implementations. |
Methods in org.apache.hadoop.mapreduce.lib.reduce that return types with arguments of type Reducer | |
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Class<? extends Reducer<?,?,?,?>> |
WrappedReducer.Context.getCombinerClass()
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Class<? extends Reducer<?,?,?,?>> |
WrappedReducer.Context.getReducerClass()
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Uses of Reducer in org.apache.hadoop.mapreduce.task |
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Methods in org.apache.hadoop.mapreduce.task that return types with arguments of type Reducer | |
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Class<? extends Reducer<?,?,?,?>> |
JobContextImpl.getCombinerClass()
Get the combiner class for the job. |
Class<? extends Reducer<?,?,?,?>> |
JobContextImpl.getReducerClass()
Get the Reducer class for the job. |
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