Uses of Class
org.apache.hadoop.mapreduce.Mapper
Packages that use Mapper
Package
Description
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Uses of Mapper in org.apache.hadoop.mapreduce
Methods in org.apache.hadoop.mapreduce that return types with arguments of type MapperMethod parameters in org.apache.hadoop.mapreduce with type arguments of type MapperModifier and TypeMethodDescriptionvoidJob.setMapperClass(Class<? extends Mapper> cls) Set theMapperfor the job. -
Uses of Mapper in org.apache.hadoop.mapreduce.lib.aggregate
Subclasses of Mapper in org.apache.hadoop.mapreduce.lib.aggregateModifier and TypeClassDescriptionclassValueAggregatorMapper<K1 extends WritableComparable<?>,V1 extends Writable> This class implements the generic mapper of Aggregate. -
Uses of Mapper in org.apache.hadoop.mapreduce.lib.chain
Subclasses of Mapper in org.apache.hadoop.mapreduce.lib.chainModifier and TypeClassDescriptionclassChainMapper<KEYIN,VALUEIN, KEYOUT, VALUEOUT> The ChainMapper class allows to use multiple Mapper classes within a single Map task.Method parameters in org.apache.hadoop.mapreduce.lib.chain with type arguments of type MapperModifier and TypeMethodDescriptionstatic voidChainMapper.addMapper(Job job, Class<? extends Mapper> klass, Class<?> inputKeyClass, Class<?> inputValueClass, Class<?> outputKeyClass, Class<?> outputValueClass, Configuration mapperConf) Adds aMapperclass to the chain mapper.static voidChainReducer.addMapper(Job job, Class<? extends Mapper> klass, Class<?> inputKeyClass, Class<?> inputValueClass, Class<?> outputKeyClass, Class<?> outputValueClass, Configuration mapperConf) Adds aMapperclass to the chain reducer. -
Uses of Mapper in org.apache.hadoop.mapreduce.lib.fieldsel
Subclasses of Mapper in org.apache.hadoop.mapreduce.lib.fieldselModifier and TypeClassDescriptionclassFieldSelectionMapper<K,V> This class implements a mapper class that can be used to perform field selections in a manner similar to unix cut. -
Uses of Mapper in org.apache.hadoop.mapreduce.lib.map
Subclasses of Mapper in org.apache.hadoop.mapreduce.lib.mapModifier and TypeClassDescriptionclassInverseMapper<K,V> AMapperthat swaps keys and values.classMultithreadedMapper<K1,V1, K2, V2> Multithreaded implementation for @link org.apache.hadoop.mapreduce.Mapper.classRegexMapper<K>AMapperthat extracts text matching a regular expression.classTokenize the input values and emit each word with a count of 1.classWrappedMapper<KEYIN,VALUEIN, KEYOUT, VALUEOUT> AMapperwhich wraps a given one to allow customMapper.Contextimplementations.Methods in org.apache.hadoop.mapreduce.lib.map that return types with arguments of type MapperModifier and TypeMethodDescriptionMultithreadedMapper.getMapperClass(JobContext job) Get the application's mapper class.Method parameters in org.apache.hadoop.mapreduce.lib.map with type arguments of type MapperModifier and TypeMethodDescriptionstatic <K1,V1, K2, V2>
voidMultithreadedMapper.setMapperClass(Job job, Class<? extends Mapper<K1, V1, K2, V2>> cls) Set the application's mapper class.