org.apache.hadoop.mapred.lib.aggregate
Class ValueAggregatorJobBase<K1 extends WritableComparable,V1 extends Writable>

java.lang.Object
  extended by org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorJobBase<K1,V1>
All Implemented Interfaces:
Closeable, JobConfigurable, Mapper<K1,V1,Text,Text>, Reducer<Text,Text,Text,Text>
Direct Known Subclasses:
ValueAggregatorCombiner, ValueAggregatorMapper, ValueAggregatorReducer

@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract class ValueAggregatorJobBase<K1 extends WritableComparable,V1 extends Writable>
extends Object
implements Mapper<K1,V1,Text,Text>, Reducer<Text,Text,Text,Text>

This abstract class implements some common functionalities of the the generic mapper, reducer and combiner classes of Aggregate.


Field Summary
protected  ArrayList<ValueAggregatorDescriptor> aggregatorDescriptorList
           
 
Constructor Summary
ValueAggregatorJobBase()
           
 
Method Summary
 void close()
           
 void configure(JobConf job)
          Initializes a new instance from a JobConf.
protected  void logSpec()
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface org.apache.hadoop.mapred.Mapper
map
 
Methods inherited from interface org.apache.hadoop.mapred.Reducer
reduce
 

Field Detail

aggregatorDescriptorList

protected ArrayList<ValueAggregatorDescriptor> aggregatorDescriptorList
Constructor Detail

ValueAggregatorJobBase

public ValueAggregatorJobBase()
Method Detail

configure

public void configure(JobConf job)
Description copied from interface: JobConfigurable
Initializes a new instance from a JobConf.

Specified by:
configure in interface JobConfigurable
Parameters:
job - the configuration

logSpec

protected void logSpec()

close

public void close()
           throws IOException
Specified by:
close in interface Closeable
Throws:
IOException


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