Package uk.gov.gchq.gaffer.accumulostore.operation.hdfs.reducer

Class AccumuloKeyValueReducer

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<KEY,VALUE,KEY,VALUE>

uk.gov.gchq.gaffer.hdfs.operation.reducer.GafferReducer<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value>

uk.gov.gchq.gaffer.accumulostore.operation.hdfs.reducer.AccumuloKeyValueReducer

public class AccumuloKeyValueReducer
extends GafferReducer<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value>

Reducer for use in bulk import of data into Accumulo. It merges all values associated to the gaffer.accumulostore.key by converting them into Properties and then merges those, and then converts them back to an Accumulo value.

It contains an optimisation so that if there is only one value, we simply output it rather than incurring the cost of deserialising them and then reserialising them.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Reducer

org.apache.hadoop.mapreduce.Reducer.Context

Constructor Summary

Constructors

Constructor	Description
AccumuloKeyValueReducer()

Method Summary

Methods inherited from class org.apache.hadoop.mapreduce.Reducer

run

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AccumuloKeyValueReducer

public AccumuloKeyValueReducer()