The purpose of this chapter is to have a sorted values for reducer keys. For example, if our input is like time series (sample is given below), the the values for each key is sorted.
org.dataalgorithms.chap02.mapreduce
| Class Name | Description |
|---|---|
| CompositeKey | Defines a composite key |
| CompositeKeyComparator | Defines how a CompositeKey will be sorted |
| NaturalKeyGroupingComparator | Defines how a NaturalKey is sorted |
| NaturalKeyPartitioner | Defines how NaturalKey(s) are partitio |
| NaturalValue | Defines a NaturalValue |
| SecondarySortDriver | Driver to submit a MapReduce job |
| SecondarySortMapper | Defines map() |
| SecondarySortReducer | Defines reduce() |