| Class | Description | 
|---|---|
| DoubleDoubleWritable | Double-double Pair Writable | 
| IntDoubleWritable | Int-Double Pair Writable | 
| IntIntWritable | Int-Int Pair Writable | 
| IntLongWritable | Int-Long Pair Writable | 
| LongDoubleWritable | Long-Double Pair Writable | 
| LongIntWritable | Long-Int Pair Writable | 
| LongLongWritable | Long-Long Pair Writable | 
| PairWritable<L extends org.apache.hadoop.io.Writable,R extends org.apache.hadoop.io.Writable> | Pair Writable class, that knows types upfront and can deserialize itself. | 
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