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MapReduce Tutorial : Predefined formats and types

The Java API differs from the Perl API in one important aspect: the keys and values are types.

The type of a value must be a subclass of Writable, which provides methods for serializing and deserializing values.

The type of a key must be a subclass of WritableComparable, which provides both Writable and Comparable interface.

Here is a list of frequently used types:

For more complicated types like variable-length encoded integers, dictionaries, bloom filters, etc., see Writable.

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