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MapReduce Tutorial : Custom data types
An important feature of the Java API is that custom data and format types can be provided. In this step we implement two custom data types.
BERIntWritable
We want to implement BERIntWritable, which is an int stored in the format of pack “w”, $num. Quoting: The bytes represent an unsigned integer in base 128, most significant digit first, with as few digits as possible. Bit eight (the high bit) is set on each byte except the last.
The new class must implement the Writable interface: