Add Writable implementations for variable-length integer types.
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Key: HADOOP-850
URL: http://issues.apache.org/jira/browse/HADOOP-850
Project: Hadoop
Issue Type: Improvement
Components: io
Affects Versions: 0.10.0
Reporter: Andrzej Bialecki
Assigned To: Andrzej Bialecki
Priority: Minor
Fix For: 0.10.0
Currently Hadoop supports only three basic integer-like types: ByteWritable,
IntWritable and LongWritable. They provide a fixed tradeoff between their value
range and on-disk space consumption. But it is sometimes useful to be able to
store integer values with broader allowed range, but less space consumption
when possible.
This is especially useful when storing very long series of values, combined
with delta encoding.
Lucene already implements variable-length encoding for positive int and long. I
propose to add similar Writable implementations, which use the same encoding
methods.
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