Added support for mapping String to long IDs in CF code
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Key: MAHOUT-162
URL: https://issues.apache.org/jira/browse/MAHOUT-162
Project: Mahout
Issue Type: Improvement
Components: Collaborative Filtering
Affects Versions: 0.2
Reporter: Sean Owen
Assignee: Sean Owen
Fix For: 0.2
Since the framework now only allows long (64-bit integer) IDs, and no longer
Strings, we need to provide some support for translating between the two. The
basic proposal is this:
- Define a one-way mapping from Strings to longs that is repeatable and easy to
implement in many contexts. In particular I propose using the bottom 64 bits of
the MD5 hash of a string.
- Define support for storing the reverse mapping (longs to Strings) in various
ways, in an efficient way, that handles gracefully the very rare possibility of
collision
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