Collocations: Eliminate in-memory frequency calculation
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Key: MAHOUT-317
URL: https://issues.apache.org/jira/browse/MAHOUT-317
Project: Mahout
Issue Type: Improvement
Affects Versions: 0.3
Reporter: Drew Farris
Fix For: 0.3
see:
http://www.lucidimagination.com/search/document/ae484d53e969250e/who_owns_mahout_bucket_on_s3
The collocation code currently uses maps in the CollocCombiner and
CollocReducer to perform frequency calculations which can cause the process to
exceed the heap space if a large number of ngrams exist for any given subgram.
Convert the code to use a composite key / secondary sort to avoid the need for
in-memory map for frequency calculations.
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