[jira] Closed: (MAHOUT-317) Collocations: Eliminate in-memory frequency calculation

["Drew Farris (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-317?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Drew Farris closed MAHOUT-317.
------------------------------


> Collocations: Eliminate in-memory frequency calculation
> -------------------------------------------------------
>
>                 Key: MAHOUT-317
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-317
>             Project: Mahout
>          Issue Type: Improvement
>    Affects Versions: 0.3
>            Reporter: Drew Farris
>            Assignee: Drew Farris
>             Fix For: 0.3
>
>         Attachments: MAHOUT-317.patch, MAHOUT-317.patch, MAHOUT-317.patch, MAHOUT-317.patch
>
>
> 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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