[jira] Resolved: (MAHOUT-474) Should compress output of Job pairwiseSimilarity and Job asMatrix

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved MAHOUT-474.
------------------------------

         Assignee: Sean Owen
    Fix Version/s:     (was: 0.4)
       Resolution: Not A Problem

AbstractJob already helps make intermediate stages compress their output. I don't want to force the final output to be compressed. That is up to the caller to set if desired.

> Should compress output of Job pairwiseSimilarity and Job asMatrix
> -----------------------------------------------------------------
>
>                 Key: MAHOUT-474
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-474
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Collaborative Filtering
>    Affects Versions: 0.4
>            Reporter: Han Hui Wen 
>            Assignee: Sean Owen
>
> !https://issues.apache.org/jira/secure/attachment/12451985/RowSimilarityJob-CooccurrencesMapper-SimilarityReducer.jpg!
>  From above picture ,we can see that the output of pairwiseSimilarity is very large ,we should compress them.
>       SequenceFileOutputFormat.setOutputCompressionType(job, style);
>       SequenceFileOutputFormat.setCompressOutput(job, compress);
>       SequenceFileOutputFormat.setOutputCompressorClass(job, codecClass)

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