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https://issues.apache.org/jira/browse/MAHOUT-736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13051744#comment-13051744
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Hudson commented on MAHOUT-736:
-------------------------------
Integrated in Mahout-Quality #892 (See
[https://builds.apache.org/job/Mahout-Quality/892/])
MAHOUT-736 Save one pass through the data in ItemSimilarityJob and
RecommenderJob by intelligently using counters
ssc : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1137456
Files :
*
/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/hadoop/similarity/item/CountUsersKeyWritable.java
*
/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/hadoop/similarity/item/CountUsersMapper.java
*
/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/hadoop/similarity/item/CountUsersReducer.java
*
/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/hadoop/item/ToUserVectorReducer.java
*
/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/hadoop/TasteHadoopUtils.java
*
/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/hadoop/item/RecommenderJob.java
*
/mahout/trunk/core/src/test/java/org/apache/mahout/cf/taste/hadoop/similarity/item/ItemSimilarityJobTest.java
*
/mahout/trunk/core/src/test/java/org/apache/mahout/cf/taste/hadoop/item/ToUserVectorReducerTest.java
*
/mahout/trunk/core/src/test/java/org/apache/mahout/cf/taste/hadoop/item/RecommenderJobTest.java
*
/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/hadoop/similarity/item/CountUsersCombiner.java
*
/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/hadoop/similarity/item/ItemSimilarityJob.java
> Save one pass through the data in ItemSimilarityJob and RecommenderJob by
> intelligently using counters
> ------------------------------------------------------------------------------------------------------
>
> Key: MAHOUT-736
> URL: https://issues.apache.org/jira/browse/MAHOUT-736
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.6
> Reporter: Sebastian Schelter
> Assignee: Sebastian Schelter
> Fix For: 0.6
>
> Attachments: MAHOUT-736.patch
>
>
> Both ItemSimilarityJob and RecommenderJob have to find the overall number of
> users. This was done with an M/R pass over the data. Instead of that we can
> use a counter in a previous pass over the data (similar to the way the total
> number of ngrams if collected in CollocDriver) and thereby save one pass
> through the data.
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