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Posted to dev@mahout.apache.org by "Hudson (JIRA)" <ji...@apache.org> on 2013/03/06 15:14:13 UTC
[jira] [Commented] (MAHOUT-1151) Object reuse in distributed ALS

    [ https://issues.apache.org/jira/browse/MAHOUT-1151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13594730#comment-13594730 ] 

Hudson commented on MAHOUT-1151:
--------------------------------

Integrated in Mahout-Quality #1885 (See [https://builds.apache.org/job/Mahout-Quality/1885/])
    MAHOUT-1151 Object reuse in distributed ALS, fixed typo (Revision 1453315)
MAHOUT-1151 Object reuse in distributed ALS (Revision 1453310)

     Result = SUCCESS
ssc : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1453315
Files : 
* /mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/hadoop/als/RecommenderJob.java

ssc : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1453310
Files : 
* /mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/common/FixedSizePriorityQueue.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/hadoop/als/ParallelALSFactorizationJob.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/hadoop/als/RecommenderJob.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/recommender/GenericRecommendedItem.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/recommender/RecommendedItem.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/common/mapreduce/MergeVectorsReducer.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/math/VectorWritable.java

                
> Object reuse in distributed ALS
> -------------------------------
>
>                 Key: MAHOUT-1151
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1151
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Collaborative Filtering
>    Affects Versions: 0.8
>            Reporter: Sebastian Schelter
>            Assignee: Sebastian Schelter
>         Attachments: MAHOUT-1151.patch
>
>
> In order to improve the performance our distributed ALS code, we should try to avoid object instantiation as much as possible, especially when it is done per input tuple.

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