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From "Patrick Wendell (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-1281) Partitioning in ALS
Date Wed, 23 Apr 2014 02:24:21 GMT

     [ https://issues.apache.org/jira/browse/SPARK-1281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Patrick Wendell resolved SPARK-1281.
------------------------------------

       Resolution: Fixed
    Fix Version/s: 1.0.0

> Partitioning in ALS
> -------------------
>
>                 Key: SPARK-1281
>                 URL: https://issues.apache.org/jira/browse/SPARK-1281
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>            Reporter: Xiangrui Meng
>            Priority: Minor
>             Fix For: 1.0.0
>
>
> There are some minor issues about partitioning with the current implementation of ALS:
> 1. Mod-based partitioner is used for mapping users/products to blocks. This might cause
problems if the ids contains information. For example, the last digit may indicate the user/product
type. This can be fixed by hashing.
> 2. HashPartitioner is used on the initial partition. This is the same as the mod-based
partitioner when the key is a positive integer. But it is certainly error-prone.



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