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https://issues.apache.org/jira/browse/SPARK-1281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Wendell updated SPARK-1281:
-----------------------------------
Assignee: Tor Myklebust
> 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
> Assignee: Tor Myklebust
> 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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