Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/407#issuecomment-40888823
Since we donât separate user partitioner and product partitioner. With
little chance a user can set a different partitioner that works magically
better than the default, unless the user ids are separated from product ids, so
the partitioner knows whether this is a user or a product. Maybe we should not
let the partitioner be configurable. 'setNumBlocks' should update partitioner.
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