Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/929#issuecomment-50574626
LGTM. Waiting for Jenkins. Btw, @witgo if you have a big dataset to test,
could you try to set the storage level of ratings and user/product in/out links
to `MEMORY_AND_DISK_SER` and enable `spark.rdd.compress`. It will save a lot of
memory with a little overhead on the speed.
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