Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/5572#issuecomment-105255778
Hi @squito , I don't think calling `rdd2.iterator.toArray` in
`CartesianRDD.compute` is a good idea. Every spark task will run `RDD.compute`
and one node may have multiply running tasks at the same time, which generate
many arrays inside one JVM and waste a lot of memory.
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