Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/813#issuecomment-43465440
Thanks for submitting this. Instead of allowing 4 (and maybe 5), users can
certainly use the cogroup RDD's constructor to construct cogroups of arbitrary
RDDs. If that is inconvenient, perhaps we should think about a cogroup
interface that either takes varargs, or just a sequence/list of RDDs?
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