Github user suyanNone commented on the issue:
https://github.com/apache/spark/pull/17936
So careless to notice UnsafeCartesianRDD's
ExternalAppendOnlyUnsafeRowArray, that nice, I am not read all discussion
here...the solution unify with unsafeCartesionRDD already have a big
improvement for CartesionRDD, and it seams more simple and easy to
understand... (In our inner change, we adopt a memory and disk array to store
graphx Array[EdgeAttr])... I not sure it will have a strong optimize
requirement to avoid per task locality...
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