Github user srowen commented on the issue:
https://github.com/apache/spark/pull/14137
You have introduced a new problem though -- you're not unpersisting the
RDDs you cache, and, you're doing a needless count (minor). Of course it's
faster to operate on the final RDD at the end: you did the work as you went
instead of at the end. It's actually slower overall though. Right? I'm not yet
clear what this is solving
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