Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/3022#issuecomment-67087866
I just found out (hearsay) that Accumulator may incur a big performance
penalty relative to methods like RDD.aggregate(). There have also been some
bugs found with Accumulator in the past. So it might be worth switching from
using Accumulators to using aggregate() and other methods. The aggregations
are pretty simple, so it shouldn't make the code any longer.
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