Github user srowen commented on the issue:
https://github.com/apache/spark/pull/19919
Hm, I thought the default would appear in `.../config/package.scala`, but I
don't see it. I'm not actually sure it defaults to 2 anywhere (?) . (@vanzin
does this ring a bell?) I don't think these changes should be made, but I'm
also wondering if the docs are correct that the default is 2.
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