Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/7484#issuecomment-123572977
FYI, this used to be on by default (and not flagged) until August last
year, when this commit turned it off:
http://mail-archives.apache.org/mod_mbox/spark-commits/201408.mbox/%[email protected]%3E.
It doesn't seem horrible to keep it off forever since it created some problems
before. The main place it helped was if you call first(), take() etc on a
dataset when working interactively, but maybe sending one task isn't that bad.
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