Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/4420#issuecomment-75162077
I would not make it configurable for the same reason. I don't have a great
sense of what the value should be off the top of my head. It would be good to
deduce it from empirical data collected from real workloads of varying
requirements (a few large items, many large items, mostly small items, very few
small items etc.). By the way if you intend to do that please also change the
description and the title on the PR.
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