Github user markhamstra commented on the issue:
https://github.com/apache/spark/pull/21527
> We should make it configurable.
That's a debatable assertion all by itself -- and quite unfortunately,
there is no more justification for this claim in the JIRA ticket. Without proof
that there is a better configuration under certain circumstances, and without
guidance as to why and how this value should be reconfigured, I'd argue that
adding another knob for users to twiddle just adds confusion, potential for
misconfiguration and more configuration space that is unlikely to be adequately
tested.
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