Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/17442
We shouldn't set the default to this value. Algo v2 has different
correctness characteristics from v1 - yeah, it's faster especially in FSes like
S3, but it also more likely to lead to bad data when things fail.
If a user is comfortable with the trade-offs they can set this in their own
configuration.
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