Github user JoshRosen commented on the issue:
https://github.com/apache/spark/pull/14016
If I recall, the original motivation for preferring the `python2.7`
executable to plain `python` was that `python` might be Python 2.6 on older
CentOS / RHEL systems and certain parts of PySpark performance are adversely
impacted by Python 2.6. Given that we're planning to drop Python 2.6 support,
this may no longer be necessary.
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