Github user ouyangxiaochen commented on the issue:
https://github.com/apache/spark/pull/22813
@srowen Your suggestion is very good, but sometimes the maintenance
engineers have limited skills in this area. If they configures the operating
system root directory as `SPARK_WORK_DIR` due to disk damage, it will bring a
catastrophic accident. So, I think it is necessary to add this condition to
avoid this production accidents.
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