Github user rdblue commented on the issue: https://github.com/apache/spark/pull/21071 @devaraj-kavali, do you have any measurements to quantify how this impacts overall performance? We would want to know before releasing this for use because using HTrace means having it on all the time to be able to analyze slow-downs. Like @steveloughran suggests, it should also be optional (unless there is no measurable cost to having it on all the time).
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