Github user 10110346 commented on the issue:
https://github.com/apache/spark/pull/19690
yea, so we make the default value for this configuration is `true`.
I set spark.executor.extraJavaOptions=-verbose:gc -XX:+PrintGCDetails
-XX:+PrintGCDateStamps -XX:+PrintTenuringDistribution -XX:+PrintHeapAtGC, and
a lot of GC prints are produced
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