Github user mridulm commented on the issue:
https://github.com/apache/spark/pull/16697
Instead of keeping track of the history of dropped events, which will
become expensive very fast, how about logging the current event (if dropped)
when we log at
[#L146][https://github.com/apache/spark/blob/6ee28423ad1b2e6089b82af64a31d77d3552bb38/core/src/main/scala/org/apache/spark/scheduler/LiveListenerBus.scala#L146]
There can be a logTrace line at line
[133][https://github.com/apache/spark/blob/6ee28423ad1b2e6089b82af64a31d77d3552bb38/core/src/main/scala/org/apache/spark/scheduler/LiveListenerBus.scala#L133]
if you do want to log all dropped events.
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