liupc commented on issue #27002: [SPARK-30346][CORE]Improve logging when events dropped URL: https://github.com/apache/spark/pull/27002#issuecomment-571377672 Thanks for reply @vanzin, I think this log can still do much help even after it was logged at first, in real cluster, the logging always configured as rolling by size, and the log is rolling fast, expecially for SparkSQL thriftserver case. With this log we can still know what happened and probably find out what make it slow with the threaddump even after the log was rolled.
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