HeartSaVioR commented on issue #25702: [WIP][SPARK-29001][CORE] Print event thread stack trace when EventQueue starts to drop events URL: https://github.com/apache/spark/pull/25702#issuecomment-529047449 It might help if listener thread is stuck on processing specific event, but it could be innocent as slow events might be processed before the event queue starts to drop events. I could only imagine measuring elapsed time on each event/listener and log warning message once it exceeds specific threshold (configurable? hardcoded?).
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