Github user JoshRosen commented on the issue: https://github.com/apache/spark/pull/17955 I've been running some local tests of scheduler throughput to make sure that this doesn't adversely affect performance in the processing of task completion events (I discovered the perf. hotspot fixed in #18008 as part of this testing). I'm planning to run more comprehensive end-to-end tests on real clusters (with injected failures) in the next couple of days.
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