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[SPARK-15606][CORE] Use non-blocking removeExecutor call to avoid dea…
…dlocks ## What changes were proposed in this pull request? Set minimum number of dispatcher threads to 3 to avoid deadlocks on machines with only 2 cores ## How was this patch tested? Spark test builds Author: Pete Robbins <robbinspg@gmail.com> Closes #13355 from robbinspg/SPARK-13906.
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