jiangxb1987 commented on issue #26614: [SPARK-29976][CORE] New conf for single task stage speculation URL: https://github.com/apache/spark/pull/26614#issuecomment-558370705 +1 for restricting the total running tasks <= the number of slots in one executor. This ensures when there are suspicious tasks that didn't finish after a while (most likely hang) we could start speculative runs, on the other hand, this ensures the speculative tasks started won't waste resources identical to one executor.
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