Github user vanzin commented on the issue: https://github.com/apache/spark/pull/22609 @gengliangwang is right; there are still things that need to be done when the UI is disabled; job, stage and executor info are all still exposed even if the UI is disabled, and the task even callbacks update those. It might be as easy as not adding the task to `liveTasks` in `onTaskStart`, but haven't really looked in detail.
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