wangyum opened a new pull request #28068: [MINOR][CORE] Remove two unused variables in LiveListenerBus URL: https://github.com/apache/spark/pull/28068 ### What changes were proposed in this pull request? This PR removes two unused variables in `LiveListenerBus`. These two variables have moved to [AsyncEventQueue.scala#L67-L71](https://github.com/apache/spark/blob/5b873420b039f61b85bf349443eb830556fab339/core/src/main/scala/org/apache/spark/scheduler/AsyncEventQueue.scala#L67-L71) ### Why are the changes needed? Removes unused variables. ### Does this PR introduce any user-facing change? No. ### How was this patch tested? Exist test.
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