liupc commented on issue #23842: [SPARK-26927]Fix race condition may cause dynamic allocation not working URL: https://github.com/apache/spark/pull/23842#issuecomment-469565045 @Ngone51 The `ExecutorAllocationListener` is added to `executorManagement` queue, which is an `AsyncQueue`, and allows events to be dropped. See below link: https://github.com/apache/spark/blob/7857c6d633f3df426a6ac4618316eb83b1cefe2b/core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala#L247
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