zjureel commented on pull request #18303:
URL: https://github.com/apache/flink/pull/18303#issuecomment-1011768126


   Thanks @xintongsong. Replace `ExecutorService#shutdownNow` with 
`Executor#awaitTermination` is not feasible, while the main target of 
`ExecutorService` is to clear the pending tasks when it closed. But it's a good 
idea to check the delay value in `MainThreadExecutor#schedule` before add it to 
`ExecutorService`, I'll try it. THX


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