如题，standalone，1.12。 目前感觉不像是停止任务或启动任务本身问题。看起来像是这俩操作导致JM的压力大什么的。然后报错异常如下：
2021-03-03 10:14:51,298 ERROR org.apache.flink.runtime.util.FatalExitExceptionHandler [] - FATAL: Thread 'cluster-io-thread-3' produced an uncaught exception. Stopping the process... java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor $ScheduledFutureTask@422cfccb rejected from java.util.concurrent.ScheduledThreadPoolExecutor@6709b3f5[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 2304] at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2063) ~[?:1.8.0_251] at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:830) ~[?:1.8.0_251] at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:326) ~[?:1.8.0_251] at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:533) ~[?:1.8.0_251] at java.util.concurrent.ScheduledThreadPoolExecutor.execute(ScheduledThreadPoolExecutor.java:622) ~[?:1.8.0_251] at java.util.concurrent.Executors$DelegatedExecutorService.execute(Executors.java:668) ~[?:1.8.0_251] at org.apache.flink.runtime.concurrent.ScheduledExecutorServiceAdapter.execute(ScheduledExecutorServiceAdapter.java:62) ~[flink-dist_2.11-1.12.0.jar:1.12.0] at org.apache.flink.runtime.checkpoint.CheckpointCoordinator.scheduleTriggerRequest(CheckpointCoordinator.java:1152) ~[flink-dist_2.11-1.12.0.jar:1.12.0] at org.apache.flink.runtime.checkpoint.CheckpointsCleaner.lambda$cleanCheckpoint$0(CheckpointsCleaner.java:58) ~[flink-dist_2.11-1.12.0.jar:1.12.0] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[?:1.8.0_251] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_251] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_251]
