pdeva commented on issue #8137: coordinator throwing exception trying to load segments URL: https://github.com/apache/incubator-druid/issues/8137#issuecomment-514337890 here is another more detailed exception: ``` 2019-07-23 18:33:15,490 ERROR o.a.d.s.c.DruidCoordinator [Coordinator-Exec--0] Exception moving segment kube-metrics-second_2019-06-20T11:00:00.000Z_2019-06-20T12:00:00.000Z_2019-06-20T11:00:00.093Z_1: {class=org.apache.druid.server.coordinator.DruidCoordinator, exceptionType=class java.lang.RuntimeException, exceptionMessage=java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@65bf8472 rejected from java.util.concurrent.ScheduledThreadPoolExecutor@63faa5b[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 570]} java.lang.RuntimeException: java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@65bf8472 rejected from java.util.concurrent.ScheduledThreadPoolExecutor@63faa5b[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 570] at org.apache.druid.server.coordinator.DruidCoordinator.moveSegment(DruidCoordinator.java:480) ~[druid-server-0.15.0-incubating-iap2.jar:0.15.0-incubating-iap2] at org.apache.druid.server.coordinator.helper.DruidCoordinatorBalancer.moveSegment(DruidCoordinatorBalancer.java:271) ~[druid-server-0.15.0-incubating-iap2.jar:0.15.0-incubating-iap2] at org.apache.druid.server.coordinator.helper.DruidCoordinatorBalancer.balanceServers(DruidCoordinatorBalancer.java:222) ~[druid-server-0.15.0-incubating-iap2.jar:0.15.0-incubating-iap2] at org.apache.druid.server.coordinator.helper.DruidCoordinatorBalancer.balanceTier(DruidCoordinatorBalancer.java:161) ~[druid-server-0.15.0-incubating-iap2.jar:0.15.0-incubating-iap2] at org.apache.druid.server.coordinator.helper.DruidCoordinatorBalancer.lambda$run$0(DruidCoordinatorBalancer.java:84) ~[druid-server-0.15.0-incubating-iap2.jar:0.15.0-incubating-iap2] at java.util.HashMap.forEach(HashMap.java:1289) [?:1.8.0_181] at org.apache.druid.server.coordinator.helper.DruidCoordinatorBalancer.run(DruidCoordinatorBalancer.java:83) [druid-server-0.15.0-incubating-iap2.jar:0.15.0-incubating-iap2] at org.apache.druid.server.coordinator.DruidCoordinator$CoordinatorRunnable.run(DruidCoordinator.java:716) [druid-server-0.15.0-incubating-iap2.jar:0.15.0-incubating-iap2] at org.apache.druid.server.coordinator.DruidCoordinator$2.call(DruidCoordinator.java:601) [druid-server-0.15.0-incubating-iap2.jar:0.15.0-incubating-iap2] at org.apache.druid.server.coordinator.DruidCoordinator$2.call(DruidCoordinator.java:594) [druid-server-0.15.0-incubating-iap2.jar:0.15.0-incubating-iap2] at org.apache.druid.java.util.common.concurrent.ScheduledExecutors$2.run(ScheduledExecutors.java:92) [druid-core-0.15.0-incubating-iap2.jar:0.15.0-incubating-iap2] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_181] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_181] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [?:1.8.0_181] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [?:1.8.0_181] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_181] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_181] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181] Caused by: java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@65bf8472 rejected from java.util.concurrent.ScheduledThreadPoolExecutor@63faa5b[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 570] at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2063) ~[?:1.8.0_181] at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:830) ~[?:1.8.0_181] at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:326) ~[?:1.8.0_181] at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:533) ~[?:1.8.0_181] at java.util.concurrent.ScheduledThreadPoolExecutor.submit(ScheduledThreadPoolExecutor.java:632) ~[?:1.8.0_181] at org.apache.druid.server.coordinator.CuratorLoadQueuePeon.loadSegment(CuratorLoadQueuePeon.java:181) ~[druid-server-0.15.0-incubating-iap2.jar:0.15.0-incubating-iap2] at org.apache.druid.server.coordinator.DruidCoordinator.moveSegment(DruidCoordinator.java:460) ~[druid-server-0.15.0-incubating-iap2.jar:0.15.0-incubating-iap2] ... 17 more ```
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