Strange error from scheduler

[jsi]

This may just be a small hiccup, but I thought I'd mention it: If I start a clean XP system and then just stop it again, using the CLI, I get this error when I stop it:

2021-05-20 16:35:31,749 WARN  c.e.x.i.s.distributed.RescheduleTask - Problem during task scheduling.
java.lang.IllegalStateException: No service found interface com.enonic.xp.scheduler.SchedulerService
	at com.enonic.xp.core.internal.osgi.OsgiSupport.lambda$withService$3(OsgiSupport.java:97)
	at com.enonic.xp.core.internal.osgi.OsgiSupport.withServiceOrElseGet(OsgiSupport.java:59)
	at com.enonic.xp.core.internal.osgi.OsgiSupport.withService(OsgiSupport.java:96)
	at com.enonic.xp.impl.scheduler.distributed.RescheduleTask.doRun(RescheduleTask.java:52)
	at com.enonic.xp.impl.scheduler.distributed.RescheduleTask.run(RescheduleTask.java:42)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)

[rymsha]

It is not an error. It is a warning

[vbradnitski]

There is also warning log level for CancelationException, should be changed to debug.

2021-05-31 17:21:00,004 WARN  c.e.x.i.s.d.SchedulableTaskImpl - Error while running job. java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@1a8576f0[Cancelled]
java.util.concurrent.CancellationException: null
        at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:121)
        at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)
        at com.enonic.xp.impl.scheduler.LocalSystemScheduler$1.afterExecute(LocalSystemScheduler.java:53)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1129)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
        at java.base/java.lang.Thread.run(Thread.java:829)

[rymsha]

java.lang.IllegalStateException: No service found interface com.enonic.xp.scheduler.SchedulerService can also happen during dump restore. We should find a way to stop scheduler before dump starts / instance shuts down.

[rymsha]

• Warning Problem during task scheduling appears often on XP shutdown when it is benign, but it may be also an indicator of a serious bug (then it should repeat often - almost every second). We could throttle logging: write WARN only if there were 9 subsequent failed attempts before.

• java.util.concurrent.CancellationException is not interesting in most cases, and we change it to debug level.

• Dump restore is a special case when most of services can't function. We will stop scheduler right before dump restore starts.