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https://issues.apache.org/jira/browse/HDDS-7842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17695228#comment-17695228
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George Huang commented on HDDS-7842:
------------------------------------

from DN log with latest parcel build:


|BackgroundService|Background task execution failed
java.lang.NullPointerException
        at 
org.apache.hadoop.ozone.container.keyvalue.statemachine.background.StaleRecoveringContainerScrubbingService$RecoveringContainerScrubbingTask.call(StaleRecoveringContainerScrubbingService.java:87)
        at 
org.apache.hadoop.hdds.utils.BackgroundService$PeriodicalTask.lambda$run$0(BackgroundService.java:121)
        at 
java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1736)
        at 
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at 
java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
        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:834)|

> java.lang.NullPointerException: 
> hadoop.ozone.container.keyvalue.statemachine.background.StaleRecoveringContainerScrubbingService
> --------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDDS-7842
>                 URL: https://issues.apache.org/jira/browse/HDDS-7842
>             Project: Apache Ozone
>          Issue Type: Bug
>            Reporter: George Huang
>            Assignee: Swaminathan Balachandran
>            Priority: Major
>
> {code:java}
> Background task execution failed
> java.lang.NullPointerException
> at 
> org.apache.hadoop.ozone.container.keyvalue.statemachine.background.StaleRecoveringContainerScrubbingService$RecoveringContainerScrubbingTask.call(StaleRecoveringContainerScrubbingService.java:87)
> at 
> org.apache.hadoop.hdds.utils.BackgroundService$PeriodicalTask.lambda$run$0(BackgroundService.java:121)
> at 
> java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1640)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
> at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748){code}



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