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https://issues.apache.org/jira/browse/HIVE-22502?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Magyar updated HIVE-22502:
---------------------------------
Attachment: HIVE-22502.1.patch
> ConcurrentModificationException in TriggerValidatorRunnable stops trigger
> processing
> ------------------------------------------------------------------------------------
>
> Key: HIVE-22502
> URL: https://issues.apache.org/jira/browse/HIVE-22502
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Reporter: Attila Magyar
> Assignee: Attila Magyar
> Priority: Major
> Attachments: HIVE-22502.1.patch
>
>
> An other thread is modifying the list the contains the sessions while
> TriggerValidatorRunnable is traversing it. This causes the
> TriggerValidatorRunnable thread to die and triggers are no longer properly
> monitored.
>
> {code:java}
> <12>1 2019-11-14T00:31:12.187Z
> hiveserver2-0.hiveserver2-service.compute-1572769905-6965.svc.cluster.local
> hiveserver2 1 fa2f30b6-ffb3-11e9-93ba-0a257c2413a2 [mdc@18060
> class="tez.TriggerValidatorRunnable" level="WARN" thread="TriggerValidator"]
> TriggerValidatorRunnable caught exception.<12>1 2019-11-14T00:31:12.187Z
> hiveserver2-0.hiveserver2-service.compute-1572769905-6965.svc.cluster.local
> hiveserver2 1 fa2f30b6-ffb3-11e9-93ba-0a257c2413a2 [mdc@18060
> class="tez.TriggerValidatorRunnable" level="WARN" thread="TriggerValidator"]
> TriggerValidatorRunnable caught
> exception.java.util.ConcurrentModificationException at
> java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:966) at
> java.util.LinkedList$ListItr.next(LinkedList.java:888) at
> java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1044) at
> org.apache.hadoop.hive.ql.exec.tez.TriggerValidatorRunnable.run(TriggerValidatorRunnable.java:49)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
> 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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