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https://issues.apache.org/jira/browse/HIVE-22502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16989298#comment-16989298
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Hive QA commented on HIVE-22502:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12987559/HIVE-22502.1.patch

{color:red}ERROR:{color} -1 due to no test(s) being added or modified.

{color:green}SUCCESS:{color} +1 due to 17758 tests passed

Test results: 
https://builds.apache.org/job/PreCommit-HIVE-Build/19764/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/19764/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-19764/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.YetusPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12987559 - PreCommit-HIVE-Build

> 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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