Intermittent IllegalStateException: Unknown background task executor error on Elasticsearch6 AutoUpgrade tests

• Type: Regression Bug
• Status: Closed
• Resolution: No Longer Reproducible
• Affects Version/s: Master
• Fix Version/s: Master
• Component/s: Search Infrastructure
• Labels:
  • QA-AUTOMATION
  • backend_test_fix
  • flaky_test_search
• Fix Priority: 3
• Epic Link: Flow Forward
• Sprint: Search|S03 Sprint 13| 3.16-4.6
• QA Test Name:
  • LocalFile.SearchUpgrade#ViewClassicSearchPortletConfigurationArchiveAutoUpgrade721
• QA Test Score: 5

The functional steps of the test completed successfully, and the tests only failed due to the errors in the log.

Incidences: 

Date	Test Name	Branch	Location	Full Console
3/23/2020	SearchUpgrade#ViewClassicSearchPortletConfigurationArchiveAutoUpgrade72101	Master	ci:test:search	03232020-1
3/23/2020	SearchUpgrade#ViewSearchPortletsConfigurationArchiveAutoUpgrade721	Master	ci:test:search	03232020-2
3/23/2020	SearchUpgrade#ViewClassicSearchPortletConfigurationArchiveAutoUpgrade72101	Master	ci:test:search-es7	03232020-3
3/23/2020	SearchUpgrade#ViewSearchPortletsConfigurationArchiveAutoUpgrade721	Master	ci:test:search-solr	03232020-4
3/24/2020	SearchUpgrade#ViewClassicSearchPortletConfigurationArchiveAutoUpgrade72101	Master	ci:test:search	03242020-1
3/24/2020	SearchUpgrade#ViewClassicSearchPortletConfigurationArchiveAutoUpgrade72101	Master	ci:test:search-solr	03242020-2
3/24/2020	SearchUpgrade#ViewSearchPortletsConfigurationArchiveAutoUpgrade721	Master	ci:test:search-solr	03242020-3
3/24/2020	SearchUpgrade#ViewClassicSearchPortletConfigurationArchiveAutoUpgrade721	Master	ci:test:search-es7	03242020-4
3/24/2020	SearchUpgrade#ViewClassicSearchPortletConfigurationArchiveAutoUpgrade72101	Master	ci:test:search-es7	03242020-5
3/24/2020	SearchUpgrade#ViewSearchPortletsConfigurationArchiveAutoUpgrade721	Master	ci:test:search-es7	03242020-6
3/27/2020	SearchUpgrade#ViewClassicSearchPortletConfigurationArchiveAutoUpgrade721	Master	ci:test:search	03272020-1
3/27/2020	SearchUpgrade#ViewClassicSearchPortletConfigurationArchiveAutoUpgrade721	Master	ci:test:search-es7	03272020-2

[exec] 14:07:58,098 ERROR [liferay/background_task-4][BackgroundTaskMessageListener:182] Unable to execute background task
     [exec] java.lang.IllegalStateException: Unknown background task executor com.liferay.portal.search.internal.background.task.ReindexSingleIndexerBackgroundTaskExecutor
     [exec] 	at com.liferay.portal.background.task.internal.messaging.BackgroundTaskMessageListener.getBackgroundTaskExecutor(BackgroundTaskMessageListener.java:237)
     [exec] 	at com.liferay.portal.background.task.internal.messaging.BackgroundTaskMessageListener.wrapBackgroundTaskExecutor(BackgroundTaskMessageListener.java:288)
     [exec] 	at com.liferay.portal.background.task.internal.messaging.BackgroundTaskMessageListener.doReceive(BackgroundTaskMessageListener.java:109)
     [exec] 	at com.liferay.portal.kernel.messaging.BaseMessageListener.receive(BaseMessageListener.java:26)
     [exec] 	at com.liferay.portal.kernel.messaging.InvokerMessageListener.receive(InvokerMessageListener.java:74)
     [exec] 	at com.liferay.portal.messaging.internal.ParallelDestination$1.run(ParallelDestination.java:56)
     [exec] 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
     [exec] 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
     [exec] 	at java.lang.Thread.run(Thread.java:745)
     [exec] 14:07:58,098 ERROR [liferay/background_task-3][BackgroundTaskMessageListener:182] Unable to execute background task
     [exec] java.lang.IllegalStateException: Unknown background task executor com.liferay.portal.search.internal.background.task.ReindexSingleIndexerBackgroundTaskExecutor
     [exec] 	at com.liferay.portal.background.task.internal.messaging.BackgroundTaskMessageListener.getBackgroundTaskExecutor(BackgroundTaskMessageListener.java:237)
     [exec] 	at com.liferay.portal.background.task.internal.messaging.BackgroundTaskMessageListener.wrapBackgroundTaskExecutor(BackgroundTaskMessageListener.java:288)
     [exec] 	at com.liferay.portal.background.task.internal.messaging.BackgroundTaskMessageListener.doReceive(BackgroundTaskMessageListener.java:109)
     [exec] 	at com.liferay.portal.kernel.messaging.BaseMessageListener.receive(BaseMessageListener.java:26)
     [exec] 	at com.liferay.portal.kernel.messaging.InvokerMessageListener.receive(InvokerMessageListener.java:74)
     [exec] 	at com.liferay.portal.messaging.internal.ParallelDestination$1.run(ParallelDestination.java:56)
     [exec] 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
     [exec] 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
     [exec] 	at java.lang.Thread.run(Thread.java:745)

Note: Checked the history of all PortalSmokeUpgrade tests and did not see error in any of the other ViewPortalSmokeArchive tests.