[
https://issues.apache.org/jira/browse/NIFI-7944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17219853#comment-17219853
]
Mark Payne edited comment on NIFI-7944 at 10/23/20, 5:54 PM:
-------------------------------------------------------------
Furthermore, it looks like if a Controller Service is referencing another
Controller Service, and that referenced service got disabled and deleted, NiFi
will fail to restart.
To replicate, create a Process Group, Group A. Within it, create nothing but a
child group, Group B.
Within Group B, create an AvroSchemaRegistry controller service, a CSV Reader,
and JSON Writer. Configure CSV Reader to use the Avro Schema Registry to get
the schema.
Create GenerateFlowFile -> ConvertRecord (using CSV Reader and JSON Writer) ->
(terminate)
Persist this flow to the registry. Then import the flow a second time.
On the newly imported flow, start all Controller Services, then start the
Processors.
Disable AvroSchemaRegistry service.
Delete AvroSchemaRegistry service.
Restart NiFi.
It will fail to startup with an error like the following:
{code:java}
2020-10-23 13:50:27,129 WARN [main] org.apache.nifi.web.server.JettyServer
Failed to start web server... shutting down.
org.apache.nifi.controller.serialization.FlowSynchronizationException:
java.lang.NullPointerException
at
org.apache.nifi.controller.StandardFlowSynchronizer.sync(StandardFlowSynchronizer.java:306)
at
org.apache.nifi.controller.FlowController.synchronize(FlowController.java:1420)
at
org.apache.nifi.persistence.StandardXMLFlowConfigurationDAO.load(StandardXMLFlowConfigurationDAO.java:89)
at
org.apache.nifi.controller.StandardFlowService.loadFromBytes(StandardFlowService.java:792)
at
org.apache.nifi.controller.StandardFlowService.load(StandardFlowService.java:537)
at
org.apache.nifi.web.contextlistener.ApplicationStartupContextListener.contextInitialized(ApplicationStartupContextListener.java:72)
at
org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:930)
at
org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:553)
at
org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:889)
at
org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:356)
at
org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1445)
at
org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1409)
at
org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:822)
at
org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:275)
at
org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:524)
at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
at
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
at
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
at
org.eclipse.jetty.server.handler.gzip.GzipHandler.doStart(GzipHandler.java:425)
at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
at
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
at
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
at org.eclipse.jetty.server.Server.start(Server.java:407)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
at
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
at org.eclipse.jetty.server.Server.doStart(Server.java:371)
at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
at org.apache.nifi.web.server.JettyServer.start(JettyServer.java:1054)
at org.apache.nifi.NiFi.<init>(NiFi.java:159)
at org.apache.nifi.NiFi.<init>(NiFi.java:71)
at org.apache.nifi.NiFi.main(NiFi.java:302)
Caused by: java.lang.NullPointerException: null
at
org.apache.nifi.controller.service.StandardControllerServiceProvider.enableControllerServices(StandardControllerServiceProvider.java:192)
at
org.apache.nifi.controller.service.ControllerServiceLoader.enableControllerServices(ControllerServiceLoader.java:164)
at
org.apache.nifi.controller.service.ControllerServiceLoader.enableControllerServices(ControllerServiceLoader.java:152)
at
org.apache.nifi.controller.StandardFlowSynchronizer.addControllerServices(StandardFlowSynchronizer.java:1374)
at
org.apache.nifi.controller.StandardFlowSynchronizer.addProcessGroup(StandardFlowSynchronizer.java:1316)
at
org.apache.nifi.controller.StandardFlowSynchronizer.addNestedProcessGroups(StandardFlowSynchronizer.java:1333)
at
org.apache.nifi.controller.StandardFlowSynchronizer.addProcessGroup(StandardFlowSynchronizer.java:1322)
at
org.apache.nifi.controller.StandardFlowSynchronizer.addNestedProcessGroups(StandardFlowSynchronizer.java:1333)
at
org.apache.nifi.controller.StandardFlowSynchronizer.addProcessGroup(StandardFlowSynchronizer.java:1322)
at
org.apache.nifi.controller.StandardFlowSynchronizer.updateFlow(StandardFlowSynchronizer.java:432)
at
org.apache.nifi.controller.StandardFlowSynchronizer.sync(StandardFlowSynchronizer.java:283)
... 42 common frames omitted
{code}
was (Author: markap14):
Furthermore, it looks like if a Controller Service is referencing another
Controller Service, and that referenced service got disabled and deleted, NiFi
will fail to restart.
To replicate, create a Process Group, Group A. Within it, create nothing but a
child group, Group B.
Within Group B, create an AvroSchemaRegistry controller service, a CSV Reader,
and JSON Writer. Configure CSV Reader to use the Avro Schema Registry to get
the schema.
Create GenerateFlowFile -> ConvertRecord (using CSV Reader and JSON Writer) ->
(terminate)
Persist this flow to the registry. Then import the flow a second time.
On the newly imported flow, start all Controller Services, then start the
Processors.
Disable AvroSchemaRegistry service.
Delete AvroSchemaRegistry service.
Restart NiFi.
It will fail to startup with an error like the following:
{code:java}
2020-10-23 13:50:27,129 WARN [main] org.apache.nifi.web.server.JettyServer
Failed to start web server... shutting down.2020-10-23 13:50:27,129 WARN [main]
org.apache.nifi.web.server.JettyServer Failed to start web server... shutting
down.org.apache.nifi.controller.serialization.FlowSynchronizationException:
java.lang.NullPointerException at
org.apache.nifi.controller.StandardFlowSynchronizer.sync(StandardFlowSynchronizer.java:306)
at
org.apache.nifi.controller.FlowController.synchronize(FlowController.java:1420)
at
org.apache.nifi.persistence.StandardXMLFlowConfigurationDAO.load(StandardXMLFlowConfigurationDAO.java:89)
at
org.apache.nifi.controller.StandardFlowService.loadFromBytes(StandardFlowService.java:792)
at
org.apache.nifi.controller.StandardFlowService.load(StandardFlowService.java:537)
at
org.apache.nifi.web.contextlistener.ApplicationStartupContextListener.contextInitialized(ApplicationStartupContextListener.java:72)
at
org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:930)
at
org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:553)
at
org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:889)
at
org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:356)
at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1445)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1409)
at
org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:822)
at
org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:275)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:524) at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
at
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
at
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
at
org.eclipse.jetty.server.handler.gzip.GzipHandler.doStart(GzipHandler.java:425)
at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
at
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
at
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
at
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
at org.eclipse.jetty.server.Server.start(Server.java:407) at
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
at
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
at org.eclipse.jetty.server.Server.doStart(Server.java:371) at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
at org.apache.nifi.web.server.JettyServer.start(JettyServer.java:1054) at
org.apache.nifi.NiFi.<init>(NiFi.java:159) at
org.apache.nifi.NiFi.<init>(NiFi.java:71) at
org.apache.nifi.NiFi.main(NiFi.java:302)Caused by:
java.lang.NullPointerException: null at
org.apache.nifi.controller.service.StandardControllerServiceProvider.enableControllerServices(StandardControllerServiceProvider.java:192)
at
org.apache.nifi.controller.service.ControllerServiceLoader.enableControllerServices(ControllerServiceLoader.java:164)
at
org.apache.nifi.controller.service.ControllerServiceLoader.enableControllerServices(ControllerServiceLoader.java:152)
at
org.apache.nifi.controller.StandardFlowSynchronizer.addControllerServices(StandardFlowSynchronizer.java:1374)
at
org.apache.nifi.controller.StandardFlowSynchronizer.addProcessGroup(StandardFlowSynchronizer.java:1316)
at
org.apache.nifi.controller.StandardFlowSynchronizer.addNestedProcessGroups(StandardFlowSynchronizer.java:1333)
at
org.apache.nifi.controller.StandardFlowSynchronizer.addProcessGroup(StandardFlowSynchronizer.java:1322)
at
org.apache.nifi.controller.StandardFlowSynchronizer.addNestedProcessGroups(StandardFlowSynchronizer.java:1333)
at
org.apache.nifi.controller.StandardFlowSynchronizer.addProcessGroup(StandardFlowSynchronizer.java:1322)
at
org.apache.nifi.controller.StandardFlowSynchronizer.updateFlow(StandardFlowSynchronizer.java:432)
at
org.apache.nifi.controller.StandardFlowSynchronizer.sync(StandardFlowSynchronizer.java:283)
... 42 common frames omitted {code}
> When importing a flow from registry, Controller Service may lose track of
> Referencing Components
> ------------------------------------------------------------------------------------------------
>
> Key: NIFI-7944
> URL: https://issues.apache.org/jira/browse/NIFI-7944
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Reporter: Mark Payne
> Assignee: Mark Payne
> Priority: Major
>
> Consider a flow with a Process Group "A". Within Process Group A is a child
> Process Group, B. Process Group B has a Controller Service and has a
> Processor that references it.
> Save Process Group A into NiFi Registry.
> Import Process Group A into NiFi. Step into the Process Group and configure
> the child Process Group (Group B). Go to the Controller Services tab and
> configure the Controller Service. The service will not show the Processor as
> a Referencing component.
> This can result in a few different problems:
> * The Controller Service can be disabled while it's still being used.
> * If the Controller Service is enabled, along with all Referencing
> Components, those missing components won't show up.
> * The Controller Service can be deleted while it's still being referenced.
>
> This can lead to the following types of logs messages:
> {code:java}
> 2020-10-23 13:43:41,898 ERROR [Timer-Driven Process Thread-7]
> o.a.n.processors.standard.ConvertRecord
> ConvertRecord[id=b07355c2-8bd7-33a5-35b5-264ade413185] Failed to process
> StandardFlowFileRecord[uuid=824f5522-99d9-44cd-a685-eab697bdcf29,claim=StandardContentClaim
> [resourceClaim=StandardResourceClaim[id=1603475011829-1, container=default,
> section=1], offset=63,
> length=14],offset=0,name=824f5522-99d9-44cd-a685-eab697bdcf29,size=14]; will
> route to failure:
> org.apache.nifi.controller.service.ControllerServiceDisabledException: Cannot
> invoke method public abstract
> org.apache.nifi.serialization.record.RecordSchema
> org.apache.nifi.serialization.RecordSetWriterFactory.getSchema(java.util.Map,org.apache.nifi.serialization.record.RecordSchema)
> throws
> org.apache.nifi.schema.access.SchemaNotFoundException,java.io.IOException on
> Controller Service with identifier ca57bde0-517e-306a-ce46-10d6b8d24706
> because the Controller Service's State is currently DISABLED
> org.apache.nifi.controller.service.ControllerServiceDisabledException: Cannot
> invoke method public abstract
> org.apache.nifi.serialization.record.RecordSchema
> org.apache.nifi.serialization.RecordSetWriterFactory.getSchema(java.util.Map,org.apache.nifi.serialization.record.RecordSchema)
> throws
> org.apache.nifi.schema.access.SchemaNotFoundException,java.io.IOException on
> Controller Service with identifier ca57bde0-517e-306a-ce46-10d6b8d24706
> because the Controller Service's State is currently DISABLED
> at
> org.apache.nifi.controller.service.StandardControllerServiceInvocationHandler.invoke(StandardControllerServiceInvocationHandler.java:97)
> at com.sun.proxy.$Proxy139.getSchema(Unknown Source)
> at
> org.apache.nifi.processors.standard.AbstractRecordProcessor$1.process(AbstractRecordProcessor.java:149)
> at
> org.apache.nifi.controller.repository.StandardProcessSession.write(StandardProcessSession.java:2971)
> at
> org.apache.nifi.processors.standard.AbstractRecordProcessor.onTrigger(AbstractRecordProcessor.java:122)
> at
> org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
> at
> org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1173)
> at
> org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:213)
> at
> org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
> at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110)
> at
> java.util.concurrent.Executors$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$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> 2020-10-23 13:43:51,907 ERROR [Timer-Driven Process Thread-6]
> o.a.n.processors.standard.ConvertRecord
> ConvertRecord[id=b07355c2-8bd7-33a5-35b5-264ade413185] Failed to process
> StandardFlowFileRecord[uuid=597d9e36-3926-49d2-8f88-9200a917e29c,claim=StandardContentClaim
> [resourceClaim=StandardResourceClaim[id=1603475011829-1, container=default,
> section=1], offset=77,
> length=14],offset=0,name=597d9e36-3926-49d2-8f88-9200a917e29c,size=14]; will
> route to failure:
> org.apache.nifi.controller.service.ControllerServiceDisabledException: Cannot
> invoke method public abstract
> org.apache.nifi.serialization.record.RecordSchema
> org.apache.nifi.serialization.RecordSetWriterFactory.getSchema(java.util.Map,org.apache.nifi.serialization.record.RecordSchema)
> throws
> org.apache.nifi.schema.access.SchemaNotFoundException,java.io.IOException on
> Controller Service with identifier ca57bde0-517e-306a-ce46-10d6b8d24706
> because the Controller Service's State is currently DISABLED
> org.apache.nifi.controller.service.ControllerServiceDisabledException: Cannot
> invoke method public abstract
> org.apache.nifi.serialization.record.RecordSchema
> org.apache.nifi.serialization.RecordSetWriterFactory.getSchema(java.util.Map,org.apache.nifi.serialization.record.RecordSchema)
> throws
> org.apache.nifi.schema.access.SchemaNotFoundException,java.io.IOException on
> Controller Service with identifier ca57bde0-517e-306a-ce46-10d6b8d24706
> because the Controller Service's State is currently DISABLED
> at
> org.apache.nifi.controller.service.StandardControllerServiceInvocationHandler.invoke(StandardControllerServiceInvocationHandler.java:97)
> at com.sun.proxy.$Proxy139.getSchema(Unknown Source)
> at
> org.apache.nifi.processors.standard.AbstractRecordProcessor$1.process(AbstractRecordProcessor.java:149)
> at
> org.apache.nifi.controller.repository.StandardProcessSession.write(StandardProcessSession.java:2971)
> at
> org.apache.nifi.processors.standard.AbstractRecordProcessor.onTrigger(AbstractRecordProcessor.java:122)
> at
> org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
> at
> org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1173)
> at
> org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:213)
> at
> org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
> at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110)
> at
> java.util.concurrent.Executors$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)
> 2020-10-23 13:44:01,900 ERROR [Timer-Driven Process Thread-3]
> o.a.n.processors.standard.ConvertRecord
> ConvertRecord[id=b07355c2-8bd7-33a5-35b5-264ade413185] Failed to process
> StandardFlowFileRecord[uuid=0d71b72b-db77-4175-9deb-5f9290ea9d60,claim=StandardContentClaim
> [resourceClaim=StandardResourceClaim[id=1603475011829-1, container=default,
> section=1], offset=91,
> length=14],offset=0,name=0d71b72b-db77-4175-9deb-5f9290ea9d60,size=14]; will
> route to failure: java.lang.NullPointerException
> java.lang.NullPointerException: null
> at
> org.apache.nifi.processors.standard.AbstractRecordProcessor$1.process(AbstractRecordProcessor.java:149)
> at
> org.apache.nifi.controller.repository.StandardProcessSession.write(StandardProcessSession.java:2971)
> at
> org.apache.nifi.processors.standard.AbstractRecordProcessor.onTrigger(AbstractRecordProcessor.java:122)
> at
> org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
> at
> org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1173)
> at
> org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:213)
> at
> org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
> at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110)
> at
> java.util.concurrent.Executors$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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