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https://issues.apache.org/jira/browse/FALCON-1568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14980155#comment-14980155
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pavan kumar kolamuri commented on FALCON-1568:
----------------------------------------------
The issue is because , even though synchronized list for listeners is being
used in JobCompletionService . While iterating that list it should in
synchronized block which was missing.
> Process Instances are not getting scheduled in Falcon Native Scheduler
> -----------------------------------------------------------------------
>
> Key: FALCON-1568
> URL: https://issues.apache.org/jira/browse/FALCON-1568
> Project: Falcon
> Issue Type: Bug
> Reporter: pavan kumar kolamuri
> Assignee: pavan kumar kolamuri
>
> If process is scheduled using Falcon Native Scheduler some instances are not
> getting scheduled as JobCompletionService is failing concurrent modification
> exception.
> {noformat}
> java.util.ConcurrentModificationException
> at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859)
> at java.util.ArrayList$Itr.next(ArrayList.java:831)
> at
> org.apache.falcon.notification.service.impl.JobCompletionService.onEnd(JobCompletionService.java:145)
> at
> org.apache.falcon.notification.service.impl.JobCompletionService.onSuccess(JobCompletionService.java:120)
> at
> org.apache.falcon.workflow.WorkflowJobEndNotificationService.notifyWorkflowEnd(WorkflowJobEndNotificationService.java:235)
> at
> org.apache.falcon.workflow.WorkflowJobEndNotificationService.notifySuccess(WorkflowJobEndNotificationService.java:105)
> at
> org.apache.falcon.messaging.JMSMessageConsumer.invokeListener(JMSMessageConsumer.java:197)
> at
> org.apache.falcon.messaging.JMSMessageConsumer.onMessage(JMSMessageConsumer.java:120)
> at
> org.apache.activemq.ActiveMQMessageConsumer.dispatch(ActiveMQMessageConsumer.java:1393)
> at
> org.apache.activemq.ActiveMQSessionExecutor.dispatch(ActiveMQSessionExecutor.java:131)
> at
> org.apache.activemq.ActiveMQSessionExecutor.iterate(ActiveMQSessionExecutor.java:202)
> at
> org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:133)
> at
> org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:48)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
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