Database Timers: instances sporadically fail to start in a cluster ------------------------------------------------------------------ Key: WFLY-13438 URL: https://issues.redhat.com/browse/WFLY-13438 Project: WildFly Issue Type: Bug Components: EJB Affects Versions: 19.1.0.Final Reporter: Marcos Scholtz Assignee: Cheng Fang Priority: Major We use a postgresql database for persistent timers, to control the execution of scheduled tasks in a cluster. It mainly works, but when operating in a cluster and when a server-group is restarted, sometimes individual instances in the cluster fail to start because of an error when reinstating persistent timers. Configuration of the Datasource: {code} <xa-datasource jndi-name="java:/datasources/MonitoringDS" pool-name="MonitoringDS" enabled="true"> <xa-datasource-property name="ServerName"> appserver.local </xa-datasource-property> <xa-datasource-property name="PortNumber"> 5432 </xa-datasource-property> <xa-datasource-property name="DatabaseName"> monitoringdb </xa-datasource-property> <xa-datasource-class>org.postgresql.xa.PGXADataSource</xa-datasource-class> <driver>postgresql</driver> <security> <user-name>xxx</user-name> <password>xxx</password> </security> </xa-datasource> {code} Configuration of the timer service: {code} <timer-service thread-pool-name="default" default-data-store="batch-clustered-store"> <data-stores> <file-data-store name="default-file-store" path="timer-service-data" relative-to="jboss.server.data.dir"/> <database-data-store name="batch-clustered-store" datasource-jndi-name="java:/datasources/MonitoringDS" database="'postgresql'" partition="${batch.partition}" refresh-interval="60000" allow-execution="true"/> </data-stores> </timer-service> {code} Note we use a system-property on the server-group to determine the partition name. Also, we made NO changes to the SQL statements in "timer-sql.properties". The timer is generated by a `@Schedule` annotation in an EJB like this: {code} @Schedule( dayOfMonth = "${manual.scheduler.dayofmonth:*}", dayOfWeek = "${manual.scheduler.dayofweek:*}", hour = "${manual.scheduler.hour:2/6}", minute = "${manual.scheduler.minute:2}" ) @TransactionAttribute(TransactionAttributeType.NEVER) void doPostboxImport() { log.info("Starting Postbox Import"); BatchRuntime.getJobOperator().start("PostboxImportBatchlet", null); } {code} The error we sporadically get when starting more than one instance at the same time (when all instances try to reinstate timers) is like this: {code} 14:48:28,117 WARN [com.arjuna.ats.arjuna] (ServerService Thread Pool -- 69) {"tenant": "", "clientId": ""} ARJUNA012078: Abort called illegaly on atomic action 0:ffff7f000001:-27f2652e:5eb2b20f:f 14:48:28,118 WARN [org.jboss.as.ejb3.timer] (ServerService Thread Pool -- 69) {"tenant": "", "clientId": ""} WFLYEJB0161: Failed to reinstate timer 'postbox-integration-service.postbox-integration-service.PostboxImport' (id=unavailable) from its persistent state: javax.transaction.NotSupportedException: WFTXN0001: A transaction is already in progress at org.wildfly.transaction.client@1.1.9.Final//org.wildfly.transaction.client.ContextTransactionManager.begin(ContextTransactionManager.java:60) at org.wildfly.transaction.client@1.1.9.Final//org.wildfly.transaction.client.ContextTransactionManager.begin(ContextTransactionManager.java:54) at org.jboss.as.ejb3@19.1.0.Final//org.jboss.as.ejb3.timerservice.TimerServiceImpl.getActivePersistentTimers(TimerServiceImpl.java:984) at org.jboss.as.ejb3@19.1.0.Final//org.jboss.as.ejb3.timerservice.TimerServiceImpl.restoreTimers(TimerServiceImpl.java:712) at org.jboss.as.ejb3@19.1.0.Final//org.jboss.as.ejb3.timerservice.TimerServiceImpl.activate(TimerServiceImpl.java:223) at org.jboss.as.ejb3@19.1.0.Final//org.jboss.as.ejb3.component.EJBComponent.init(EJBComponent.java:595) at org.jboss.as.ejb3@19.1.0.Final//org.jboss.as.ejb3.component.stateless.StatelessSessionComponent.init(StatelessSessionComponent.java:110) at org.jboss.as.ee@19.1.0.Final//org.jboss.as.ee.component.BasicComponent.start(BasicComponent.java:222) at org.jboss.as.ee@19.1.0.Final//org.jboss.as.ee.component.ComponentStartService$1.run(ComponentStartService.java:54) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.jboss.threads@2.3.3.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) at org.jboss.threads@2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1982) at org.jboss.threads@2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486) at org.jboss.threads@2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377) at java.base/java.lang.Thread.run(Thread.java:834) at org.jboss.threads@2.3.3.Final//org.jboss.threads.JBossThread.run(JBossThread.java:485) 14:48:28,153 ERROR [org.jboss.msc.service.fail] (ServerService Thread Pool -- 69) {"tenant": "", "clientId": ""} MSC000001: Failed to start service jboss.deployment.unit."postbox-integration-service-E-SNAPSHOT.war".component.PostboxImport.START: org.jboss.msc.service.StartException in service jboss.deployment.unit."postbox-integration-service-E-SNAPSHOT.war".component.PostboxImport.START: java.lang.RuntimeException: java.lang.NullPointerException at org.jboss.as.ee@19.1.0.Final//org.jboss.as.ee.component.ComponentStartService$1.run(ComponentStartService.java:57) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.jboss.threads@2.3.3.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) at org.jboss.threads@2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1982) at org.jboss.threads@2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486) at org.jboss.threads@2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377) at java.base/java.lang.Thread.run(Thread.java:834) at org.jboss.threads@2.3.3.Final//org.jboss.threads.JBossThread.run(JBossThread.java:485) Caused by: java.lang.RuntimeException: java.lang.NullPointerException at org.jboss.as.ejb3@19.1.0.Final//org.jboss.as.ejb3.timerservice.TimerServiceImpl.persistTimer(TimerServiceImpl.java:626) at org.jboss.as.ejb3@19.1.0.Final//org.jboss.as.ejb3.timerservice.TimerServiceImpl.createCalendarTimer(TimerServiceImpl.java:537) at org.jboss.as.ejb3@19.1.0.Final//org.jboss.as.ejb3.timerservice.TimerServiceImpl.loadAutoTimer(TimerServiceImpl.java:388) at org.jboss.as.ejb3@19.1.0.Final//org.jboss.as.ejb3.timerservice.TimerServiceImpl.restoreTimers(TimerServiceImpl.java:774) at org.jboss.as.ejb3@19.1.0.Final//org.jboss.as.ejb3.timerservice.TimerServiceImpl.activate(TimerServiceImpl.java:223) at org.jboss.as.ejb3@19.1.0.Final//org.jboss.as.ejb3.component.EJBComponent.init(EJBComponent.java:595) at org.jboss.as.ejb3@19.1.0.Final//org.jboss.as.ejb3.component.stateless.StatelessSessionComponent.init(StatelessSessionComponent.java:110) at org.jboss.as.ee@19.1.0.Final//org.jboss.as.ee.component.BasicComponent.start(BasicComponent.java:222) at org.jboss.as.ee@19.1.0.Final//org.jboss.as.ee.component.ComponentStartService$1.run(ComponentStartService.java:54) ... 8 more Caused by: java.lang.NullPointerException at org.jboss.as.ejb3@19.1.0.Final//org.jboss.as.ejb3.timerservice.persistence.database.DatabaseTimerPersistence.addTimer(DatabaseTimerPersistence.java:336) at org.jboss.as.ejb3@19.1.0.Final//org.jboss.as.ejb3.timerservice.TimerServiceImpl.persistTimer(TimerServiceImpl.java:607) ... 16 more {code} The error seems similar to the one described in WFLY-13386, but the stack trace and the steps to reproduce it seem different to me, so I'm not sure if it's the same problem. The problem also existed in Wildfly 14 , we just updated to 19.1 (also hoping that his error would be corrected).