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Deadlocks in the JBPM4_EXECUTION
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created by <a href="http://community.jboss.org/people/sacrm2011">sacrm2011</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/642318#642318">View the full discussion</a>
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<div class="jive-rendered-content"><p> Hello</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I'm having some problems with jBPM4.4.</p><p>My application is currently running on a 3-node cluster using an oracle database 11.2.0.2.0 and am using JBPM 4.4 as an orchestrator of the flow of navigation of the application.</p><p>At the beginning my application had  some problems with competition but not as severe as today, since the load has been increase significantly.</p><p>I'm getting a lot of error messages in my logs:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>"2011-12-15 11:00:26,933 ERROR [org.hibernate.util.JDBCExceptionReporter] -  ORA-00060: deadlock detected while waiting for resource</p><p>2011-12-15 11:00:26,934 ERROR [org.hibernate.event.def.AbstractFlushingEventListener] -  Could not synchronize database state with session </p><p>org.hibernate.exception.LockAcquisitionException: could not delete: [org.jbpm.pvm.internal.model.ExecutionImpl#20376624]</p><p>    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:110)</p><p>    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)</p><p>    at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2569)</p><p>    at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2725)</p><p>    at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:97)</p><p>    at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)</p><p>    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)</p><p>    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:172)</p><p>    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)</p><p>    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)</p><p>    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)</p><p>    at org.jbpm.pvm.internal.tx.HibernateSessionResource.prepare(HibernateSessionResource.java:56)</p><p>    at org.jbpm.pvm.internal.tx.StandardTransaction.commit(StandardTransaction.java:107)</p><p>    at org.jbpm.pvm.internal.tx.StandardTransaction.complete(StandardTransaction.java:64)</p><p>    at org.jbpm.pvm.internal.tx.StandardTransactionInterceptor.execute(StandardTransactionInterceptor.java:57)</p><p>    at org.jbpm.pvm.internal.svc.EnvironmentInterceptor.executeInNewEnvironment(EnvironmentInterceptor.java:53)</p><p>    at org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:40)</p><p>    at org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:56)</p><p>    at org.jbpm.pvm.internal.svc.SkipInterceptor.execute(SkipInterceptor.java:43)</p><p>    at org.jbpm.pvm.internal.svc.ExecutionServiceImpl.signalExecutionById(ExecutionServiceImpl.java:89)</p><p>    (...) "</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Looking in database logs found several sql statements/threads that I suspect are causing the deadlocks:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Query 1:</p><p>"delete from where JBPM4_EXECUTION DBID_ =: = 1 and DBVERSION_: 2;"</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Query 2:</p><p>"update JBPM4_EXECUTION set </p><p>        DBVERSION_=:1, ACTIVITYNAME_=:2, PROCDEFID_=:3, HASVARS_=:4, NAME_=:5, KEY_=:6, ID_=:7, STATE_=:8, SUSPHISTSTATE_=:9, </p><p>        PRIORITY_=:10, HISACTINST_=:11, PARENT_=:12, INSTANCE_=:13, SUPEREXEC_=:14, SUBPROCINST_=:15 </p><p> where DBID_=:16 and DBVERSION_=:17; "</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Is this a concurrencial problem/limitation of jbpm or something else?</p><p>Any help would be greatly appreciated! </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Best regards</p><p>Afonso T.</p></div>
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