James, I suggest you file this bug against EclipseLink as well.
Shanti On 4/6/10 10:51 AM, James Zubb (JIRA) wrote:
[ https://issues.apache.org/jira/browse/OLIO-144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] James Zubb updated OLIO-144: ---------------------------- Environment: CentOS 5.3 4GB RAM 4vCPU ESX 4 Glassfish 2.2.1, JDK 1.6U18 Eclipselink 1.1.3 400 user load was: CentOS 5.3 4GB RAM 4vCPU ESX 4 Glassfish 2.2.1, JDK 1.6U18 Eclipselink 1.1.3Encounter Eclipselink ConcurrencyException under heavy load ----------------------------------------------------------- Key: OLIO-144 URL: https://issues.apache.org/jira/browse/OLIO-144 Project: Olio Issue Type: Bug Components: java-app Affects Versions: 0.2 Environment: CentOS 5.3 4GB RAM 4vCPU ESX 4 Glassfish 2.2.1, JDK 1.6U18 Eclipselink 1.1.3 400 user load Reporter: James Zubb Assignee: Shanti Subramanyam I have been seeing eclipselink concurrencyexception when the system is under heavy load. Once the exception occurs the entire app hangs. Here is the exception: [#|2010-02-10T16:15:10.003-0800|WARNING|sun-appserver2.1|org.eclipse.persistence.session.file:/opt/glassfish/domains/domain1/applications/j2ee-modules/webapp/WEB-INF/classes/-BPWebappPu|_ThreadID=16;_ThreadName=httpSSLWorkerThread-8080-0;_RequestID=57c0781d-255f-4f9e-9ccf-41a5c296befe;| Local Exception Stack: Exception [EclipseLink-2004] (Eclipse Persistence Services - 1.1.3.v20091002-r5404): org.eclipse.persistence.exceptions.ConcurrencyException Exception Description: A signal was attempted before wait() on ConcurrencyManager. This normally means that an attempt was made to commit or rollback a transaction before it was started, or to rollback a transaction twice. at org.eclipse.persistence.exceptions.ConcurrencyException.signalAttemptedBeforeWait(ConcurrencyException.java:84) at org.eclipse.persistence.internal.helper.ConcurrencyManager.releaseReadLock(ConcurrencyManager.java:478) at org.eclipse.persistence.internal.identitymaps.CacheKey.releaseReadLock(CacheKey.java:433) at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.cloneAndRegisterObject(UnitOfWorkImpl.java:939) at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.cloneAndRegisterObject(UnitOfWorkImpl.java:833) at org.eclipse.persistence.internal.sessions.UnitOfWorkIdentityMapAccessor.getAndCloneCacheKeyFromParent(UnitOfWorkIdentityMapAccessor.java:171) at org.eclipse.persistence.internal.sessions.UnitOfWorkIdentityMapAccessor.getFromIdentityMap(UnitOfWorkIdentityMapAccessor.java:110) at org.eclipse.persistence.internal.sessions.IdentityMapAccessor.getFromIdentityMap(IdentityMapAccessor.java:327) at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.registerExistingObject(UnitOfWorkImpl.java:3776) at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.registerExistingObject(UnitOfWorkImpl.java:3736) at org.eclipse.persistence.queries.ObjectBuildingQuery.registerIndividualResult(ObjectBuildingQuery.java:362) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildWorkingCopyCloneNormally(ObjectBuilder.java:582) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInUnitOfWork(ObjectBuilder.java:544) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:485) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:437) at org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:569) at org.eclipse.persistence.queries.ReadAllQuery.registerResultInUnitOfWork(ReadAllQuery.java:904) at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:490) at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:928) at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:664) at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:889) at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:458) at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:952) at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2750) at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1181) at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1165) at org.eclipse.persistence.internal.indirection.QueryBasedValueHolder.instantiate(QueryBasedValueHolder.java:81) at org.eclipse.persistence.internal.indirection.QueryBasedValueHolder.instantiate(QueryBasedValueHolder.java:71) at org.eclipse.persistence.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:83) at org.eclipse.persistence.internal.indirection.UnitOfWorkValueHolder.instantiateImpl(UnitOfWorkValueHolder.java:161) at org.eclipse.persistence.internal.indirection.UnitOfWorkValueHolder.instantiate(UnitOfWorkValueHolder.java:230) at org.eclipse.persistence.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:83) at org.eclipse.persistence.indirection.IndirectList.buildDelegate(IndirectList.java:220) at org.eclipse.persistence.indirection.IndirectList.getDelegate(IndirectList.java:386) at org.eclipse.persistence.indirection.IndirectList$1.<init>(IndirectList.java:514) at org.eclipse.persistence.indirection.IndirectList.listIterator(IndirectList.java:513) at org.eclipse.persistence.indirection.IndirectList.iterator(IndirectList.java:477) at org.apache.olio.webapp.model.ModelFacade.getSocialEvent(ModelFacade.java:583) at org.apache.olio.webapp.controller.EventAction.process(EventAction.java:71) at org.apache.olio.webapp.controller.ControllerServlet.process(ControllerServlet.java:61) at org.apache.olio.webapp.controller.ControllerServlet.doGet(ControllerServlet.java:93) at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:315) at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94) at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:291) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:666) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:597) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:872) at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341) at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:263) at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:214) at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:264) at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106) |#] The culprit is the comments. I modified the allocation size of the CommentsRating table to 50000 (it is currently set at 20000) and it appears to fix this. I have also encountered this problem using Eclipselink 2.0 on Glassfish 2.2.1, I haven't tried Glassfish 3.
