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  1. JBoss Enterprise Application Platform
  2. JBEAP-22185

[GSS](7.4.z) Session objects left in memory after non-coordinator member left a cluster

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      I am aware there is issue when coordinator change some sessions could be orphaned JBEAP-22064. So I am trying to simulate similar scaleup/scaledown during load performed, in way coordinator stay the same.
      I am doing this on OpenShift because scaleup/scaledown is easy there. But I don't think it is Openshift specific and that it would be possible to simulate on bare metal as well.

      1. startup 1 node and generate load of 100 sessions
      2. scaleup 2nd node and generate load of 100 sessions
      3. scaleup 3rd node and generate load of 100 sessions
      4. scaleup 4th node and generate load of 100 sessions
      5. scaledown to 3 nodes and generate load of 100 sessions
      6. scaledown to 2 nodes and generate load of 100 sessions
      

      In that moment I stopped generating load and wait for all sessions expired. There is no session.invalidate() code and all sessions are relying on beeing expired.

      After an hour (session timeout is 1 minute) both running pods shows these session objects in heap

      Sat Jun 12 00:02:30 JST 2021
      PID: 942
      # before GC --------------------------
       num #instances #bytes class name (module)
       602: 55 1320 org.wildfly.clustering.web.infinispan.session.fine.SessionAttributeKey
      --------------------------------------
      # trigger GC to clean up for testing purpose 
      942:
      Command executed successfully
      # after GC ---------------------------
       num #instances #bytes class name (module)
       584: 55 1320 org.wildfly.clustering.web.infinispan.session.fine.SessionAttributeKey
      --------------------------------------
      

      For whole time `globalmenu-pl-pc-green-28-sq7ns` was coordinator of cluster, so this is different case than JBEAP-22064. When pod `globalmenu-pl-pc-green-28-5ptjz` was finishing there occured this exception in log

      ERROR *** JBossAS wrapper process (1) received TERM signal ***
      23:44:45,586 INFO [org.infinispan.remoting.transport.jgroups.JGroupsTransport] (MSC service thread 1-6) ISPN000080: Disconnecting JGroups channel ee
      23:44:45,588 INFO [org.jboss.as.mail.extension] (MSC service thread 1-1) WFLYMAIL0002: Unbound mail session [java:jboss/mail/Default]
      23:44:45,589 INFO [org.infinispan.remoting.transport.jgroups.JGroupsTransport] (MSC service thread 1-2) ISPN000080: Disconnecting JGroups channel ee
      23:44:45,590 INFO [org.wildfly.extension.undertow] (ServerService Thread Pool -- 87) WFLYUT0022: Unregistered web context: '/globalmenu-pl-pc' from server 'default-server'
      23:44:45,598 INFO [org.wildfly.extension.messaging-activemq] (ServerService Thread Pool -- 7) WFLYMSGAMQ0006: Unbound messaging object to jndi name java:jboss/exported/jms/RemoteConnectionFactory
      23:44:45,634 DEBUG [org.jboss.as.clustering.infinispan] (MSC service thread 1-6) hibernate cache container stopped
      23:44:45,635 DEBUG [org.jboss.as.clustering.infinispan] (MSC service thread 1-2) server cache container stopped
      23:44:45,713 INFO [org.wildfly.extension.undertow] (MSC service thread 1-3) WFLYUT0019: Host default-host stopping
      23:44:45,730 INFO [org.jboss.as.connector.deployment] (MSC service thread 1-6) WFLYJCA0119: Unbinding connection factory named java:/JmsXA to alias java:jboss/DefaultJMSConnectionFactory
      23:44:45,730 INFO [org.jboss.as.connector.deployment] (MSC service thread 1-6) WFLYJCA0011: Unbound JCA ConnectionFactory [java:/JmsXA]
      23:44:45,800 INFO [org.jboss.modcluster] (ServerService Thread Pool -- 90) MODCLUSTER000002: Initiating mod_cluster shutdown
      23:44:45,822 INFO [org.jboss.as.clustering.infinispan] (ServerService Thread Pool -- 98) WFLYCLINF0003: Stopped client-mappings cache from ejb container
      23:44:45,824 WARN [org.wildfly.clustering.web.infinispan] (SessionExpirationScheduler - 1) WFLYCLWEBINF0004: Failed to expire session ZsIW17pCm80VKA3PEZIu6f8_GGsomCeHATYtvjMfp5b2afw_: org.infinispan.IllegalLifecycleStateException: ISPN000324: Cache 'globalmenu-pl-pc.war' is in 'STOPPING' state and this is an invocation not belonging to an on-going transaction, so it does not accept new invocations. Either restart it or recreate the cache container.
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.interceptors.impl.InvocationContextInterceptor.ignoreCommand(InvocationContextInterceptor.java:101)
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.interceptors.impl.InvocationContextInterceptor.visitCommand(InvocationContextInterceptor.java:87)
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.interceptors.BaseAsyncInterceptor.invokeNext(BaseAsyncInterceptor.java:57)
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.interceptors.DDAsyncInterceptor.handleDefault(DDAsyncInterceptor.java:54)
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.interceptors.DDAsyncInterceptor.visitRemoveCommand(DDAsyncInterceptor.java:65)
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.commands.write.RemoveCommand.acceptVisitor(RemoveCommand.java:64)
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.interceptors.DDAsyncInterceptor.visitCommand(DDAsyncInterceptor.java:50)
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.interceptors.impl.AsyncInterceptorChainImpl.invoke(AsyncInterceptorChainImpl.java:248)
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.cache.impl.CacheImpl.executeCommandAndCommitIfNeeded(CacheImpl.java:1915)
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.cache.impl.CacheImpl.remove(CacheImpl.java:680)
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.cache.impl.DecoratedCache.remove(DecoratedCache.java:559)
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.cache.impl.AbstractDelegatingCache.remove(AbstractDelegatingCache.java:453)
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.cache.impl.EncoderCache.remove(EncoderCache.java:684)
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.cache.impl.AbstractDelegatingCache.remove(AbstractDelegatingCache.java:453)
       at org.wildfly.clustering.web.infinispan@7.3.5.GA-redhat-00001//org.wildfly.clustering.web.infinispan.session.fine.FineSessionAttributesFactory.delete(FineSessionAttributesFactory.java:139)
       at org.wildfly.clustering.web.infinispan@7.3.5.GA-redhat-00001//org.wildfly.clustering.web.infinispan.session.fine.FineSessionAttributesFactory.remove(FineSessionAttributesFactory.java:127)
       at org.wildfly.clustering.web.infinispan@7.3.5.GA-redhat-00001//org.wildfly.clustering.web.infinispan.session.fine.FineSessionAttributesFactory.remove(FineSessionAttributesFactory.java:66)
       at org.wildfly.clustering.web.cache@7.3.5.GA-redhat-00001//org.wildfly.clustering.web.cache.session.CompositeSessionFactory.remove(CompositeSessionFactory.java:89)
       at org.wildfly.clustering.web.cache@7.3.5.GA-redhat-00001//org.wildfly.clustering.web.cache.session.CompositeSessionFactory.remove(CompositeSessionFactory.java:39)
       at org.wildfly.clustering.web.infinispan@7.3.5.GA-redhat-00001//org.wildfly.clustering.web.infinispan.session.ExpiredSessionRemover.remove(ExpiredSessionRemover.java:65)
       at org.wildfly.clustering.web.infinispan@7.3.5.GA-redhat-00001//org.wildfly.clustering.web.infinispan.session.ExpiredSessionRemover.remove(ExpiredSessionRemover.java:41)
       at org.wildfly.clustering.web.infinispan@7.3.5.GA-redhat-00001//org.wildfly.clustering.web.infinispan.session.SessionExpirationScheduler$ExpirationTask.run(SessionExpirationScheduler.java:165)
       at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
       at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
       at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
       at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
       at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
       at java.base/java.lang.Thread.run(Thread.java:834)
       at org.jboss.threads@2.3.3.Final-redhat-00001//org.jboss.threads.JBossThread.run(JBossThread.java:485)
       Suppressed: org.infinispan.util.logging.TraceException
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.interceptors.impl.SimpleAsyncInvocationStage.get(SimpleAsyncInvocationStage.java:41)
       at org.infinispan@9.4.19.Final-redhat-00001//org.infinispan.interceptors.impl.AsyncInterceptorChainImpl.invoke(AsyncInterceptorChainImpl.java:250)
       ... 21 more
      

      Btw. I tried also just 5x scaleup (no scaledown) and there were some sessions orpaned. But I am not sure if in that case there was not coordinator change, which would be case of JBEAP-22064 actually. I will continue with this investigation as well.

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              pferraro@redhat.com Paul Ferraro
              pferraro@redhat.com Paul Ferraro
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