We can see "IllegalStateException: AtomicMap stored under key X has been concurrently removed!" warning message in the server logs in our failover tests with invalidation cache and shared cache store. Scenario description: HTTP traffic accessing clustered web application that has replicated sessions (uses a mod_cluster load balancer). Delay between sending a new request after receiving a response is 1000 ms (for each client). Session size is 34 KB. 4-node EAP cluster + 4-node JDG cluster, one EAP node at time is shut down and after some time started again, while 6000 standalone clients keep calling the application. Configuration: - 4-node EAP cluster with an invalidation cache + a shared cache store (remote JDG cluster) - 4-node JDG cluster with distributed cache - 4 nodes generating load (6000 clients in total) - cache mode: ASYNC (for both invalidation and distributed caches, also "write-behind" element is set for "remote-store" element accordingly) Links to configuration files: EAP http://jenkins.mw.lab.eng.bos.redhat.com/hudson/job/eap-6x-stressfailover-remote-jdg-session-shutdown-invalidation-async-4nodes-perf17/4/artifact/report/config/jboss-perf18/standalone-ha.xml JDG http://jenkins.mw.lab.eng.bos.redhat.com/hudson/job/eap-6x-stressfailover-remote-jdg-session-shutdown-invalidation-async-4nodes-perf17/4/artifact/report/config/jboss-perf22/clustered.xml When EAP server perf19 was shutdown, other servers received a new cluster view and started logging these warning few seconds after: [JBossINF] [0m[33m22:15:59,287 WARN [org.jboss.as.clustering.web.infinispan] (ajp-perf20/10.16.90.58:8009-2818) JBAS010322: Failed to load session -dttfB3ao4J2kK0ezrJxEilR: java.lang.IllegalStateException: AtomicMap stored under key -dttfB3ao4J2kK0ezrJxEilR has been concurrently removed! [JBossINF] at org.infinispan.atomic.AtomicHashMapProxy.assertValid(AtomicHashMapProxy.java:149) [infinispan-core-5.2.18.Final-redhat-1.jar:5.2.18.Final-redhat-1] [JBossINF] at org.infinispan.atomic.AtomicHashMapProxy.getDeltaMapForRead(AtomicHashMapProxy.java:92) [infinispan-core-5.2.18.Final-redhat-1.jar:5.2.18.Final-redhat-1] [JBossINF] at org.infinispan.atomic.AtomicHashMapProxy.get(AtomicHashMapProxy.java:197) [infinispan-core-5.2.18.Final-redhat-1.jar:5.2.18.Final-redhat-1] [JBossINF] at org.jboss.as.clustering.web.infinispan.SessionMapEntry.get(SessionMapEntry.java:51) [JBossINF] at org.jboss.as.clustering.web.infinispan.DistributedCacheManager$2.invoke(DistributedCacheManager.java:220) [JBossINF] at org.jboss.as.clustering.web.infinispan.DistributedCacheManager$2.invoke(DistributedCacheManager.java:212) [JBossINF] at org.jboss.as.clustering.infinispan.invoker.SimpleCacheInvoker.invoke(SimpleCacheInvoker.java:34) [JBossINF] at org.jboss.as.clustering.infinispan.invoker.BatchCacheInvoker.invoke(BatchCacheInvoker.java:48) [JBossINF] at org.jboss.as.clustering.infinispan.invoker.RetryingCacheInvoker.invoke(RetryingCacheInvoker.java:85) [JBossINF] at org.jboss.as.clustering.web.infinispan.DistributedCacheManager$ForceSynchronousCacheInvoker.invoke(DistributedCacheManager.java:550) [JBossINF] at org.jboss.as.clustering.web.infinispan.DistributedCacheManager.getData(DistributedCacheManager.java:238) [JBossINF] at org.jboss.as.clustering.web.infinispan.DistributedCacheManager.getSessionData(DistributedCacheManager.java:196) [JBossINF] at org.jboss.as.web.session.ClusteredSession.acquireSessionOwnership(ClusteredSession.java:521) [jboss-as-web-7.5.8.Final-redhat-2-bz-1370648.jar:7.5.8.Final-redhat-SNAPSHOT] [JBossINF] at org.jboss.as.web.session.ClusteredSession.access(ClusteredSession.java:488) [jboss-as-web-7.5.8.Final-redhat-2-bz-1370648.jar:7.5.8.Final-redhat-SNAPSHOT] [JBossINF] at org.apache.catalina.connector.Request.doGetSession(Request.java:2638) [jbossweb-7.5.16.Final-redhat-1.jar:7.5.16.Final-redhat-1] [JBossINF] at org.apache.catalina.connector.Request.getSession(Request.java:2382) [jbossweb-7.5.16.Final-redhat-1.jar:7.5.16.Final-redhat-1] [JBossINF] at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:791) [jbossweb-7.5.16.Final-redhat-1.jar:7.5.16.Final-redhat-1] [JBossINF] at org.jboss.weld.context.beanstore.http.LazySessionBeanStore.getSession(LazySessionBeanStore.java:73) [weld-core-1.1.33.Final-redhat-1.jar:1.1.33.Final-redhat-1] [JBossINF] at org.jboss.weld.context.beanstore.http.LazySessionBeanStore.<init>(LazySessionBeanStore.java:59) [weld-core-1.1.33.Final-redhat-1.jar:1.1.33.Final-redhat-1] [JBossINF] at org.jboss.weld.context.http.HttpSessionContextImpl.associate(HttpSessionContextImpl.java:39) [weld-core-1.1.33.Final-redhat-1.jar:1.1.33.Final-redhat-1] [JBossINF] at org.jboss.weld.context.http.HttpSessionContextImpl.associate(HttpSessionContextImpl.java:22) [weld-core-1.1.33.Final-redhat-1.jar:1.1.33.Final-redhat-1] [JBossINF] at org.jboss.weld.servlet.WeldListener.requestInitialized(WeldListener.java:212) [weld-core-1.1.33.Final-redhat-1.jar:1.1.33.Final-redhat-1] [JBossINF] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [jbossweb-7.5.16.Final-redhat-1.jar:7.5.16.Final-redhat-1] [JBossINF] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.5.16.Final-redhat-1.jar:7.5.16.Final-redhat-1] [JBossINF] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.5.16.Final-redhat-1.jar:7.5.16.Final-redhat-1] [JBossINF] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) [jbossweb-7.5.16.Final-redhat-1.jar:7.5.16.Final-redhat-1] [JBossINF] at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:490) [jbossweb-7.5.16.Final-redhat-1.jar:7.5.16.Final-redhat-1] [JBossINF] at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:420) [jbossweb-7.5.16.Final-redhat-1.jar:7.5.16.Final-redhat-1] [JBossINF] at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926) [jbossweb-7.5.16.Final-redhat-1.jar:7.5.16.Final-redhat-1] [JBossINF] at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_91] Link to server log: http://jenkins.mw.lab.eng.bos.redhat.com/hudson/job/eap-6x-stressfailover-remote-jdg-session-shutdown-invalidation-async-4nodes-perf17/4/console-perf20/
After further investigation, this seems as a duplicate of https://bugzilla.redhat.com/show_bug.cgi?id=922699