Infinispan acquireSessionOwnership contention with distributed cache

Solution Unverified - Updated -

Issue

  • Many ajp threads waiting to acquire session ownership with a stack trace as follows:
  • Corresponding Server log will also show the Exceptions as below.
ajp-ABC/1.2.3.4:8009-123" daemon prio=10 tid=0x00007fdae6491800 nid=0x7a07 waiting on condition [0x00007fda7b937000]
       java.lang.Thread.State: WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x00000006a018c6a8> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireInterruptibly(AbstractQueuedSynchronizer.java:894)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireInterruptibly(AbstractQueuedSynchronizer.java:1221)
        at java.util.concurrent.locks.ReentrantLock.lockInterruptibly(ReentrantLock.java:340)
        at org.jboss.as.web.session.ClusteredSession.acquireSessionOwnership(ClusteredSession.java:517)
        at org.jboss.as.web.session.ClusteredSession.access(ClusteredSession.java:488)
        at org.apache.catalina.connector.Request.doGetSession(Request.java:2638)
        at org.apache.catalina.connector.Request.getSession(Request.java:2382)
        at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:99)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:150)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:559)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)
        at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:490)
        at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:420)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926)
        at java.lang.Thread.run(Thread.java:744)

mm/dd/yyyy hh:mm:ss,226 ERROR [org.apache.catalina.connector] (ajp-server-name/X.X.X.X:8170-25) JBWEB001018: An exception or error occurred in the container during the request processing: java.lang.RuntimeException: JBAS018060: Exception acquiring ownership of KnxvBL8qOoKLtx0Ka9OF97dn
        at org.jboss.as.web.session.ClusteredSession.access(ClusteredSession.java:494)
        at org.apache.catalina.connector.Request.doGetSession(Request.java:2616)
        at org.apache.catalina.connector.Request.getSession(Request.java:2361)
        at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:99)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:145)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:559)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336)
        at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:488)
        at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:420)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:920)
        at java.lang.Thread.run(Thread.java:744) [rt.jar:1.7.0_51]
Caused by: org.jboss.as.clustering.lock.TimeoutException: JBAS010213: Cannot acquire lock default-host/ROOT/KnxvBL8qOoKLtx0Ka9OF97dn from cluster
        at org.jboss.as.clustering.lock.SharedLocalYieldingClusterLockManager.lock(SharedLocalYieldingClusterLockManager.java:439)
        at org.jboss.as.clustering.web.infinispan.DistributedCacheManager.acquireSessionOwnership(DistributedCacheManager.java:400)
        at org.jboss.as.web.session.ClusteredSession.acquireSessionOwnership(ClusteredSession.java:520)
        at org.jboss.as.web.session.ClusteredSession.access(ClusteredSession.java:492)
         12 more

Environment

  • JBoss Enterprise Application Platform (EAP)
    • 6
    • 7
  • Infinispan distributed session cache
  • Load balancer that uses JSESSIONID to maintain session stickiness (mod_jk, mod_proxy, mod_cluster)

  • Load balancer cannot access all members of the session cluster

    • For example, a 2-stage load balancer is forwarding requests to two separate EAP groups, which are part of a single Infinispan cluster.

                    |--EAP1
              |
    |-httpd1--|
    |         |
    |         |--EAP2
    |
F5--|
    |         |--EAP3
    |         |
    |-httpd2--|
              |
              |--EAP4

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