[jboss-jira] [JBoss JIRA] (AS7-4260) Occurences of "Exception acquiring ownership of X (via SharedLocalYieldingClusterLockManager)"
Richard Achmatowicz (JIRA)
jira-events at lists.jboss.org
Thu May 17 12:41:18 EDT 2012
[ https://issues.jboss.org/browse/AS7-4260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12693741#comment-12693741 ]
Richard Achmatowicz commented on AS7-4260:
------------------------------------------
Still looking into this one. What I can see happening is as follows:
1. when a failover occurs, a new jvmRoute is being computed by (i) looking up the cache to get the DistributionManager (ii) finding out which addresses own the session key (iii) use the JvmRouteRegistry to look up the new jvmRoute for the key, using the address of the key
2. the jvmRoute is then adjusted and the request continues processing on the node which it arrived at
3. when the request is returned, the load balancer then uses the new jvmRoute to process the request
For example:
{noformat}
11:49:46,418 TRACE [org.jboss.as.web.session.JvmRouteValve] (ajp-perf18-10.16.90.54-8009-361) checkJvmRoute(): check if need to re-route based on JvmRoute. Session id: mdbFou-te-0qzdaY1T6FXyaw.perf21 jvmRoute: perf18
11:49:46,418 TRACE [org.jboss.as.web.session.JvmRouteValve] (ajp-perf18-10.16.90.54-8009-361) handleJvmRoute(): We have detected a failover with different jvmRoute. old one: perf21, new one: perf18. Will reset the session id.
...
11:49:46,420 TRACE [org.jboss.as.web.session.JvmRouteValve] (ajp-perf18-10.16.90.54-8009-361) resetSessionId(): changed catalina session to= [mdbFou-te-0qzdaY1T6FXyaw.perf19] old one= [mdbFou-te-0qzdaY1T6FXyaw.perf21]
{noformat}
In the above, the request arrives at perf18, the jvmRoute assigned is perf19 (based on key ownership), but the request processing is completed at perf18 until the request is returned. In processing at perf18, perf18 will have to take the global lock. If for some reason, the global lock were not being released, then the next time the request was processed by perf19, it would not be able to obtain the lock and the exception would occur. This would at least explain how two requests involving the same session were arising.
Unfortunately, when I add TRACE logging to try to see more of what is going on, the exceptions do not occur.
> Occurences of "Exception acquiring ownership of X (via SharedLocalYieldingClusterLockManager)"
> ----------------------------------------------------------------------------------------------
>
> Key: AS7-4260
> URL: https://issues.jboss.org/browse/AS7-4260
> Project: Application Server 7
> Issue Type: Bug
> Components: Clustering
> Affects Versions: 7.1.1.Final
> Reporter: Radoslav Husar
> Assignee: Richard Achmatowicz
> Labels: JBAS018080
> Fix For: 7.1.3.Final (EAP)
>
> Attachments: SessionTravel.gif, view-perf18.log, view-perf19.log, view-perf20.log, view-perf21.log
>
>
> There are often occurrences of "Exception acquiring ownership of X":
> During shutdown, using dist:
> {noformat}
> 13:09:28,290 WARN [org.apache.catalina.session.ManagerBase] (ContainerBackgroundProcessor[StandardEngine[jboss.web]]) JBAS018080: Standard expiration of session qLQps+CQJxEi6pJTBSzis0g3 failed; switching to a brute force cleanup. Problem is JBAS018060: Exception acquiring ownership of qLQps+CQJxEi6pJTBSzis0g3
> {noformat}
> During server crash, using repl:
> {noformat}
> 12:55:49,556 INFO [org.jboss.as.clustering.impl.CoreGroupCommunicationService.ejb] (Incoming-2,null) JBAS010248: New cluster view for partition ejb: 6 (org.jboss.as.clustering.impl.CoreGroupCommunicationService$GroupView at 327579f6 delta: -1, merge: false)
> 12:55:49,557 INFO [org.infinispan.remoting.transport.jgroups.JGroupsTransport] (Incoming-2,null) ISPN000094: Received new cluster view: [perf21/ejb|6] [perf21/ejb, perf20/ejb, perf18/ejb]
> 12:56:31,694 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host]] (ajp-perf20-10.16.90.58-8009-211) Exception sending request initialized lifecycle event to listener instance of class org.jboss.weld.servlet.WeldListener: java.lang.RuntimeException: JBAS018060: Exception acquiring ownership of MvwC8KGWTuKPjD1-JjLW7URZ
> at org.jboss.as.web.session.ClusteredSession.acquireSessionOwnership(ClusteredSession.java:528) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
> at org.jboss.as.web.session.ClusteredSession.expire(ClusteredSession.java:1260) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
> at org.jboss.as.web.session.ClusteredSession.isValid(ClusteredSession.java:1208) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
> at org.jboss.as.web.session.ClusteredSession.isValid(ClusteredSession.java:598) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
> at org.jboss.as.web.session.DistributableSessionManager.add(DistributableSessionManager.java:917) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
> at org.jboss.as.web.session.DistributableSessionManager.loadSession(DistributableSessionManager.java:1407) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
> at org.jboss.as.web.session.DistributableSessionManager.findSession(DistributableSessionManager.java:686) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
> at org.jboss.as.web.session.DistributableSessionManager.findSession(DistributableSessionManager.java:85) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
> at org.apache.catalina.connector.Request.doGetSession(Request.java:2618) [jbossweb-7.0.13.Final.jar:]
> at org.apache.catalina.connector.Request.getSession(Request.java:2375) [jbossweb-7.0.13.Final.jar:]
> at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:841) [jbossweb-7.0.13.Final.jar:]
> at org.jboss.weld.context.beanstore.http.LazySessionBeanStore.getSession(LazySessionBeanStore.java:72) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31]
> at org.jboss.weld.context.beanstore.http.LazySessionBeanStore.<init>(LazySessionBeanStore.java:58) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31]
> at org.jboss.weld.context.http.HttpSessionContextImpl.associate(HttpSessionContextImpl.java:31) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31]
> at org.jboss.weld.context.http.HttpSessionContextImpl.associate(HttpSessionContextImpl.java:16) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31]
> at org.jboss.weld.servlet.WeldListener.requestInitialized(WeldListener.java:134) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31]
> at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) [jbossweb-7.0.13.Final.jar:]
> at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.13.Final.jar:]
> at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.13.Final.jar:]
> at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb-7.0.13.Final.jar:]
> at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:505) [jbossweb-7.0.13.Final.jar:]
> at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:445) [jbossweb-7.0.13.Final.jar:]
> at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.13.Final.jar:]
> at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_30]
> Caused by: org.jboss.as.clustering.lock.TimeoutException: JBAS010223: Cannot acquire lock //default-host//clusterbench/MvwC8KGWTuKPjD1-JjLW7URZ from cluster
> at org.jboss.as.clustering.lock.SharedLocalYieldingClusterLockManager.lock(SharedLocalYieldingClusterLockManager.java:439)
> at org.jboss.as.clustering.web.infinispan.DistributedCacheManager.acquireSessionOwnership(DistributedCacheManager.java:372)
> at org.jboss.as.web.session.ClusteredSession.acquireSessionOwnership(ClusteredSession.java:520) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
> ... 23 more
> {noformat}
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