[jboss-jira] [JBoss JIRA] (WFLY-12718) Clustering: replicated-cache sampling errors

[Paul Ferraro (Jira)]

    [ https://issues.jboss.org/browse/WFLY-12718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13813824#comment-13813824 ] 

Paul Ferraro commented on WFLY-12718:
-------------------------------------

[~tommaso-borgato] OK - we found the problem.  This issue is with this condition:
https://github.com/wildfly/wildfly/blob/18.0.1.Final/clustering/web/cache/src/main/java/org/wildfly/clustering/web/cache/session/coarse/CoarseSessionAttributes.java#L80

This skips triggering a mutation of the object in the event that the old value and new value reference the same object.  However, the QE test application uses setAttribute(...) to force replication of an @Immutable object.

> Clustering: replicated-cache sampling errors
> --------------------------------------------
>
>                 Key: WFLY-12718
>                 URL: https://issues.jboss.org/browse/WFLY-12718
>             Project: WildFly
>          Issue Type: Bug
>          Components: Clustering
>    Affects Versions: 18.0.0.Final
>            Reporter: Tommasso Borgato
>            Assignee: Paul Ferraro
>            Priority: Blocker
>
> The issue is about replicated-cache in fail-over tests.
> WildFly is started in clustered mode using a replicated cache for replicating HTTP session data across cluster nodes; all 4 nodes in the cluster are initialized with the following cli script:
> {noformat}
> embed-server --server-config=standalone-ha.xml
> /subsystem=jgroups/channel=ee:write-attribute(name=stack,value=tcp)
> /subsystem=infinispan/cache-container=web/replicated-cache=testRepl:add()
> /subsystem=infinispan/cache-container=web/replicated-cache=testRepl/component=locking:write-attribute(name=isolation, value=REPEATABLE_READ)
> /subsystem=infinispan/cache-container=web/replicated-cache=testRepl/component=transaction:write-attribute(name=mode, value=BATCH)
> /subsystem=infinispan/cache-container=web/replicated-cache=testRepl/store=file:add()
> /subsystem=infinispan/cache-container=web:write-attribute(name=default-cache, value=testRepl)
> {noformat}
> The test is run with wildfly-18.​0.0.Final.zip;
> The same tests run with version wildfly-17.​0.1.Final.zip do not have any problem;
> hence this looks like a regression;
> As usual, we test that the serial value stored in the replicated cache is incremented at every call: when this is not true, we say we have a sampling error;
> Here are the runs that exhibit this issue: 
> - **22.82% Fail Rate with WildFly-18 ** [eap-7.x-clustering-http-session-shutdown-repl#23|https://eap-qe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/EAP7/view/EAP7-Clustering/view/EAP7-Clustering-HTTP-Session/job/eap-7.x-clustering-http-session-shutdown-repl/23/artifact/report/jm/html/index.html]
> - **0% Fail Rate with WildFly-17 ** [eap-7.x-clustering-http-session-shutdown-repl#24|https://eap-qe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/EAP7/view/EAP7-Clustering/view/EAP7-Clustering-HTTP-Session/job/eap-7.x-clustering-http-session-shutdown-repl/24/artifact/report/jm/html/index.html]
> We also repeated the tests to make sure it can be reproduced:
> - **22.75% Fail rate with WildFly-18 ** [eap-7.x-clustering-http-session-shutdown-repl#26|https://eap-qe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/EAP7/view/EAP7-Clustering/view/EAP7-Clustering-HTTP-Session/job/eap-7.x-clustering-http-session-shutdown-repl/26/artifact/report/jm/html/index.html] 
> - **0% Fail Rate with WildFly-17 ** [eap-7.x-clustering-http-session-shutdown-repl#25|https://eap-qe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/EAP7/view/EAP7-Clustering/view/EAP7-Clustering-HTTP-Session/job/eap-7.x-clustering-http-session-shutdown-repl/25/artifact/report/jm/html/index.html]



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