[jboss-jira] [JBoss JIRA] (WFLY-11535) Cluster fails to merge if instances started simultaneously

[Radoslav Husar (Jira)]

     [ https://issues.jboss.org/browse/WFLY-11535?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Radoslav Husar resolved WFLY-11535.
-----------------------------------
    Fix Version/s: 16.0.0.Beta1
         Assignee: Radoslav Husar  (was: Paul Ferraro)
       Resolution: Done


Resolving for 16.0.0.Beta1 since JGroups 4.0.16.Final which resolves the issue is already merged via WFLY-11449.

> Cluster fails to merge if instances started simultaneously
> ----------------------------------------------------------
>
>                 Key: WFLY-11535
>                 URL: https://issues.jboss.org/browse/WFLY-11535
>             Project: WildFly
>          Issue Type: Bug
>          Components: Clustering
>    Affects Versions: 14.0.0.Final
>         Environment: Keycloak 4.6.0 official docker image, AWS ECS cluster
>            Reporter: Ian Rodgers
>            Assignee: Radoslav Husar
>            Priority: Major
>             Fix For: 16.0.0.Beta1
>
>         Attachments: Dockerfile, docker-entrypoint.sh, entrypoint.sh, standalone-ha.xml, standalone-ha.xml
>
>
> Our Keycloak docker cluster has four instances, clustered using Jgroups/Infinispan as per the standalone-ha.xml. If you start them all simultaneously the "Receive new cluster" logs indicate four separate clusters, each with a single member. They never get merged into the proper single cluster of four members. It seems to be the merging that has changed. The application then fails (we are not using sticky sessions, and each member is ignorant of the sessions on the other members).
> We can only start the cluster by first starting one instance, then when it is running, starting the other three. The logs then indicate the creation of a single cluster which subsequent instances join.
> This is consistent behaviour, and when we revert back to v.4.5.0, the issue goes away, Unfortunately we need 4.6.0 for an important fix.
> On 4.5.0 we get the message "Received new, MERGED cluster view for channel ejb: MergeView::" when it detects a number of subgroups to merge. This never appears in 4.6.0.



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