[jboss-jira] [JBoss JIRA] (WFLY-4333) Transaction must be sticky to ensure consistency for EJB remote invocation with JPA

[Richard Achmatowicz (JIRA)]

    [ https://issues.jboss.org/browse/WFLY-4333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13089453#comment-13089453 ] 

Richard Achmatowicz commented on WFLY-4333:
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The issue seems to be as Wolf stated that, for this particular atypical SLSB deployment, if multiple invocations on the bean occur within the same transaction, they need to be able to be tied to one node for the duration of the transaction.

> Transaction must be sticky to ensure consistency for EJB remote invocation with JPA
> -----------------------------------------------------------------------------------
>
>                 Key: WFLY-4333
>                 URL: https://issues.jboss.org/browse/WFLY-4333
>             Project: WildFly
>          Issue Type: Bug
>          Components: EJB
>            Reporter: Wolf-Dieter Fink
>            Assignee: Tomasz Adamski
>            Priority: Critical
>              Labels: ejb, transaction
>
> If an application inside of a server uses standard JavaEE persistence JPA, the current implementation include a local 1. level cache which might end in inconsistent reads within the same (uncommited) transaction.
> There are two reasons
> - JPA must not flush changes to an entity until commit
> - The 1. level cache might not read from the persistence if the entity is already loaded in a transaction
> Therefore the server to server invocations of EJB's need to be sticky to one node during a transaction. The granularity must be the application.
> It might be worth to use already known nodes for other applications as well.
> The stickyness should be enabled automatically if a transaction is active and distributed, which is the default within the current implementation, and use the loadbalancing policy if no transaction is active.



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