[jboss-jira] [JBoss JIRA] Updated: (JBAS-5631) Access to HAPartiiton membership is not thread-safe

[Brian Stansberry (JIRA)]

     [ https://jira.jboss.org/jira/browse/JBAS-5631?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brian Stansberry updated JBAS-5631:
-----------------------------------

    Fix Version/s: JBossAS-5.1.0.Beta1


> Access to HAPartiiton membership is not thread-safe
> ---------------------------------------------------
>
>                 Key: JBAS-5631
>                 URL: https://jira.jboss.org/jira/browse/JBAS-5631
>             Project: JBoss Application Server
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Clustering
>    Affects Versions: JBossAS-4.0.0 Final, JBossAS-4.0.1RC1, JBossAS-4.0.1 Final, JBossAS-4.0.1 SP1,  JBossAS-4.0.2RC1, JBossAS-4.0.2 Final,  JBossAS-4.0.3RC1,  JBossAS-4.0.3RC2, JBossAS-4.0.3 Final, JBossAS-4.0.3 SP1,  JBossAS-3.2.8RC1, JBossAS-4.0.4RC1, JBossAS-3.2.8 Final, JBossAS-3.2.8.SP1, JBossAS-4.0.4.CR2, JBossAS-4.0.4.GA, JBossAS-4.0.5.CR1, JBossAS-4.0.5.GA, JBossAS-5.0.0.Beta1, JBossAS-4.2.0.CR1, JBossAS-5.0.0.Beta2, JBossAS-4.2.0.CR2, JBossAS-4.2.0.GA, JBossAS-4.2.1.GA, JBossAS-4.2.2.GA,  JBossAS-5.0.0.Beta3, JBossAS-5.0.0.Beta4
>            Reporter: Paul Ferraro
>            Assignee: Brian Stansberry
>             Fix For: JBossAS-5.1.0.Beta1
>
>
> There are 2 problems with the current implementation.
> 1. Currently, the membership collections, while synchronized, are both non-volatile and updated in a non-final fashion, so concurrent access by both view changes and rpc invocations is not thread-safe.
> 2. Membership is expressed in 4 different vectors.  During view change, these vectors are not updated atomically.
> To address both problems, the 4 vectors ought to be encapsulated into a single volatile, immutable object.

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