[jboss-jira] [JBoss JIRA] Resolved: (JBCLUSTER-280) Access to HAPartiiton membership is not thread-safe

[Brian Stansberry (JIRA)]

     [ https://jira.jboss.org/browse/JBCLUSTER-280?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brian Stansberry resolved JBCLUSTER-280.
----------------------------------------

    Resolution: Done


Fixed as part of initial work on CoreGroupMembershipService

> Access to HAPartiiton membership is not thread-safe
> ---------------------------------------------------
>
>                 Key: JBCLUSTER-280
>                 URL: https://jira.jboss.org/browse/JBCLUSTER-280
>             Project: JBoss Clustering
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: HA-Server-Core
>            Reporter: Paul Ferraro
>            Assignee: Brian Stansberry
>             Fix For: HA-Server-Core 1.0.0.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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