[jboss-jira] [JBoss JIRA] (AS7-6946) Redesign web session clustering

[Paul Ferraro (JIRA)]

Paul Ferraro created AS7-6946:
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             Summary: Redesign web session clustering
                 Key: AS7-6946
                 URL: https://issues.jboss.org/browse/AS7-6946
             Project: Application Server 7
          Issue Type: Task
          Components: Clustering
    Affects Versions: EAP 6.1.0.Alpha (7.2.0.Final)
            Reporter: Paul Ferraro
            Assignee: Paul Ferraro
             Fix For: 8.0.0.Alpha1


The current web session replication code has been around for ages and suffers from a number of issues:
* By maintaining a separate local map of sessions in conjunction with the session data stored in the distributed cache, stale data is inevitable - an number of issues have cropped up in EAP testing.
* Extra concurrency measures are required to ensure synchronicity of the local session map with the distributed cache.
* Extra logic/locking is required to invalidate the local session map is required per request
* AtomicMaps, on which the currently implementation relies, have proven buggy
* Session access outside of the scope of the replication valve is possible and problematic
* Maintaining sessions locally means that the clustering code needs to implement passivation and expiration manually - instead of leveraging Infinispan full capabilities.
* The current code base is tightly coupled to JBoss Web.  Migrating the code to support Undertow will inevitably introduce issues and code duplication.

The new design will incorporate a proper SPI for the servlet container.  Thus the logic to integrate with Undertow vs JBoss Web will be relatively thin.

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