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RH Bugzilla Integration updated WFLY-406:
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Bugzilla Update: Perform
Bugzilla References:
Redesign web session clustering
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Key: WFLY-406
URL:
https://issues.jboss.org/browse/WFLY-406
Project: WildFly
Issue Type: Task
Security Level: Public(Everyone can see)
Components: Clustering
Reporter: Paul Ferraro
Assignee: Paul Ferraro
Fix For: 8.0.0.Alpha2
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 - a 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 current 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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