[jboss-jira] [JBoss JIRA] (WFLY-5233) Optimize marshalled size of web sessions

[Paul Ferraro (JIRA)]

Paul Ferraro created WFLY-5233:
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             Summary: Optimize marshalled size of web sessions
                 Key: WFLY-5233
                 URL: https://issues.jboss.org/browse/WFLY-5233
             Project: WildFly
          Issue Type: Enhancement
          Components: Clustering
    Affects Versions: 10.0.0.Beta2
            Reporter: Paul Ferraro
            Assignee: Paul Ferraro
             Fix For: 10.0.0.CR1


There are a couple of marshalling optimizations that we can make in the current web session clustering code:

* We currently marshal session identifiers as UTF-8 strings.  For the default session id length, this comes out to 42 bytes.  Since session ids use a limited alphabet (modified base64) we can easily reduce this to 30 bytes (31 to support variable length).
* We currently store the metadata of a session in a single cache entry.  The metadata is composed of:
*# Creation timestamp (long)
*# Last access timestamp (long)
*# Max inactive interval (int)

#1 is static.  #2 updates every request. #3 is "effectively" static.  If we split the metadata cache entry into 2: one containing static metadata, the other dynamic metadata; we can reduce the size of the data that needs to be replicated every request.  Additionally, #3 can be represented as a duration of time since #1, and thus can be expressed as a short or integer instead of a long.  Thus, for requests that do not modify the session, we only need to replicate 4 bytes or less instead of 20.



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