[jboss-jira] [JBoss JIRA] Created: (JBAS-4682) Web session passivation does very little with FIELD granularity

[Brian Stansberry (JIRA)]

Web session passivation does very little with FIELD granularity
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                 Key: JBAS-4682
                 URL: http://jira.jboss.com/jira/browse/JBAS-4682
             Project: JBoss Application Server
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: Clustering, Web (Tomcat) service
    Affects Versions: JBossAS-5.0.0.Beta2
            Reporter: Brian Stansberry
         Assigned To: Brian Stansberry


Passivation of clustered HttpSessions works by evicting the node tree representing a given session from the cache. Configuration is based on defining how many active (in-memory) sesssion are allowed and how old they can be before passivating them.  Problem is, with FIELD replication, the bulk of the data associated with a session is not in that sessions's subtree; it's in the _JBossInternal_ area.  Evicting the session's tree doesn't free up the memory associated with the POJOs.

Structure of data in JBC:

/JSESSION
+++ /localhost
++++++/webapp
+++++++++/session12345
+++++++++/session67890
+++++++++/_JBossInternal_
++++++++++++/pojoAAAAA
++++++++++++/pojoBBBBB

(Note: session passivation is not done using the regular JBC eviction algorithms, as JBC doesn't understand what a "session" is.  The http session replication layer manages the passivation, just using the JBC evict() method to do the actual passivation.)

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