[jboss-jira] [JBoss JIRA] (WFLY-7032) Optimize distributed web session creation

[Paul Ferraro (JIRA)]

Paul Ferraro created WFLY-7032:
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             Summary: Optimize distributed web session creation
                 Key: WFLY-7032
                 URL: https://issues.jboss.org/browse/WFLY-7032
             Project: WildFly
          Issue Type: Enhancement
          Components: Clustering
    Affects Versions: 10.1.0.Final
            Reporter: Paul Ferraro
            Assignee: Paul Ferraro
             Fix For: 11.0.0.Alpha1


Following session ID generation, we currently validate that the session ID is not already in use, in which case, we generate a new ID.  This is not only racey, but requires a call to Cache.containsKey(...).  This is potentially a costly call, since we need to search both memory and the cache store - particularly costly when using a remote cache store.  We eventually add the new session via Cache.putIfAbsent(...), which already atomically ensures no session with that ID already exists.
Additionally, when creating the dependent cache entries for a session (i.e. access meta data, session attributes), we don't need putIfAbsent semantics - a AdvancedCache.withFlags(Flags.IGNORE_RETURN_VALUES).put(...) will suffice.



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