[jira] [Created] (GEODE-1982) Heap LRU with filter based session replication does not actually free up memory

["Dan Smith (JIRA)" <ji...@apache.org>]

Dan Smith created GEODE-1982:
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             Summary: Heap LRU with filter based session replication does not actually free up memory
                 Key: GEODE-1982
                 URL: https://issues.apache.org/jira/browse/GEODE-1982
             Project: Geode
          Issue Type: Improvement
          Components: http session
            Reporter: Dan Smith


Using the session replication module for generic app servers, we install a ServletFilter that wraps sessions in a GemfireHttpSession object. That GemfireHttpSession object has a reference to an underlying native session, and modifications to the GemfireHttpSession are made to the underlying native session as well.

When the module is configured in client/server mode with a client side cache, the client side region has heap lru enabled. Unfortunately, when entries are removed due to heap lru, the application server is still going to retain a reference to the native session. I've observed this happening in a debugger, unfortunately I don't have a reproducible test case for this yet.

With Jetty, at least, it retains a weak reference to the session, so I suppose the session could eventually be removed, but other application servers may not use weak references.



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