Remove references to last page from SecondLevelCacheSessionStore from idle
sessions to reduce memory usage
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Key: WICKET-3091
URL: https://issues.apache.org/jira/browse/WICKET-3091
Project: Wicket
Issue Type: Improvement
Components: wicket
Affects Versions: 1.4.12
Reporter: Stefan Fussenegger
I've already described this idea in WICKET-2889. The proposed implementation
(patch attached to WICKET-2889) was rejected though:
> From: Johan Compagner <[email protected]>
> Date: Mon, 9 Aug 2010 17:00:12 +0200
> Message-ID: <[email protected]>
> Subject: Re: Could somebody please comment on WICKET-2889?
> To: [email protected]
> Content-Type: text/plain; charset=ISO-8859-1
>
> I am against that patch.
> You keep pagemaps in memory in the applicaiton context!
> Those are session stuff stored in the HttpSession. You shouldnt keep
> reference to those stuff.
> This can break all kind of things (for example clustering)
>
> If you want something like that, then it is fine if we need to change
> something so that you can overwrite some stuff so that you can do what
> you want without patching wicket.
> But i dont want this to be default in wicket.
As I understood, the objects are to the implementation not the idea itself. I
still consider this a very valuable improvement as it has the potential to
drastically reduce Wicket's memory consumption in productions environments,
especially for applications that make (heavy) use of statefull pages. An
average page in our application used 115K of memory. With 1500 live sessions
within 30 minutes, last pages accumulated for 170M memory usage. By expiring
the last page after 10 minutes, this could be cut by 2/3 or 113M. (btw: if I
remember correctly, Wicket's heap usage wasn't more than 220M in total, hence
reducing overall memory usage by about 50%)
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