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https://issues.apache.org/jira/browse/MYFACES-3779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13774331#comment-13774331
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Thomas Andraschko commented on MYFACES-3779:
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Don't know if this is really usefull - The state is sooooo small if you don't 
blow it up with your ViewScopd beans.
IMO The only usecass when a mixed mode is really usefull i described here: 
http://tandraschko.blogspot.de/2012/12/dynamical-switching-of-jsf-state-saving.html
                
> Mixed mode(Server+client) for state saving
> ------------------------------------------
>
>                 Key: MYFACES-3779
>                 URL: https://issues.apache.org/jira/browse/MYFACES-3779
>             Project: MyFaces Core
>          Issue Type: New Feature
>            Reporter: Ertio Lew
>
> How about having a mixed mode for state saving whereby state is initially 
> kept on server for a configurable amount of time (so that fast frequent 
> requests are served without transferring the state from client to server 
> several times, the drawback with client side saving) & after that period of 
> time if the page is still alive in browser but it is idle, a javascript 
> request is triggered which asks the server for that state data & now it will 
> be kept on client side, now the client & the server both know that state for 
> this session is there on client. If the page has died & no request has been 
> sent to server asking for state data till that period of time, then state 
> data would be removed from server.
> A further enhancement could be that you could set a fixed amount out of all 
> memory on server that you want to allocate for state saving of all sessions. 
> Till the time that quota remains, state is kept on server using that quota. 
> But when that quota is over all the state information for further sessions is 
> kept using client side state saving. Also a mixed mode.
> Such mixed modes would be very helpful in improving performance, & better 
> utilization of the server resources.

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