Redis-backed session state not saving everything

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We are trying to move from server session (IIS) to Redis-backed session. I updated my web.config with the custom sessionState configuration. I'm finding that only SOME of my key/value pairs are being saved. Of the 5 I expect to be in there, there are only 2. I verified all my code is ultimately hitting HttpContext.Current.Session.Add. I verified that my POCOs are marked as serializable. Looking at monitoring, I see that it adds the first two pairs, then everything after that just doesn't make it. No hit, no rejection, no exceptions. Nothing.

Anyone ever see this? Know where I could start to look to resolve?

TIA, Matt

Update 1: I've switched to using a JSON serializer to store my data. Same thing. Doesn't seem to be a serialization issue.

Update 2: I've now downloaded the source code, compiled and am debugging it. The method SetAndReleaseItemExclusive, which seems to send the session items to Redis, is only hit once, though it should be hit more than once as my web site handle SSO and bounces from page to page to load the user and such. Have to investigate why it's only firing once...

redis
1 Answers

Figured it out. Turns out that my AJAX request to an "API" endpoint without my MVC app did not have the appropriate session state attached. Therefore, the SetAndReleaseItemExclusive was never called. Adding this fixed it:

protected void Application_PostAuthorizeRequest()
    {
        if (HttpContext.Current.Request.Url.LocalPath == "/api/user/load")
            HttpContext.Current.SetSessionStateBehavior(System.Web.SessionState.SessionStateBehavior.Required);
        else
            HttpContext.Current.SetSessionStateBehavior(System.Web.SessionState.SessionStateBehavior.ReadOnly);
    }
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