[Developers] sandbox caching old values, slow expiration?

[Tim Kientzle]

If you can, the easiest way to handle this is to use a common cookie  
jar across all requesters, since we use a cookie (specifically, the  
"mwLastWriteTime" cookie) to track the time of your last write.  Re- 
reading the cookie jar from your local disk is certainly faster than  
doing a round-trip to our system.

Otherwise, you'll have to use standard HTTP cache-busting measures,  
which will bypass our caching and make both of us slower.

Tim Kientzle


On Jan 30, 2008, at 2:40 PM, Arthur van Hoff wrote:

> I’m running into the caching problem in my python app. Within the  
> same app I do some writes, followed by a read, and I get old data.  
> I’m writing a http server, so it may be due to the multi threaded  
> nature of my application.
>
> Can someone remind me how to work around this problem?
>
> Somebody suggested doing an empty mqlwrite, but that seems too  
> expensive if I have to do it before every mqlread, just in case the  
> cache is stale.
>
> From: developers-bounces at freebase.com [mailto:developers-bounces at freebase.com 
> ] On Behalf Of Coral Link
> Sent: Saturday, December 29, 2007 5:51 AM
> To: developers at freebase.com
> Subject: [Developers] sandbox caching old values, slow expiration?
>
> Hi, quite a few times while working on my app I've run into  
> instances when I've made updates/changes to objects in the sandbox  
> BUT when I query the just changed object, I get its old values.  I   
> run my queries in queryeditor, and the values returned are the  
> updated ones. After some magical period, the mqlwrite/mqlread  
> service starts showing the expected values.
>
> Is there some sort of caching going on?  What are the timeouts if  
> any, to pull the most current values from the repository?  Is there  
> some sort of tickle mechanism to ask mqlread to pull a fresh copy  
> instead of a cached on?
>
> Thank you and kind regards,
> Indy
>
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