Hi all.
I have a site which makes use of Google's Analytics API which allows me to
grab the most-viewed content on my site and then show it in various ways
around the site ("most popular articles" etc). The query against this API
is slow (takes a couple of seconds) so I've been caching it as described in
my StackOverflow question about the technique
here<http://stackoverflow.com/questions/13323150/advice-needed-on-django-caching-strategy>
,
The basic process is this:
- A cron job hits a URL endpoint every 15 minutes
- This URL makes the API request and caches the results (for 1 hour, in
case the cron ever fails)
- Meanwhile, my app's views request this data and get served the cached
data.
- In my views, I wrap all usage of this data in named template fragment
caches
- The cron endpoint clears both the high-level cache (which the views
call) and the template fragment caches
- I use a site-wide cache for the entire app.
This kind of works, but occasionally results in blank spaces where the data
should be -- running the cron job manually has no effect on this.
Occasionally, experimenting with restarting the server, clearing the app's
cache and immediately calling the cron endpoints can fix things. After an
hour or so things tend to work themselves out but it seems that the 15
minute updates don't actually reflect in the templates.
The StackOverflow advice I got seemed to suggest that using template
fragment caching *inside* a sitewide cached view should respect the inner
cache setting, but it doesn't seem to.
Can anyone suggest a strategy for making this work reliably? Every time I
deploy a new build of the app (and restart the server) it wipes the cache
and pinging the update URL does nothing. I'm sure my logic is just a little
wrong.
thanks
Matt
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