> He's referring to a cache stampede, when an item in the proxy cache
> expires and multiple threads simultaneously try to repopulate it causing
> load spikes and possible locking conditions.

nginx changes status of expired cache items to "UPDATING" for the period of
time when it fetches new copies. Combine this with "proxy_cache_use_stale
updating" and "dogpiling" shouldn't be a problem.

Best regards,
Piotr Sikora < piotr.sikora@frickle.com >



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