dogpiling (wiki broken)
mark at feedjit.com
Tue Mar 30 13:06:51 MSD 2010
I tried to update the documentation to add an explanation of the
'updating' parameter of proxy_cache_use_stale but it appears to have
broken the entire documentation page on the proxy module after I saved
my changes to the wiki. It's now blank:
When I hit save the wiki server sent me an index.php file that my
browser wanted to save to disk (incorrect mime type set). I tried
several times to re-save or cancel my edit but same result.
Piotr Sikora wrote:
>> 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 at frickle.com >
> nginx mailing list
> nginx at nginx.org
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