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Weird Caching Issues

Weird Caching Issues

Monday 21 May 2012 9:50:53 pm - 4 replies

I am working with a eZ Publish 4.4 install. Every once in a while (very random) the cache will fail to load all the content into the cache files when they are created. Specifically, every once in a while the navigation menu disappears until we manually clear the cache, in which case the navigation menu returns. Has anybody experienced this before or is there a known fix? I have only ever seen this on an eZ 4.4 install.

Thanks.

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Monday 21 May 2012 10:25:59 pm

Are you running any other caching?  APC?  I've seen weird things happening (randomly) with that...

Monday 21 May 2012 11:53:11 pm

Our configured site.ini cache settings:

 [ContentSettings]
ViewCaching=disabled
[TemplateSettings]
TemplateCache=enabled
TemplateCompile=enabled
Debug=disabled
ShowXHTMLCode=disabled
ShowUsedTemplates=disabled

Tuesday 22 May 2012 9:22:54 am

Is your site slow?  ViewCaching is disabled.

But, otherwise this looks fine.

APC is a PHP module - you would see it listed in phpinfo output.  If you aren't using APC, it could also be caused by varnish or squid or something like that.

Tuesday 22 May 2012 10:08:16 am

Actually an easy test to see if it's APC is to restart apache - if it was APC (and you're not using any other accelerator, proxy, level between your server and the user) then your file will show up.  If not, then it's probably not being created correctly in the eZ cache.

Do you have multiple user roles and some can see this menu and others can't?  This can also happen - if someone without permission to see something comes in first and that portion of the site doesn't have the roles in the cache block key.

Otherwise take a look at any other dynamic reason why this can happen in a cache block.  Maybe turn some cache blocks off temporarily to see if there is some problem.  Also search through the cache to see if that menu is being stored if you can.

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