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colinmollenhour / Cm_Cache_Backend_Redis

A Zend_Cache backend for Redis with full support for tags (works great with Magento)
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Strange problem with Redis and FPC and currencies #114

Closed postadelmaga closed 7 years ago

postadelmaga commented 7 years ago

Disclaimer:

This probably not the best place to post this issue since I am not 100% sure it is related to Redis, so feel free to close it in case you I am abusing this space

My store is multi domain and every domain has a different default currency:

The store has EE FPC enabled on Redis backend.

The issue:
Sometime product pages of the store .com get cached with a wrong currency. ( if I clean FPC then the page/currency it is ok )

Now FPC stores the key using the request and cookies ( so also the currency in case the user changed it) thus the key should be unique for every url/currency request.
Anyway It looks like in some cases, request to product page X on the Domain A override the cached page for the Domain B.

I cannot figure out what is the reason because this is happening on random basis and It is hard to reproduce.

What can I check ? any idea to debug this is very welcome

colinmollenhour commented 7 years ago

I would say this is not related to the backend and instead an application level bug. I don't even have access to EE source code so can't help you but it sounds like maybe there is an order of operations issue such as the cache key is built before the cookie is set on the first visit or something of that nature. Getting support for this kind of problem is why you pay for the EE license though, right?

postadelmaga commented 7 years ago

ok thanks for your feedback and the great work creating this backend :)

postadelmaga commented 7 years ago

by the way I find the issue. I confirm it is not related to Redis, but to an inconsistent behavior of Magento Store obj and the EE FPC Processor and how they manage the current currency value ( one use cookie the other the session )

For more details see: http://magento.stackexchange.com/questions/147482/fpc-issue-wrong-currency

colinmollenhour commented 7 years ago

Thanks for the update!