Timout Rules

do you mean that the cache timeout feature works properly?

No:

1) EACH of the three pages should be cleared every X minutes.
2) But! EACH X minutes period clears ONLY ONE page cache.

It means for example:

1) If we have all the three caches, only the first one gets cleared after the first X minutes.
2) If the first cache is regenerated and we have all three again, the first one gets cleared after the next X minutes.
3) If the first cache is not regenerated, then the second cache is cleared after the second period. Now we have only one cache. etc….

now I got it. This situation is very difficult to detect. Let’s test them last time.

Here are the cache creation times. Please do not clear cache manually. If the times will not change, it means that there is a problem. if they will change, it means that, there is no problem. Let’s wait 5-6 hours and check the times.

https://test.prepsite.cz/technicka-podpora/ – 20-01-22 9:15:03
https://test.prepsite.cz/spustte-si-kurz-zdarma/ – 20-01-22 9:15:22
https://test.prepsite.cz/registrace-spatne-zadana-adresa/ – 20-01-22 9:15:38

Yes, it is really tricky bastard :).

If we let it go for a couple of hours, they will all have the same creation times at the end. Here is what will happen… We have 5 minutes period set up for all of them.

We have three caches at the start.
– after 5 minutes
We have two caches.
– after 5 minutes
We have one cache.
– after 5 minutes.
We have all caches cleared.
– after several hours.
We will come and see the three pages, all the three caches will be regenerated at the visit time.

The whole problem is that only one cache gets deleted at a time… and when the one cache is regenerated by preload or visit, it is the one that gets deleted the next time. If we would have 10 hours period, not the 5 minutes, it is much more likely that the cache will be regenerated and we will have only the one deleted all the time.

It is hard to see if you look at the pages, easier if you look at the files via ftp. You can see which one disapears.

I suggest a simple method. You don’t need to do a lot of research.

Can we continue?

yes, sure. the cache creation time have changed as far as I see.

Yes, but the test could never show the problem. Let me explain once again. The core of the problem is this:

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Every time when all of the three caches should be cleared only the first cache in the line (actually in the cron tasks list) is cleared.
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So if you give it a time and you don’t regenerate the caches, all of them gets cleared in first three periods. We have 5 minutes periods so all is cleared in 15 minutes.

In real life, if you have 10 hours periods (for nonces) and the site has cache preload active and also visitors, only the first cache gets ever refreshed because it is regenerated again and again and therefore always the first in the row to be cleared. The other two are not cleared nor regenerated for days, sometimes for ever.

• This reply was modified 3 years, 2 months ago by PumpaXXL.

no need to explain. just I want to see that the cache creation time does not change.

I see. So my work is done :).

Let me also mention that something similar happens when you have one rule – for example: /page* and three pages: /page1/, /page2/, /page3/.

sure