[Plugin: WP Super Cache] Preloaded Caches Not Working

(@lincolnadams)

I checked it again, it appears the deletions do indeed start occurring right after it preloads my blog page. Any help appreciated!

Plugin Author

(@donncha)

Can you send me your wp-content/wp-cache-config.php please? Send it to donncha AT ocaoimh.ie

That will hopefully help me track down why this is happening.

Thread Starter

(@lincolnadams)

Sending it now!

Plugin Author

(@donncha)

Thanks Lincoln – got it. How long did the preload take to run? I see that you have the preload interval set to 70 minutes. How long did the preload take to run? Did it take longer than that time?

I think what may be happening is the preload is now taking longer (probably because of the archives getting preloaded). Can you set the preload interval to 720 minutes instead?

Thread Starter

(@lincolnadams)

It takes about 15 minutes for the preload to complete its cycle. I’ll set it to 720 minutes now to see if that helps things and report back.

Plugin Author

(@donncha)

I just tried a partial preload of my own site with a short interval and it was fine. Everything in your config file looks good too.

If you can download wp-cache-phase2.php and upload it to wp-content/plugins/wp-super-cache/, overwriting the file already there it may help spot a problem. I added the cache age limit to the “gc: deleted…” debug messages.

The debug messages from my server were ok but maybe there’s something odd happening in the code that isn’t triggered on my server. 🙁

Thread Starter

(@lincolnadams)

I’ve updated the file and did another test run. Nothing changed except the phrase “forced delete” is affixed to each deleted cache file:

00:23:20 /blog supercache dir: /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/blog/
00:23:20 /blog No wp-cache file exists. Must generate a new one.
00:23:20 /blog In WP Cache Phase 2
00:23:20 /blog Setting up WordPress actions
00:23:20 /blog Created output buffer
00:23:21 /blog Output buffer callback
00:23:21 /blog Anonymous user detected. Only creating Supercache file.
00:23:21 /blog Writing non-gzipped buffer to supercache file.
00:23:21 /blog Renamed temp supercache file to /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/blog/index.html
00:23:21 /blog Sending buffer to browser
00:23:21 /blog wp_cache_shutdown_callback: collecting meta data.
00:23:22 /wp-cron.php?doing_wp_cron supercache dir: /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/the-quest-to-find-cowboys-in-texas, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/an-otterbox-slideout-solution-case-for-the-iphone-4, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/from-denver-to-colorado-springs-to-denver, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/well-i-wont-be-doing-that-again-for-a-while, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/its-midnight-so-its-time-for-some-hot-chocolate, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/the-new-reflex-case-for-the-iphone-44s-by-otterbox-should-you-get-it, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/im-baaaaaaaaack, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/i-really-hate-the-tsa, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/time-to-man-up-my-travel-gear-brxtravelgear, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/why-i-suck-at-writing-dating-profiles, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/everything-i-know-about-los-angeles-i-learned-from-harry-bosch-my-trip-to-blogworld-la, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/memories-nothing-but-the-memories, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/how-do-i-know-yellowstone-will-finally-erupt-and-engulf-all-of-north-america-next-week-because-ill-be-there, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/so-true-so-so-true, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/planning-ahead-landing-in-denver-and-prancing-about-town-from-there, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/rockefeller-statue, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/delta-bans-jews-and-christians-from-flying-their-airline, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/miss-me-yet, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/newark-airport-parking, forced delete
00:23:22 /wp-cron.php?doing_wp_cron gc: deleted /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/did-god-read-my-rants-on-check-in-apps, forced delete

And so on. This mass delete is always triggered after it hits “/blog” too. I’m wondering if it’s a theme conflict of some kind (I’m using the Headway theme, http://www.headwaythemes.com )

Thread Starter

(@lincolnadams)

Maybe I can avoid this issue if the preload can somehow skip trying to preload my post page “/blog” Is there a way to limit Super Cache to only preloading single posts pages rather than posts, tags, categories and pages? I didn’t have this issue in .9.9.9 so I’m wondering if this change in the preload mechanism might be a reason why this is happening.

Plugin Author

(@donncha)

Hopefully I’ve got a fix for this now. I modified wp-cache.php. Can you copy that file into your wp-super-cache/ directory and do a preload again?

Thanks for helping me debug it!

Thread Starter

(@lincolnadams)

You’re welcome, don’t mind debugging things especially if it resolves issues others might have too. Checking it now BTW, and it seems to be working again.

16:08:36 /blog supercache dir: /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/blog/
16:08:36 /blog No wp-cache file exists. Must generate a new one.
16:08:36 /blog In WP Cache Phase 2
16:08:36 /blog Setting up WordPress actions
16:08:36 /blog Created output buffer
16:08:37 /blog Output buffer callback
16:08:37 /blog Anonymous user detected. Only creating Supercache file.
16:08:37 /blog Writing non-gzipped buffer to supercache file.
16:08:37 /blog Renamed temp supercache file to /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/blog/index.html
16:08:37 /blog Sending buffer to browser
16:08:37 /blog wp_cache_shutdown_callback: collecting meta data.
16:08:38 /wp-cron.php?doing_wp_cron supercache dir: /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/
16:08:38 /wp-cron.php?doing_wp_cron clear_post_supercache: deleting /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com//index*.html files
16:08:38 / supercache dir: /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/
16:08:38 / No wp-cache file exists. Must generate a new one.
16:08:39 / In WP Cache Phase 2
16:08:39 / Setting up WordPress actions
16:08:39 / Created output buffer
16:08:40 / Output buffer callback
16:08:40 / Anonymous user detected. Only creating Supercache file.
16:08:40 / Writing non-gzipped buffer to supercache file.
16:08:40 / Renamed temp supercache file to /home2/redacted/public_html/wp-content/cache/supercache/www.redacted.com/index.html
16:08:40 / Sending buffer to browser
16:08:40 / wp_cache_shutdown_callback: collecting meta data.

So far the mass deletions that trigger after it preloads /blog have stopped, just have to wait to ensure the caches expire without issue and are preloaded again after 70 minutes.

What was changed if you don’t mind me asking?

Plugin Author

(@donncha)

There was a call to prune_super_cache() to delete the current post or page before regenerating it. Unfortunately when it hit the homepage it deleted everything underneath it too – all the cached pages!

I changed it to delete the index*.html files instead.

To anyone else reading this thread, try the development version, wp-super-cache.zip, as it has this fix and a couple of other fixes.

Thread Starter

(@lincolnadams)

Thanks, I confirmed the caches are staying cached now and refreshing according to schedule again. 😀

Plugin Author

(@donncha)