“Missed Schedule” and wp-cron issues with W3TC Object Cache

  • Resolved macgeekgab

    (@macobserver)


    5 years, 5 months ago

    We’ve been fighting with “Missed Schedule” errors for years, and the site is plenty busy, so it’s not from a lack of traffic.

    Digging into this we narrowed down the issue: the W3TC Object Cache.

    I noticed that wp-cron.php sets a doing_cron transient. W3TC’s Object Cache has something in it about caching transients, so… I kinda figured maybe that was the issue. Disabling the Object Cache solved it. I A/B tested and that’s it, for sure.

    TL;DR: Having Object Cache enabled keeps calls to wp-cron.php from doing anything. Disabling Object Cache causes things like scheduled posts work perfectly.

    (we’re using redis, so maybe that’s part of it? I haven’t tested that. Edit: I’ve tried with both redis and memcached and it fails with both).

    • This topic was modified 5 years, 5 months ago by macgeekgab.
    • This topic was modified 5 years, 5 months ago by macgeekgab.
Viewing 16 replies (of 16 total)

  • Hi @vmarko
    First of all, thank you for taking care of this problem. I know this is a free product anyway there is more people than you expect with the same problem and this should be a good occasion to investigate togheter.

    Repliyng to you…

    1. It does not depend on the time because I left object enable for 2 hours and none of the task has been executed. (according to my Cron events plugin)

    2. Same as above. Even if in the debug I can see some specific hook has been executed, it is still pending in queue.

    3. Not very sure to had understood this sentence ??

    Please don’t give up, maybe together we can understand the problem.

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