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

  • Resolved macobserver

    (@macobserver)


    4 years, 7 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 4 years, 7 months ago by macobserver.
    • This topic was modified 4 years, 7 months ago by macobserver.
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  • pukos

    (@pukos)

    4 years, 6 months ago

    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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