Manual wp-cron Scheduling Causes PHP wp_cache_flush_runtime Error

  • Resolved David Adams

    (@tictag)


    1 year, 10 months ago

    Rank Math was installed on a website I recently took ownership of. As far as I know, there were no issues with it. I found that most wp-cron jobs were being severely delayed due to a lack of site visitors so I disabled wp-cron scheduling define('DISABLE_WP_CRON', true); and instead initiated wp-cron with a server crontab job wp cron event run --due-now, 0,30 * * * * to forcibly initiate wp-cron every 30 minutes, irrespective of site visitors.

    This works fine and now all wp-cron functions execute without delay.

    Since running wp-cron this way, however, the OS (Fedora Linux) crontab job and WordPress debugging reports the following PHP Notice:

    Notice: Function wp_cache_flush_runtime was called <strong>incorrectly</strong>. Your object cache implementation does not support flushing the in-memory runtime cache. Please see <a href="https://www.ads-software.com/support/article/debugging-in-wordpress/">Debugging in WordPress</a> for more information. (This message was added in version 6.1.0.) in /home/customer/www/<server>/public_html/wp-includes/functions.php on line 5835

    I traced this error back to a Rank Math wp-cron hook/action (I’m sorry, I don’t remember which one). Deactivating Rank Math solved the problem.

    I would like to continue running Rank Math but also have a level of control over wp-cron for the reasons stated above.

    Is this possible? Or is it one or the other?

    David.

Viewing 9 replies - 1 through 9 (of 9 total)
  • Plugin Support Rank Math Support

    (@rankmathteam)

    Hello @tictag,

    Thank you for contacting the support, and sorry for any inconvenience that might have been caused due to that.

    Can you please try the following filter?
    function wp_cache_supports( $feature ) {
    if ( $feature === 'flush_runtime' ) {
    return true;
    }
    return false;
    }

    There’s also a proposed change here:
    https://core.trac.www.ads-software.com/changeset/54448

    Hope that helps.

    We have the same problem, will you do anything at the plug-in side on future versions to solve this?

    The above code isn’t a filter right, its a core WP function, should we overwrite it?

    Thread Starter David Adams

    (@tictag)

    Apologies for the delay is replying, I’ve had some personal matters to attend to.

    I added the code above to a ‘Snippets’ snippet and received the following error on activation:

    The snippet has been deactivated due to an error on line 2:
    Cannot redeclare function wp_cache_supports.

    Please advise.

    Plugin Support Rank Math Support

    (@rankmathteam)

    Hello @tictag,

    The function we shared is a default function since WordPress 6.1 so you would need to add this to the following file and replace the current implementation: wp-includes\cache-compat.php

    Don’t hesitate to get in touch if you have any other questions.

    Thread Starter David Adams

    (@tictag)

    Do you not think that this information should have been included in your original request, or were you expecting me to know this off-hand?

    I am not prepared to hack my WordPress installation just to do your troubleshooting for you. This is a live site and I am not clever enough to be able to fix it if your hack doesn’t work.

    Are you able to re-create this issue on your own test sites? If so, please just let me know when you have a fix available. Until then, I will keep Rank Math disabled whilst I look for an alternative.

    The clock is ticking.

    Thread Starter David Adams

    (@tictag)

    p.s. This ticket has NOT been resolved!!

    Plugin Support Rank Math Support

    (@rankmathteam)

    Hello @tictag,

    Sorry for the inconvenience caused. However, adding the filter to the file mentioned before shouldn’t cause any issues with the site and will fix the issue.

    Having said that, we are working on a fix for this and will inform you here once we release an update.

    We really appreciate your patience in the meantime.

    Just a side note, that’s not a filter, that’s a function, not a good idea to change core functions but if this a temporary issue there is no problem. The main thing is the last post, thats what we want to hear, this is not a environment or installation issue, its a bug thats being addressed.

    Plugin Support Rank Math Support

    (@rankmathteam)

    Hello @negapo,

    Yes, it was a temporary solution and the fix will be released in the upcoming update of our plugin. You can keep an eye on our changelog to get notified: https://rankmath.com/changelog/

    Let us know if you need any other assistance.

Viewing 9 replies - 1 through 9 (of 9 total)
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