![(please configure the [header_logo] section in trac.ini)](/chrome/site/your_project_logo.png){kind=logo}
Opened 15 years ago
Closed 14 years ago
#17888 closed defect (bug) (worksforme)
Problems with build in Cronjob Schedule - is this a bug?
| Reported by: | 1manfactory | Owned by: | |
|---|---|---|---|
| Priority: | normal | Milestone: | |
| Component: | Cron API | Version: | 3.1.3 |
| Severity: | normal | Keywords: | |
| Cc: | Focuses: |
Description
I have programmed a pluging (Emu2 - Email Users 2) to send out mails to users/groups. It's still beta but the main functions work.
Now I added a feature for a digest of the newest posts to be sent out once a day controlled by the build in scheduler.
I do the following:
# plan the scheduler
add_action('EMU2_task_hook', 'EMU2_send_scheduled');
where EMU2_send_scheduled is the function sending all the mails. This is working.
wp_clear_scheduled_hook('EMU2_task_hook');
wp_schedule_event( strtotime( $schedule_time ) - get_option('gmt_offset') * 3600 , 'daily', 'EMU2_task_hook' );
Where $schedule_time is set by the user, e.g. "23:15" for mails to be sent at 11:15 pm.
This works, I checked it with wp-crontrol.
But now come the problems.
Some of the users which downloaded my plugin reported strange behaviors with the scheduled mails send out every hour instead of only once a day. Or with mails send three times in a row.
I first thought they did something wrong. But after a few days of stable work it happened to me as well (Online, less than 10 users, Linux)
I am using/testing this on 5 installations, online and offline, on different hosts and systems (Windows/xampp and Linux). Some work today, but they fail the next day with sending two or even three mails at once, i.e. starting the job two/three times.
I have no clue what is going on.
Is this a bug? Is this caused by interferences with other schedules or plugins?
Change History (6)
#2
@
15 years ago
- Resolution invalid
- Status closed → reopened
OK,
I deactivated EVERY plugin except my own.
And again the error only sometimes occurs, which is really stressing.
From what I heard from others is that they also only have irregular problems with my plugin.
I installed this - as written above - on different environments. And the problem consists.
I don't know what else to do. There is no clear sign for me why it sometimes works and sometimes not.
It smells like a bug.
Besides: I already posted this in the support forum some days ago. Nobody answered.
#3
@
15 years ago
I never thought much about it but I have a similar issue with one of my plugins. It should run once a day to clean out a DB table and every now and then the cron job runs twice.
It's been happening for a while now, I mean at least a year if not two, so it's not related to a certain WordPress version. I will see if I can write some debugging stuff around my cron job and see what's happening.
#4
@
15 years ago
A few notes:
- The cronjob may not be called at the exact point in time specified. The cron system relies upon a user visiting the site to kick the cron off, for example, if there are no visitors between 1pm and 9pm, and a job was scheduled at 6pm, it'll run at 9pm.
- The Cron system "often" runs into issues related to running twice due to the locking not "working" 100% of the time.
- See the open Tickets related to Cron - I believe all the issues you've outlined above are mentioned in some of those tickets.
Please use the support forums or wp-hackers for figuring out if this is a bug with core or not.
If you're positive it's not caused by some other plugin or your own code, feel free to re-open this ticket.