Multiple instances of the cron running at the same time

[wyrix]

Since our upgrade to 2.2.1 the number of crons running for the webshop is getting higher and higher. It looks like a new cron instance is started while the old one is not finished yet;

USER PID %CPU %MEM VSZ RSS TTY Ss 18:56 0:05 /opt/plesk/php/7.0/bin/php -f httpdocs/bin/magento -- cron:run
USER PID %CPU %MEM VSZ RSS TTY Ss 18:57 0:04 /opt/plesk/php/7.0/bin/php -f httpdocs/bin/magento -- cron:run
USER PID %CPU %MEM VSZ RSS TTY Rs 18:58 0:03 /opt/plesk/php/7.0/bin/php -f httpdocs/bin/magento -- cron:run

I think the new instance should not start when there's already an instance running? Does anyone have a clue what's wrong or how to fix this?

[Damian Culotta]

Hi @wyrix,

Can you check if you have, currently, the configurations as the documentation recommends?

http://devdocs.magento.com/guides/v2.2/config-guide/cli/config-cli-subcommands-cron.html

[wyrix]

Hi Damian,

Yes, they are setup as recommended except the fact that we log everything in the Plesk logs instead of custom log files;

httpdocs/bin/magento cron:run	 * * * * *
httpdocs/update/cron.php	 * * * * *
httpdocs/bin/magento setup:cron:run setup:cron:run	 * * * * *

[wyrix]

I've found out that it looks like the same issue as mentioned here;

https://github.com/magento/magento2/issues/11002

I think running this query fixed it for me, but I will monitor it for a while to see if it's realy fixed now.

delete from cron_schedule where scheduled_at < date_sub(now(), interval 1 hour);

[JUV_LANO]

Hi @wyrix  did running the query fixed the issue? I am having same issues.