High CPU load. A lot of processes interface_async_executor.php (dnssec/library/EventListener)

Symptoms

• High CPU load on a server with a great number of domains (a few hundreds) and DNSSEC extension installed.

• There are a log of the processes like below during Plesk Daily Maintenance task:

  CONFIG_TEXT: /usr/local/psa/admin/bin/event_handler -i -u psaadm /usr/local/psa/admin/bin/php -- -f /usr/local/psa/admin/plib/scripts/interface_async_executor.php -- EventListener /usr/local/psa/admin/plib/modules/dnssec/library/EventListener.php handleEvent admin

Cause

This is a DNSSEC extension bug with ID #EXTDNSSEC-57 which will be fixed in future extension updates.

Resolution

As a temporary workaround apply the following hotfix:

1. Connect to the server via SSH

2. Backup the file /usr/local/psa/admin/plib/modules/dnssec/library/EventListener.php:

   # mv /usr/local/psa/admin/plib/modules/dnssec/library/EventListener.php{,.orig}

3. Download the archive with the patched file, unpack it and replace the backed up file with the patched file:

   # wget https://plesk.zendesk.com/hc/article_attachments/360044593553/EventListener.tar.gz
   # tar -zxvf ./EventListener.tar.gz
   # mv ./EventListener.php /usr/local/psa/admin/plib/modules/dnssec/library/