What is the meaning of Index, Default, sconnector, and ddg_automation in Cron Jobs

[mustafa_abdel a]

Hello Guys,

I am newbie in Magento and I want to understand the Cron Jobs please.

I know that Store operations that run according to a cron schedule include:

• Email
• Catalog Price Rules
• Newsletters
• XML Sitemap Generation
• Currency Rate Updates

In addition, you can configure the following to run according to a cron schedule:

• Order System Grid Updates and Reindexing
• Pending Payment Lifetime

But in Control Panel > Store > Configuration > Advanced > System:

  Cron configuration options for group: Index

  Cron configuration options for group: Default

  Cron configuration options for group: sconnector

  Cron configuration options for group: consumers

  Cron configuration options for group: ddg_automation

  Cron configuration options for group: yotpo_yotpo

I do not understand what is the meaning of index, default, sconnector, consumers, and ddg_automation.

yotpo may be clear because it related and used for yotpo Review

[Vimal Kumar]

Hi @mustafa_abdel a 

Cron group is name of the cron group. The group name doesn’t have to be unique. You can run cron for one group at a time. You can define multiple cron in a single group.

In store configuration, you can set configuration for pre defined cron groups.

For more info : Name of the cron group. The group name doesn’t have to be unique. You can run cron for one group at a time.

https://devdocs.magento.com/guides/v2.3/config-guide/cron/custom-cron.html 

I hope it will help you!

[mustafa_abdel a]

Thanks you  @Vimal Kumar 

If i want to create new cron job inside default cron group, but i want to set different schedule time for it, is it possible or i have to create custom cron group.

What is the difference between crontab.xml file and cron_groups.xml file ?

In crontab.xml file i see each cron job has its own schedules but in cron_groups.xml file it seems the schedules is general for all cron jobs in the group, which one to use ?

crontab.xml file:

<config>
<group id="default">
    <job name="<job_1_name>" instance="<classpath>" method="<method_name>">
        <schedule>* * * * *</schedule>
    </job>
    <job name="<job_2_name>" instance="<classpath>" method="<method_name>">
        <schedule>* * * * *</schedule>
    </job>
</group>
<group id="index">
    <job name="<job_3_name>" instance="<classpath>" method="<method_name>">
        <schedule>* * * * *</schedule>
    </job>
    <job name="<job_4_name>" instance="<classpath>" method="<method_name>">
        <schedule>* * * * *</schedule>
    </job>
</group>

cron_groups.xml file:

<config>
<group id="<group_name>">
    <schedule_generate_every>1</schedule_generate_every>
    <schedule_ahead_for>4</schedule_ahead_for>
    <schedule_lifetime>2</schedule_lifetime>
    <history_cleanup_every>10</history_cleanup_every>
    <history_success_lifetime>60</history_success_lifetime>
    <history_failure_lifetime>600</history_failure_lifetime>
    <use_separate_process>1</use_separate_process>
</group>

Also I do not understand what is the meaning of sconnector and ddg_automation cron group