There is only one master Qlik Sense Scheduler Service (QSS) within a Qlik Sense site and it is always located on the central node, where the master Qlik Sense Repository Service (QRS) runs.
The master QSS handles all task administration (for example, which tasks to execute and when to execute a specific task).
When the time comes to execute a task, the master QSS sends the task ID to a slave QSS within the site. Which slave QSS to distribute the task ID to is determined by a load balancing operation performed by the master QSS.
When a slave QSS completes a task, it returns the task state (successful or fail) to the master QSS. The master QSS uses the task state to perform task chaining, which means that it uses the task state to determine if other events are affected by the state of the completed task and need to be executed. This can be configured in the Qlik Management Console (QMC).
If the slave QSS fails to perform the task, the master QSS repeatedly requests the same or another slave QSS to perform the task until it has been completed or until the maximum number of attempts has been reached.
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