This isolation allows the site to not attempt to evenly distribute the load for these select apps which will cause duplicative RAM use across the nodes in the cluster. This scenario can be ideal in situations where a site hosts a few, select large Qlik apps with the remaining apps in the site’s portfolio being of modest size. In this scenario, the Qlik administrator is intending to isolate specific, larger Qlik apps to a dedicated node in the cluster. Scenario 2 - Segregation of Larger Qlik Apps Refer to this document on Qlik Community for guidance on this scenario. In this scenario the administrator wishes to create an ad-hoc development node which only hosts unpublished Qlik apps separate from a production node which hosts published Qlik apps. Scenario 1 - Isolation of Production from Development Otherwise applications may be opened by the Central node’s Engine. Practically this means that when attempting to segregate / isolate apps using load balancing rules, the Central node’s Engine should not be configured as a Load Balancing Engine for any Virtual Proxy. For example, that apps which need to be migrated will be migrated by the Central node’s Engine. This rule cannot be modified due to architectural assumptions in the design of Qlik Sense Enterprise. Qlik Sense Enterprise has a default and unmodifiable rule named ResourcesOnCentralNode which means that the Central node will need to have all Qlik apps available on it. When a task is started, any node which has a Scheduler and Engine which has an app load balanced to it is eligable to execute this reload. While the scenarios which will be covered in this guide will focus on isolation of apps from the vantage of end users, the same principles can be applied to reload tasks. Apps 1-5 are likewise available to both back-end scheduler nodes. In this example the administrator has pinned apps 1 & 2 to the Consume 1 node and apps 3-5 on the Consume 2 node. An example of this can be illustrated like so: The net effect of this feature is that the administrator has the capability to isolate or segregate Qlik apps based on the needs of their site. This feature uses Load Balancing Rules to define the conditions under which Qlik apps should be available on a Qlik Engine. Inside of Qlik Sense Enterprise there is a feature which allows for the administrator to customize the distribution of apps in their site across Qlik Engines. What is Load Balancing in Qlik Sense Enterprise?
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