Back in 2016 I wrote a post on running a reload from a Qlik Sense mashup. To recap, I described two ways:
- call the Engine API method doReload(). Use this in Qlik Sense desktop, since it’s the only method available.
- use the repository call App reload optionally with the help of the callRepository method. This is of course only relevant in a server installation.
You’ll find code examples in my original post, and also how to know if you are running in server or desktop.
What happens when you use /app/reload ?
While this method works well in some scenarios, like when you just want to run one reload of an app ASAP, it has some limitations. Behind the scenes Qlik will create a very simple task for you, and try to start it immediately. The task will look like this:
Very basic, just an app, a name, an the default Task session timeout of a day (or 1440 minutes). No triggers, since the task is started by the REST call, no tags, no custom properties. And, perhaps most important, no retries. This means that if you create a series of reloads this way, most likely only the first few will succeed, the rest will fail since there is no engine instance available.
Another method to start a reload
This will create the reload task the way we want it and return the id for the task, whish we can use to start it. That’s just another call to the Repository like this:
And that’s it. A little more code than the second method, but much more control over what we get.