Best practices for Spark Variable update frequency?

[wgbartley]

If you want to reduce the sampling of the variable, you could only poll the variable on page load. Once the page is loaded, use Spark.publish() to post any changes of the variable and use SSE on the page to monitor those publishes. Just to be safe, you might want to poll the variable every 60 seconds or so (or less if you're extra paranoid).

@bko wrote an excellent tutorial on Spark.publish() and SSE:

Tutorial: Getting Started with Spark.publish()

Here’s a tutorial to get you started using Spark.publish(). Let’s imagine you want to monitor your core’s uptime, that is, how many hours, minutes, and seconds since the last time the core was reset or powered-up and view it on a web page that you can leave open all the time. You can use the millis() function to measure time and for this example, you can ignore the fact that it can wrap-around back to zero after many days. So you need two things, code for your Spark core and code for a web page…