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Parameter subscription – DMA/element restart behavior

Solved1.19K views12th April 2022enhanced services ParameterSubscriptionFilter subscriptions
2
Alex Johnson [SLC] [DevOps Advocate]836 12th April 2022 0 Comments

When a DMA restarts, what happens to parameter subscriptions? Do they have to be re-initialized on startup? Is it possible that on startup, these parameters would be not initialized for a moment until the parameter subscriptions are re-initialized?

When subscribing to a certain element’s parameters, what happens to the subscriptions when the element restarts/is stopped?

For reference, we have several hundred enhanced services subscribing to table parameters on multiple elements.

Alex Johnson [SLC] [DevOps Advocate] Selected answer as best 12th April 2022

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Tom Waterbley [SLC] [DevOps Catalyst]8.89K Posted 12th April 2022 3 Comments

Hi Alex, subscriptions are automatically recreated when the element (re)starts. Also after a DMA restart they are recreated. Nothing special needs to be done, you’ll just start receiving updates again.

Only if the process on the DMA that hosts the subscriptions is restarted (SLScripting in case of enhanced services), the subriptions need to be recreated. What I typically do is storing the subscription state in a variable (boolean). That variable automatically resets to false when the SLScripting is restarted, which means the subscriptions need to be recreated.

Alex Johnson [SLC] [DevOps Advocate] Posted new comment 12th April 2022
Alex Johnson [SLC] [DevOps Advocate] commented 12th April 2022

Thanks for your quick feedback!
Followup question: Isn’t SLScripting restarted on a DMA restart? What about during a DMA upgrade?

Tom Waterbley [SLC] [DevOps Catalyst] commented 12th April 2022

It’s indeed restarted on a DMA restart or upgrade. In that case the enhanced service will be restarted as well, and subscriptions should be recreated.
When the DMA that hosts the element you are subscribing on (not the one that contains the enhanced service) restarts, nothing needs to be done.

Alex Johnson [SLC] [DevOps Advocate] commented 12th April 2022

Gotcha, thanks again!

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