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davidea
August 5, 2025
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Call integration multiple times in parallel

  • August 5, 2025
  • 10 replies
  • 1 view

I have a scenario where I need to call an integration multiple times for an array of items.

That needs to be done in parallel as the result is then presented to the user in a form.

The problem I have is that I need to save the output of the function (the output of the api is then processed further)

in a process variable, and I am  not sure how to do that. If I set a node to run multiple times with an output

variable, when all the instances end it will have saved only the result of the first instance (which is a CDT), while I would

like the output variable to contain an array with all the replies. How can this be done?

10 replies

harshas2775
harshas2775
August 5, 2025

You need a multiple output variable to store outputs of integration in an array. After a successful integration run, in the output node instead of using Operator 'is stored as', create a custom output using operator 'is stored at index' of the output variable. 

Example, if you have 5 array items then as per my understanding process will call 5 integration nodes or the same integration nodes 5 times using MNI. Think of each node as index 1 to 5 of integrations and save output at respective index. For 3rd integration store output at index 3 of output variable and so on. If using MNI you can use tp!instanceIndex as well to store at particular index of output variable.

However I have never tried this scenario with an MNI yet so after trying you can let me know how it goes! 

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davideaAuthor
August 5, 2025

Thank you Harsha, that indeed does the trick (I can use the "is appended to" option). I was oblivious of this as I never used it before

harshas2775
harshas2775
August 5, 2025

Yeah is appended to also works the same way by appending each execution result after previous one ! Glad its working now! 

stefanhelzle0001
stefanhelzle0001
August 5, 2025

Did you consider to do that in an expression instead of process nodes?

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davideaAuthor
August 5, 2025

Wouldn't a for-each cycle cause the integrations to be called one by one though? 

stefanhelzle0001
stefanhelzle0001Answer
August 5, 2025

https://docs.appian.com/suite/help/25.2/expressions-parallel-evaluation.html

    shubhama926776
    shubhama926776
    August 5, 2025

    Enable MNI on the Call Integration node, point it at your input array, then in the Data tab set the custom output to your array-typed process variable and choose “Appended as” (not “Stored as”); System will automatically add each instance’s result to that variable so, when all instances finish, you have one array containing every response.

    D
    davideaAuthor
    August 5, 2025

    Thank you, I have never used this feature before strangely enough, I never needed it.

    mathieud0001
    mathieud0001
    August 5, 2025

    I would use an expression like Stefan has suggested. Much easier to debug and troubleshoot IMO.

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