Is there a way we can update a CDT on all running process instances?

RE: Is there a way we can update a CDT on all running process instances?

janakik — Fri, 04 Sep 2015 09:39:32 GMT

Thanks. We got the issue resolved.

RE: Is there a way we can update a CDT on all running process instances?

Eduardo Fuentes — Thu, 03 Sep 2015 10:50:04 GMT

Maybe a set of screenshots will help me understand the root cause of your issue.

RE: Is there a way we can update a CDT on all running process instances?

janakik — Wed, 02 Sep 2015 18:18:58 GMT

Hi Eduardo
1. I have added new task inputs to a task and published PM.
2. Upgraded the active processes to the current version of PM using Process Upgrade plugin.
3. I could see the new task inputs added for the active instances.
However when i open the task from tempo i see an error "Could not find variable 'ac!'". (ACP value is getting from a rule).
Here i cannot use ACP as a new parameter because it will impact the existing instances so am directly passing value to ACP from the rule.

Why does the task throws an error even though the task is updated with new input?

Thanks!

RE: Is there a way we can update a CDT on all running process instances?

sairakeshn — Tue, 05 May 2015 18:40:51 GMT

Passing CDT by reference is not one of the recommended best practice. There are very few use cases for passing CDT by reference. Instead of passing CDT by reference, pass it by value (create a new variable of same CDT type in output section) and do the process upgrade. You should do this before changin the CDT and doing impact analysis.

RE: Is there a way we can update a CDT on all running process instances?

Brandon — Tue, 05 May 2015 01:21:23 GMT

thanks for that. that is exactly my issue now. the processes still throw errors because we have the CDT passed by reference through a number of sub processes. Any idea how we can resolve this?

RE: Is there a way we can update a CDT on all running process instances?

sairakeshn — Mon, 04 May 2015 23:59:59 GMT

Just an FYI, If your objective of updating CDT on all running instances is to make sure that existing processes don't break anywhere, you don't necessarily have to update CDT. The existing instances will only break at the places where you have passed a CDT by reference into any of the sub process.

RE: Is there a way we can update a CDT on all running process instances?

Eduardo Fuentes — Mon, 04 May 2015 04:30:03 GMT

Just keep in mind that as explained here: ttps://forum.appian.com/suite/help/7.9/Process_Upgrade.html#Requirements_for_Upgrade

"For example, if the target model has a PV (`pv!person`) of type Person^2 and the source model has the same PV but of type Person, the process will not upgrade because the CDT types are different."

Therefore a possible solution is to add add a process variable of the new type leaving the existing one pointing to version ^X of the CDT then remap nodes to point to the new variable which will be indeed of the updated verison.

For backwards compatibility in processes Appian doesn't let you update Person^2 to Person since there can be places where the mappings to fields won't match.

RE: Is there a way we can update a CDT on all running process instances?

Tim — Mon, 04 May 2015 04:13:44 GMT

Check out the Process Upgrade plugin which should achieve what you're requiring:
forum.appian.com/.../summary