Making changes to the cdt which is already in use

Question

Suppose i am using a CDT in my process model and i spawn a few 100-200 instances of this process model,Later once these instances are in inflight mode i realise i missed out a field in my CDT which was very important one .Then i make changes to the cdt and publish the new cdt . The later instances which i spawn will point to the newer version of the cdt .But the older instances 100-200 will still keep pointing to the older version of the CDT . In such case what measures can we take to minimise the loss because i cant just cancel all the older instances and request the client to create new instances 
 Please suggest

Sandeep Deshmukh · Accepted Answer

Hi @rohitr303, 
I have no idea what type of data and process it is but I guess the only option you have is to make a changes manually on existing inflight instances. As you know cdt modification will never update existing instances.

Sandeep Deshmukh · Answer

Hi rohitr303 , 
 
I am not sure for you what convincing answer is. But I can help you on this if you are not satisfied with above answer. 
 
We have "IFM Manager" smart service available to update : 
- Target process models for mass update, or a specific instance 
- Update PV and CDT values 
- Reassign Tasks 
- Start Tasks 
- Cancel Tasks 
- Restart Tasks 
- Start task if no running instance 
- Update process instance security 
- Add new PVs to an instance 
- Batching of instances. 
 
Please PFB url : 
 forum.appian.com/.../summary 
 
Hope this will help. :) 
 
Thanks, 
Sandeep

Brazil Vibanco · Answer

Hi rohitr303 , 
 
I can suggest you to focus your implementation as a Case Management, where you will build every phase or every action as a new subpocess, this will help you when you change your cdt, every new instance will get the new structure, even you have started the process before. 
 
By this frame, you will have an scalable platform that you could adapt every time in your needs. 
Here you can see a little page about it. I hope it could help you. 
 www.appian.com/.../