Support Request – Product Selection Import API Concurrency & Update Limits

Hello Commercetools Team,

We are facing significant challenges while synchronizing Product Selections using the Import API and would appreciate your guidance or alternative recommendations.

Context

• ~5000 stores

• Each store has its own ProductSelection

• Each ProductSelection contains ~3000 products

• We are trying to use the Import API to submit full snapshots for each ProductSelection

• All ProductSelections are independent, but each store has frequent updates

Problems Observed

1. Hard update-action limit

Even though we chunk our ImportRequests to keep each resource under the 500 update-action limit, a single snapshot for a ProductSelection with 3000 items often calculates internal diffs (add/remove) that exceed the 500-action limit.
This results in: InvalidInput: The update actions count exceeds the limit of 500.

It seems that even well-formed 20-resource ImportRequests can fail if Commercetools detects a large diff for a single ProductSelection key.

2. Concurrency issues for the same ProductSelection key

When several resources in import container referencing the same ProductSelection key we observe:

• Imported operations going fail due to concurenncy issues

Questions

1. Is the Product Selection Import API designed to safely handle large snapshots (2000–5000 products) per resource?
   If not, what approach do you recommend for large-scale assortment synchronization?

2. Is there any recommended pattern to avoid concurrency conflicts on the same ProductSelection key in one import container (as we can have up to 20 reources in one container) ?

3. Is there a way to bypass or increase the 500 update-action limit for ProductSelections via Import API?
    

4. Is there an alternative recommended method for full snapshot syncing of ProductSelections at scale (thousands of selections × thousands of products each)?

What we are looking for

We want to understand:

• Whether our use case (large snapshots, high number of selections) is supported

• Best practices to implement stable and conflict-free synchronization

Thank you in advance for your help.
 

Best regards,
Jakub