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jlasso71
Level 2
June 9, 2025
Solved

CJA - Dataset backfill Person ID update

  • June 9, 2025
  • 1 reply
  • 716 views

Hi there,

 

We have a connection built in CJA with some datasets linked to it:

 

Dataset 1 - Person ID: identityMap<primary>

Dataset 2 - Person ID: identityMap<ECID>

 

With this configuration, we found out we are breaking sessions in dataset 1 when users log in and Email is considered as Primary ID.

 

In order to solve this, we changed the Person ID to identityMap<ECID> in dataset 1 and requested a backfill. However, we still have Emails as Person IDs in the events.

 

What was wrong? Is not Backfill functionality supposed to overwrite Person ID configuration? How could we solve this issue?

 

Best regards,

Best answer by jlasso71

Hi @jlasso71 thank you for clarifying. On your connections screen, do you see that the backfill has finished? Historic backfills can take up to 30 days, I believe, to complete the backfill process. If that backfill is still in process, that may solve the issue. If it's not, I'd suggest reaching out to the Adobe support team for assistance.


Hi @josh__stephens , yes, the backfill had finished. 

 

Ultimately, we resolved the issue by removing the dataset from the connection, reingesting it again, and initiating a new backfill. It turned out the solution was not as straightforward as the documentation suggested.

 

Thanks for your help!

1 reply

Josh__Stephens
Community Advisor
Josh__StephensCommunity Advisor
Community Advisor
June 9, 2025

Hi @jlasso71 did you remove the existing dataset before bringing in the new backfill?

J
jlasso71Author
Level 2
June 10, 2025

Hi @josh__stephens ,

 

No, we did not remover the existing dataset before bringing in the new backfill. Is this a requirement for this action?

 

Thanks!

Josh__Stephens
Community Advisor
Josh__StephensCommunity Advisor
Community Advisor
June 10, 2025

Do you have two different datasets with the data? Or one dataset? I haven't done this specifically, but what I can find, it seems if you change the Person ID for an existing dataset, it is re-ingested into CJA. (See link below)

I'd double check your connection to determine if there are one or two dataset. I'd also suggesting validating that the Person ID is set correctly on the dataset(s). If you have multiple datasets and each has a separate Person ID, you'll see both in CJA.

https://experienceleague.adobe.com/en/docs/analytics-platform/using/cja-connections/create-connection#edit-a-dataset:~:text=associated%20data%20views.-,Re%2Dingest%20data,-You%20sometimes%20require

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