Katalyst: Re-opening a finalized Katalyst experiment gives an error: arcus_source is not explicitly false

Description

• Users attempt to re‑open a previously finalized experiment in Katalyst and receive an error similar to:
  Cannot reopen experiment <KAT ID>: arcus_source is not explicitly false
• The associated ReopenExperiment logs show:
  • Successful retrieval of the main experiment record.
  • Warnings about missing or inconsistent attachment records.
  • The exception above, followed by failure of the re‑open operation.
• In some re‑open attempts, logs indicate that the experiment opens in read‑only mode instead of fully re‑opening.
• Additional attachments may have been added to the experiment after finalization.

Solution

• Review the ReopenExperiment logs for the affected KAT ID to confirm:
  • Whether attachment records (e.g., <KAT ID>-Attachments) are missing or inconsistent.
  • Whether multiple re‑open attempts show different behavior (e.g., error vs read‑only open).
• Validate the experiment’s metadata in Spectrus DB and any associated attachment records to ensure:
  • The arcus_source property is either not present or explicitly set to false for experiments that are eligible to be re‑opened.
  • Required attachment records exist and are not corrupted.
• If the problem is reproducible in a test environment:
  • Reproduce the sequence of operations (finalization, attaching additional data, re‑open).
  • Work with Technical Support team to obtain or apply a fix in the ReopenExperiment logic to handle experiments missing attachment records or having unexpected arcus_source values.
• As a short‑term workaround, if re‑open is not possible:
  • Clone or recreate the experiment using the existing data and re‑run processing in the new experiment.
  • Keep the original finalized experiment as an immutable record and reference it from the new one.

If nothing helps, contact Technical Support.