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  1. Migration Platform
  2. MIG-193

Missing attachments in Confluence after migrating via Assistant


    • 16
    • Major

      Issue Summary

      Some customers are facing a problem when migrating space via Confluence Migration assistant after the migration is successfully completed some attachments are missing in the destination Cloud site.

      Steps to Reproduce

      1. Migrate spaces using CCMA
      2. Verify the pages
      3. Random pages will be missing attachments

      Expected Results

      The Assistant would fail to migrate that particular space, forcing a re-migration for that particular space.

      Actual Results

      The spaces are migrated successfully, even if the assistant failed to read an attachment.

      The below exception is thrown in the atlassian-confluence.log file:

      com.atlassian.migration.agent.service.stepexecutor.attachment.AttachmentDataProvider$AttachmentDataRetrievalException: Could not get attachment 289965820 data

      You should see several of those exceptions in the logs.


      Remigrate the affected spaces or manually upload the files to the destination pages.

      You might need to clear out the MIG_ATTACHMENT table on your server to avoid previous results to interfere in your next runs.

      1. Shutdown Confluence
      2. Access your database
      3. Run


      This table is specific of the Migration Assistant, and it records the attachments migration.

            Unassigned Unassigned
            dbrito Daniel Brito [Atlassian]
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            16 Start watching this issue