Confluence XML restore fails because the packet for query is too large
Platform Notice: Data Center - This article applies to Atlassian products on the Data Center platform.
Note that this knowledge base article was created for the Data Center version of the product. Data Center knowledge base articles for non-Data Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Problem
An XML backup fails to restore.
Diagnosis
The following appears in the atlassian-confluence.log:
-- referer: http://localhost:8090/setup/setup-restore-start.action | url: /setup/setup-restore.action | userName: anonymous | action: setup-restore
com.atlassian.confluence.importexport.ImportExportException: Unable to complete import: Error while importing backup: could not insert: [com.atlassian.confluence.core.BodyContent#787560]
Caused by: com.mysql.jdbc.PacketTooBigException: Packet for query is too large (17825792 > 16777216 ). You can change this value on the server by setting the max_allowed_packet' variable.
Cause
The packet query size exceeds the maximum allowed size that is set in the database configuration, therefore XML restore process will fail.
Resolution
In order to resolve this, you will need to check the max_allowed_packet set within the MySQL server:
- Stop Confluence.
Ensure that the size max_allowed_packet parameter is set to 256MB per our Database Setup For MySQL guide:
max_allowed_packet =256MRestart the Mysql service.
- Restart Confluence.