Confluence XML restore fails because the packet for query is too large

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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:

  1. Stop Confluence.
  2. Ensure that the size max_allowed_packet parameter is set to 256MB per our Database Setup For MySQL guide:

    max_allowed_packet =256M       
  3. Restart the Mysql service.

  4. Restart Confluence.


Last modified on Jun 1, 2021

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