Problem

When trying to view  or  edit code reviews the following error is given:

The following can be found in the logs:

2015-06-01 09:54:43,391 ERROR [qtp1167186972-232199 anager.updateDetails] fisheye HibernateUtil-withRetriableTransaction - Unable to execute DefaultContentManager.updateDetails after 10 retries. Giving up
Caused by: java.sql.BatchUpdateException: Packet for query is too large (17668091 > 4194304). You can change this value on the server by setting the max_allowed_packet' variable.

Cause

This is caused either by the maximum allowed packet size of the MySQL server being too small, or when the InnoDB log file is too small (sometimes both).

Resolution

1. Shutdown Fisheye/ Crucible
2. Shutdown MySQL
3. Edit the my.cnf file (or my.ini in Windows)
4. Update the max_allowed_packet value to 64MB
5. Now update the innodb_log_file_size value to 256M
6. Delete the current innodb log files. This is required so that MySQL can resize them on restart (MySQL will fail to start without this step).
   1. These will be called ib_logfile* and are usually located in /var/lib/mysql on Linux
   2. If you're not sure where they are located, run lsof -c mysqld | grep ib_logfile with MySQL running to find them.
7. Start MySQL.
8. Start Fisheye/ Crucible.

9. Check if the issue persists.

   If the error continue to show up into the logs then repeat the above steps increasing both values to 512M instead of 64/128.