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For rbac, before upgrading to 2.7.4, check for a blank user row in the user management tab in Admin tab. The login and email fields would be empty with a random id. Delete that row either through ui directly or by exec-ing into the configdb shell and run the following command. You can find the script to connect to rbacdb here
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./kfuse-postgres.sh kfuse-configdb-0 kfuse rbacdb
rbacdb=# DELETE FROM users where email ISNULL and login ISNULL;
DELETE 1 |
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