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ambari dependency on postgresql

Installed Ambari on RHEL 7.3. It installed posgresql rpm packages. But used MySQL database and installation and setup completed successfully.

Before starting Ambari-server removed postgresql packages with --nodeps option as they are not used.

But ambari-server fail to start with the below error though MySQL is used as backend database.

ambari_commons.exceptions.FatalException: 'Fatal exception: Cannot find postgresql-setup script., exit code 1'

Is it possible to get around this error? We have to delete postgresql rpms.