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Ocata:What does this error message mean?

Hi.Everyone.

When I tried command below,the following error message appeared.

■Command: # su -s /bin/sh -c "nova-manage cell_v2 discover_hosts --verbose" nova

・Mentioned below

OpenStack Installation Guide 15.0>Compute service>Install and configure components>add the compute node to the cell database No.2

URL:link text

■Error: /usr/lib/python2.7/site-packages/pymysql/cursors.py:166: Warning: (1831, u'Duplicate index block_device_mapping_instance_uuid_virtual_name_device_name_idx. This is deprecated and will be disallowed in a future release.')result = self._query(query)/usr/lib/python2.7/site-packages/pymysql/cursors.py:166: Warning: (1831, u'Duplicate index uniq_instances0uuid. This is deprecated and will be disallowed in a future release.')result = self._query(query) *

⇒What does this error message mean? (If this message doesn't critical,it doesn't matter.)

Best regards.

<Environment>OS:CentOS7