@staticmethod
def _split_cluster_host(cluster_host):
    """Split a string with list of hosts and make a list of tuples out of it.
        For example, string
        *192.168.90.2:3306,192.168.90.3:3306,192.168.90.4:3306*
        will be converted into list:

.. code-block:: python

    [
        (192.168.90.2, 3306),
        (192.168.90.3, 3306),
        (192.168.90.4, 3306),
    ]


:param cluster_host: String with list of host:port pairs
:type cluster_host: str
:return: list of tuples (host, port)
:rtype: list(tuple)
        """
    result = []
    for item in cluster_host.split(','):
        host, port = item.split(':')
        result.append((host, int(port)))
    return result
