redis/redis-py · error · DataError

Passing a host requires passing a port, and vice versa

Error message

Passing a host requires passing a port, and vice versa

What it means

Error "Passing a host requires passing a port, and vice versa" thrown in redis/redis-py.

Source

Thrown at redis/cluster.py:3018

        If host is passed without port, or vice versa, a DataError will be
        thrown.
        :type cluster: RedisCluster
        :type node: ClusterNode
        :type host: str
        :type port: int
        """
        if node is not None:
            # node is passed by the user
            self._raise_on_invalid_node(cluster, node, node.host, node.port)
            pubsub_node = node
        elif host is not None and port is not None:
            # host and port passed by the user
            node = cluster.get_node(host=host, port=port)
            self._raise_on_invalid_node(cluster, node, host, port)
            pubsub_node = node
        elif any([host, port]) is True:
            # only 'host' or 'port' passed
            raise DataError("Passing a host requires passing a port, and vice versa")
        else:
            # nothing passed by the user. set node to None
            pubsub_node = None

        self.node = pubsub_node

    def get_pubsub_node(self):
        """
        Get the node that is being used as the pubsub connection
        """
        return self.node

    def _raise_on_invalid_node(self, redis_cluster, node, host, port):
        """
        Raise a RedisClusterException if the node is None or doesn't exist in
        the cluster.
        """
        if node is None or redis_cluster.get_node(node_name=node.name) is None:

View on GitHub (pinned to da03cdc7e8)

When it happens

Trigger: Thrown at redis/cluster.py:3018 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of redis/redis-py@da03cdc7e8 (2026-08-04). Data as JSON: /data/errors/627a83637c509908.json. Report an issue: GitHub.