'Returns a list of the available reserved node offerings by
Amazon Redshift with their descriptions including the node
type, the fixed and recurring costs of reserving the node and
duration the node will be reserved for you. These descriptions
help you determine which reserve node offering you want to
purchase. You then use the unique offering ID in you call to
PurchaseReservedNodeOffering to reserve one or more nodes for
your Amazon Redshift cluster.
For more information about managing parameter groups, go to
`Purchasing Reserved Nodes`_ in the Amazon Redshift Management
Guide .
:type reserved_node_offering_id: string
:param reserved_node_offering_id: The unique identifier for the
offering.
:type max_records: integer
:param max_records: The maximum number of response records to return in
each call. If the number of remaining response records exceeds the
specified `MaxRecords` value, a value is returned in a `marker`
field of the response. You can retrieve the next set of records by
retrying the command with the returned marker value.
Default: `100`
Constraints: minimum 20, maximum 100.
:type marker: string
:param marker: An optional parameter that specifies the starting point
to return a set of response records. When the results of a
DescribeReservedNodeOfferings request exceed the value specified in
`MaxRecords`, AWS returns a value in the `Marker` field of the
response. You can retrieve the next set of response records by
providing the returned marker value in the `Marker` parameter and
retrying the request.'

def describe_reserved_node_offerings(self, reserved_node_offering_id=None, max_records=None, marker=None):

    params = {}
    if (reserved_node_offering_id is not None):
        params['ReservedNodeOfferingId'] = reserved_node_offering_id
    if (max_records is not None):
        params['MaxRecords'] = max_records
    if (marker is not None):
        params['Marker'] = marker
    return self._make_request(action='DescribeReservedNodeOfferings', verb='POST', path='/', params=params)
