Creates a Spot fleet request.
You can submit a single request that includes multiple launch specifications that vary by instance type, AMI, Availability Zone, or subnet.
By default, the Spot fleet requests Spot instances in the Spot pool where the price per unit is the lowest. Each launch specification can include its own instance weighting that reflects the value of the instance type to your application workload.
Alternatively, you can specify that the Spot fleet distribute the target capacity across the Spot pools included in its launch specifications. By ensuring that the Spot instances in your Spot fleet are in different Spot pools, you can improve the availability of your fleet.
For more information, see Spot Fleet Requests (http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-fleet-requests.html) in the Amazon Elastic Compute Cloud User Guide.