Compute environments for AWS Batch

Job queues are mapped to one or more compute environments. Compute environments contain the Amazon ECS container instances that are used to run containerized batch jobs. A specific compute environment can also be mapped to one or more than one job queue. Within a job queue, the associated compute environments each have an order that's used by the scheduler to determine where jobs that are ready to be run will run. If the first compute environment has a status of VALID and has available resources, the job is scheduled to a container instance within that compute environment. If the first compute environment has a status of INVALID or can't provide a suitable compute resource, the scheduler attempts to run the job on the next compute environment.