向DCOS Spark提交多个实例的作业？

{
  "id": "my-spark-job",
  "cpus": 1,
  "mem": 1024,
  "instances": 3,
  "container": {
    "type": "DOCKER",
    "docker": {
      "image": "spark:latest",
      "network": "BRIDGE",
      "portMappings": [
        {
          "containerPort": 8080,
          "hostPort": 0,
          "protocol": "tcp"
        }
      ]
    }
  },
  "cmd": "spark-submit --class com.example.MySparkJob --master mesos://leader.mesos:5050 --deploy-mode cluster --executor-memory 1G --total-executor-cores 2 /path/to/your/spark/job.jar"
}

dcos spark run --submit-args="my-spark-job.json"