Ж
start_emr >> spark_app_ias >> ml_app_ias
start_emr >> spark_app_dv >> ml_app_dv
start_ec2 >> [ml_app_ias, ml_app_dv]
[spark_app_ias, spar_app_dv] >> terminate_emr
[ml_app_ias, ml_app_dv] >> terminate_ec2
[terminate_emr, terminate_ec2] >> finish_pipeline >> notify_users_by_email