def is_app_id_running(app_id, client):

    all_app_ids = list_all_marathon_app_ids(client)
    return app_id.lstrip('/') in all_app_ids
create a done file to avoid re-doing the mon deployment
dataset/ETHPy150Open Yelp/paasta/paasta_tools/marathon_tools.py/is_app_id_running--crossover with--dataset/ETHPy150Open ceph/ceph-deploy/ceph_deploy/hosts/remotes.py/create_done_path