1. wdl数据类型：

• 列表文件类型：
  File file = “/tmp/a.txt”

• 列表字符串类型：
  String str = “abc”

注意点：路径参数：使用String
当task输出是一个路径时：

output {
        File metadata_result = "metadata.tsv"
        File data_dir = "data"
        File fqc_dir = "data1"
        String fqc_dir_str = "${fqc_dir}"
    }

先使用File data_dir = "data", 才能接收到 "data"的完整路径， 但是在后续使用当中需要将File类型的路径转化成 String, String fqc_dir_str = "${fqc_dir}",

因为： 在File类型里，callcaching hash不支持File类型的path,
如果在输出里用File接收，在输入里用String,使用，则会导致输入的hash值判定为新值，该步骤就无法参与重启

后续编写WDL测试规范：

1. 功能测试：
2. 重启测试

call-caching {

  enabled = true

}

backend {
  default = TESK

  providers {
    TESK {
      actor-factory = "cromwell.backend.impl.tes.TesBackendLifecycleActorFactory"
      config {
        root = "/cephfs_data/genostack_v3/genostack_cromwell/tmp/cromwell-executions"
#         root = "ftp://192.168.0.135/pub/cromwell-executions"
        dockerRoot = "/cromwell-executions"
        endpoint = "http://192.168.0.135:8080/ga4gh/tes/v1/tasks"
       # endpoint = "http://192.168.0.135:31903/v1/tasks"
        glob-link-command = "ls -L GLOB_PATTERN 2> /dev/null | xargs -I ? ln -s ? GLOB_DIRECTORY"
      }
    }
  }
}



docker {
  hash-lookup {
    # Set this to match your available quota against the Google Container Engine API
    #gcr-api-queries-per-100-seconds = 1000

    # Time in minutes before an entry expires from the docker hashes cache and needs to be fetched again
    #cache-entry-ttl = "20 minutes"

    # Maximum number of elements to be kept in the cache. If the limit is reached, old elements will be removed from the cache
    #cache-size = 200

    # How should docker hashes be looked up. Possible values are "local" and "remote"
    # "local": Lookup hashes on the local docker daemon using the cli
    # "remote": Lookup hashes on docker hub, gcr, gar, quay
    method = "local"
  }
}

注意： docker.hash-lookup.method 要为local，等于remote时，cromwell会从远程仓库去取docker的hash值，一旦获取失败，callcaching就会关闭，导致后续所有的caching 和hash Miss, 无法使用重启

1. 安装支持gpu版本的docker
2. 配置docker和gpu驱动；
3. 创建k8s对gpu支持；