无法运行程序“-files”（在目录“.”中）：错误=2，没有这样的文件或目录答案

【问题标题】：Cannot run program "-files" (in directory "."): error=2, No such file or directory无法运行程序“-files”（在目录“.”中）：错误=2，没有这样的文件或目录
【发布时间】：2016-04-27 19:38:54
【问题描述】：

我正在尝试使用 aws sdk ruby 为使用 hadoop 的 Amazon ElasticMapReduce 服务运行一个步骤，虽然我可以创建集群和步骤，但该步骤总是失败，但在使用 Web 界面手动设置时不会失败

emr = Aws::EMR::Client.new
    cluster_id = "*******"
    resp = emr.add_job_flow_steps({
      job_flow_id: cluster_id, # required
      steps: [ # required
        {
          name: "TestStep", # required
          action_on_failure: "CANCEL_AND_WAIT", # accepts TERMINATE_JOB_FLOW, TERMINATE_CLUSTER, CANCEL_AND_WAIT, CONTINUE
          hadoop_jar_step: { # required
            jar: 'command-runner.jar',
            args:[
                "-files",
                "s3://source123/mapper.py,s3://source123/source_reducer.py",
                "-mapper",
                "mapper.py",
                "-reducer",
                "source_reducer.py",
                "-input",
                "s3://source123/input/",
                "-output",
                "s3://source123/output/"
            ]
          },
        },
      ],
    })

我得到的错误是这样的

Cannot run program "-files" (in directory "."): error=2, No such file or directory

有什么线索吗？

【问题讨论】：

标签： ruby-on-rails ruby hadoop amazon-web-services emr

【解决方案1】：

似乎添加hadoop-streaming的工作如下

emr = Aws::EMR::Client.new
    cluster_id = "*******"
    resp = emr.add_job_flow_steps({
      job_flow_id: cluster_id, # required
      steps: [ # required
        {
          name: "TestStep", # required
          action_on_failure: "CANCEL_AND_WAIT", # accepts TERMINATE_JOB_FLOW, TERMINATE_CLUSTER, CANCEL_AND_WAIT, CONTINUE
          hadoop_jar_step: { # required
            jar: 'command-runner.jar',
            args:[
                "hadoop-streaming",
                "-files",
                "s3://source123/mapper.py,s3://source123/source_reducer.py",
                "-mapper",
                "mapper.py",
                "-reducer",
                "source_reducer.py",
                "-input",
                "s3://source123/input/",
                "-output",
                "s3://source123/output/"
            ]
          },
        },
      ],
    })

【讨论】：