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python - 退出代码：fabric2 在执行远程 ssh 命令时出现 127

问题描述

我在使用fabric2命令模块时遇到了一个奇怪的行为。这些命令就像一个魅力：

connect = Connection(host=h, user=u ,connect_kwargs={"password":p})
connect.run('mkdir temp_streaming')
connect.put(m, "temp_streaming/mapper.py")
connect.put(r, "temp_streaming/reducer.py")

但说到这个：

input_path = input("Please choose the input of your program (on your HDFS File System) ")
output_path = input("Please choose a name for your output folder ")

main_command = str('yarn jar '+ jar_path+' -files mapper.py,reducer.py -mapper temp_streaming/mapper.py -reducer temp_streaming/reducer.py -input '+ input_path + ' -output '+ output_path)

connect.run(main_command)

我收到这个错误，我无法弄清楚：

bash: yarn: command not found
Traceback (most recent call last):
  File "__main.py__", line 77, in <module>
    main()
  File "__main.py__", line 65, in main
   RunMapReduce(mapper, reducer, jar_path)
  File "__main.py__", line 46, in RunMapReduce
   connect.run(main_command)
 File "<decorator-gen-3>", line 2, in run
 File "/usr/local/lib/python3.5/dist-packages/fabric2/connection.py", line 30, in opens
return method(self, *args, **kwargs)
 File "/usr/local/lib/python3.5/dist-packages/fabric2/connection.py", line 586, in run
return self._run(runner, command, **kwargs)
File "/usr/local/lib/python3.5/dist-packages/invoke/context.py", line 100, in _run
return runner.run(command, **kwargs)
File "/usr/local/lib/python3.5/dist-packages/invoke/runners.py", line 268, in run
return self._run_body(command, **kwargs)
File "/usr/local/lib/python3.5/dist-packages/invoke/runners.py", line 401, in _run_body
raise UnexpectedExit(result)
invoke.exceptions.UnexpectedExit: Encountered a bad command exit code!

Command: 'yarn jar /home/hadoop/hadoop/share/hadoop/tools/lib/hadoop-streaming-2.8.4.jar -files mapper.py,reducer.py -mapper temp_streaming/mapper.py -reducer temp_streaming/reducer.py -input /books/kafka_metamorphosis.txt -output /test'

Exit code: 127

Stdout: already printed

Stderr: already printed

当我使用 ssh 直接登录服务器并运行它时，即使这个 bash 命令有效，它也好像远程服务器不知道yarn命令。在我看来，它与这个库有关，但我无法用文档解决我的问题。

标签： pythonsshfabric

解决方案

我也遇到了这个问题：原来 Fabric 运行的 SSH 是一个非交互式 shell。$PATH包含 bin 路径的变量yarn设置为/etc/profileor ~/.bash_profile， or ~/.bashrc，这些都没有得到来源。

这是链接，以及一些解决方案。

就个人而言，我不喜欢玩这些文件 => 我刚刚所做的（​​在偶然发现此链接之前）是我使用了二进制文件的完整路径：/usr/bin/yarn [the rest of your command]

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