编辑“ hadoop-functions.sh”不能解决“ start-dfs.sh连接被拒绝的错误”

Question

当我运行start-dfs.sh时，得到了以下响应：

    Starting namenodes on [0.0.0.0]
    0.0.0.0: ssh: connect to host 0.0.0.0 port 9000: Connection refused
    localhost: ssh: connect to host localhost port 9000: Connection refused
    Starting secondary namenodes [0.0.0.0]
    0.0.0.0: ssh: connect to host 0.0.0.0 port 9000: Connection refused

如此处所述：edit hadoop-functions.sh，我尝试了这些步骤，但不能解决问题。如何解决这个问题。