hadoop出現namenode running as process 18472. Stop it first.

hadoop出現namenode running as process 18472. Stop it first.等等，類別似幾個的出現。

namenode running as process 32972. Stop it first.
127.0.0.1: ssh: connect to host 127.0.0.1 port 22: No error
127.0.0.1: ssh: connect to host 127.0.0.1 port 22: No error
jobtracker running as process 81312. Stop it first.
127.0.0.1: ssh: connect to host 127.0.0.1 port 22: No error

解決的方法：說明你沒有啟動起來，所以在啟動之前你須要 在又一次啟動hadoop之前要先stop掉全部的hadoop服務。 

然后返回到正常啟動。

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