出現的錯誤如下：
hadoop@mike-VirtualBox:/usr/local/hadoop/hadoop$ ./sbin/start-dfs.sh 20/12/14 20:15:06 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable Starting namenodes on [localhost] localhost: namenode running as process 8844. Stop it first. localhost: datanode running as process 9057. Stop it first. Starting secondary namenodes [0.0.0.0] 0.0.0.0: secondarynamenode running as process 9312. Stop it first. 20/12/14 20:15:19 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
解決方法是首先停止啟動所有的節點，使用命令行啟動stop-all.sh腳本：
./sbin/stop-all.sh
然后再次重新啟動start-dfs.sh腳本，如下所示：
hadoop@mike-VirtualBox:/usr/local/hadoop/hadoop$ ./sbin/start-dfs.sh Starting namenodes on [localhost] localhost: starting namenode, logging to /usr/local/hadoop/hadoop/logs/hadoop-hadoop-namenode-mike-VirtualBox.out localhost: starting datanode, logging to /usr/local/hadoop/hadoop/logs/hadoop-hadoop-datanode-mike-VirtualBox.out Starting secondary namenodes [0.0.0.0] 0.0.0.0: starting secondarynamenode, logging to /usr/local/hadoop/hadoop/logs/hadoop-hadoop-secondarynamenode-mike-VirtualBox.out
這樣就成功啟動了！
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