关闭虚拟机之后重启hadoop，想要用删除之前在hdfs运行的output文件，显示：
Sometime after starting, hadoop will enter safe mode for some reason, you can force hadoop leave the safe mode with below comman
The ratio of reported blocks 0.0000 has not reached the threshold 0.9990. Safe mode will be turned off automatically.如果设为1则HDFS永
FFFFFF. FFFFCC. FFFF99. FFFF66. FFFF33. FFFF00. CCFFFF. CCFFCC. CCFF99. CCFF66. CCFF33. CCFF00. 99FFFF. 99FFCC. 99FF99. 99FF66.
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