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hadoop node safemode

safemode模式

NameNode在启动的时候首先进入安全模式，如果datanode丢失的block达到一定的比例（1-dfs.safemode.threshold.pct），则系统会一直处于安全模式状态即只读状态。

 

hadoop dfsadmin -safemode leave

有两个方法离开这种安全模式

1. 修改dfs.safemode.threshold.pct为一个比较小的值，缺省是0.999。

2. hadoop dfsadmin -safemode leave命令强制离开

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