DataNode启动异常"java.io.IOException: Cannot lock storage /i/dfs/dn. The directory is already lock"
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环境：CDH-5.10.2
1、以下为异常信息
2、发现问题
／data1、/data2、/data3都是挂载点，但是/i是个什么东西
3、df -h 查找挂载信息
发现／i确实一个挂载点，但是/data8是一个什么挂载点呢?
通过df -h /data8 查看
4、确定问题！
发现了没？/i和/data8挂载在同一个磁盘下，所以对一个磁盘操作两次，导致“The directory is already lock。
5、解决问题
- umount /i #取消/i这个挂载点
- 重新启动Datanode服务
参考网站：
https://discuss.pivotal.io/hc/en-us/articles/203055728-Datanode-fails-with-error-Cannot-lock-storage-xxx-The-directory-is-already-locked-
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