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How to turn off safe mode

The command is:

bin/hadoopdfsadmin-safemodeleave

Reason:

When the distributed file system starts, there will be security mode at the beginning. When the distributed file system is in security mode, the contents in the file system cannot be modified or deleted until the end of security mode. The main purpose of security mode is to check the validity of data blocks on each datanode when the system starts, and copy or delete some data blocks according to the policy. The runtime can also enter the safe mode by command. In practice, when the system starts to modify and delete files, there will be an error prompt that the security mode does not allow modification. Just wait for a while