[Hadoop] cannot create directory/mdrill/tablelist/fact_seller_all_d. Name node is in safe mode.

When executing the mdrill command to create a table, the following error is reported (the blue part is the key ):

[[email protected] bin]$ ./bluewhale mdrill create ./create.sql higo execute [create, ./create.sql]Exception in thread "main" org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create directory /mdrill/tablelist/fact_seller_all_d. Name node is in safe mode.The ratio of reported blocks 0.0000 has not reached the threshold 0.9990. Safe mode will be turned off automatically.        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInternal(FSNamesystem.java:1761)        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:1735)        at org.apache.hadoop.hdfs.server.namenode.NameNode.mkdirs(NameNode.java:542)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)        at java.lang.reflect.Method.invoke(Method.java:616)        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:508)        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959)        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955)        at java.security.AccessController.doPrivileged(Native Method)        at javax.security.auth.Subject.doAs(Subject.java:416)        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:953)        at org.apache.hadoop.ipc.Client.call(Client.java:740)        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220)        at com.sun.proxy.$Proxy0.mkdirs(Unknown Source)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)        at java.lang.reflect.Method.invoke(Method.java:597)        at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)        at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)        at com.sun.proxy.$Proxy0.mkdirs(Unknown Source)        at org.apache.hadoop.hdfs.DFSClient.mkdirs(DFSClient.java:912)        at org.apache.hadoop.hdfs.DistributedFileSystem.mkdirs(DistributedFileSystem.java:262)        at org.apache.hadoop.fs.FileSystem.mkdirs(FileSystem.java:1120)        at com.alimama.mdrill.topology.MdrillMain.createtable(MdrillMain.java:136)        at com.alimama.mdrill.topology.MdrillMain.main(MdrillMain.java:45)        at com.alimama.bluewhale.core.drpc.Mdrill.main(Mdrill.java:11)

Cause: When the Distributed File System is started, the security mode starts. When the Distributed File System is in security mode, the content in the file system cannot be modified or deleted until the security mode ends. The security mode is mainly used to check the validity of data blocks on each datanode when the system starts, and to copy or delete some data blocks as required by the policy. You can also enter security mode through commands during runtime. In practice, when the system starts, an error message indicating that the file cannot be modified in security mode is displayed when you modify or delete the file. You only need to wait for a while.

If you want to leave security mode immediately, run the following command:

[[email protected] bin]$ hadoop dfsadmin -safemode leaveSafe mode is OFF

Execute "mdrill" to create the table.