hadoop balance 需要在退出安全模式的情况下进行

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执行balance的时候集群的安全模式需要关闭不然会有下面的错误信息，并且balance不会成功的执行。

Received an IO exception: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create file/system/balancer.id. Name node is in safe mode.
Use "hadoop dfsadmin -safemode leave" to turn safe mode off.
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:1239)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:1207)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:703)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:682)
        at sun.reflect.GeneratedMethodAccessor119.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:557)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1439)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1435)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1278)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1433)
. Exiting...
Balancing took 555.0 milliseconds

只需要执行 hadoop dfsadmin -safemode leave 就可以了。

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