From the discussion of HDFS-9698, it might be nice to allow the balancer to run as a daemon and login from a keytab.
Long running Balancer should renew TGT
TestBalancer failing intermittently because of not reseting UserGroupInformation completely
Long running balancer may fail due to expired DataEncryptionKey
fuse_dfs to support keytab based login
Allow reseting KerberosName in unit tests