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Class org.apache.hadoop.hdfs.tools.DFSAdmin

Added Methods
int printTopology() Display each rack and the nodes assigned to that rack as determined by the NameNode in a hierarchical manner.
int refreshUserToGroupsMappings() Refresh the user-to-groups mappings on the NameNode
int restoreFaileStorage(String) Command to enable/disable/check restoring of failed storage replicas in the namenode.