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NameNode is not formatted

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my hadoop is based on CDH5.7 ,now my namenode has a wrong with " namenode is not formatted", i execute hadoop namenode -format ,it still say " namenode is not formatted", i also execute rm -rf /data/dfs/nn,rm -rf /tmp/hadoop_root/,then execute format, it still say is not formatted, can anyone tell me a solution? thanks ,my english is poor .sorry!
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