Few things to check 1) Are the datanodes actually running 2) Are those datanodes setup with a different port for some reason? 3) Double check your dfs.exclude and dfs.include files too , Are you sure that other 1/3 of datanodes are running? You may also want to make sure the NN isn't rejecting those datanodes from joining the cluster. Check the dfs.include and dfs.exclude files
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