5.managing hdfs

Managing HDFS

cd $HADOOP_HOMEsudo mkdir datasudo nano /usr/local/hadoop/data/small.txthello how are youhello I am fineI am very good

hdfs dfs -ls /hdfs dfs -mkdir /datahdfs dfs -mkdir /data/smallhdfs dfs -copyFromLocal /usr/local/hadoop/data/small.txt /data/small/small.txthdfs dfs -cat /data/small/small.txt

hdfs dfsadmin -report

[-cat [-ignoreCrc] <src> ...] [-chown [-R] [OWNER][:[GROUP]] PATH...] [-copyFromLocal [-f] [-p] <localsrc> ... <dst>] [-copyToLocal [-p] [-ignoreCrc] [-crc] <src> ... <localdst>] [-count [-q] <path> ...] [-cp [-f] [-p] <src> ... <dst>] [-get [-p] [-ignoreCrc] [-crc] <src> ... <localdst>] [-ls [-d] [-h] [-R] [<path> ...]] [-mkdir [-p] <path> ...] [-moveFromLocal <localsrc> ... <dst>] [-moveToLocal <src> <localdst>] [-mv <src> ... <dst>] [-put [-f] [-p] <localsrc> ... <dst>] [-renameSnapshot <snapshotDir> <oldName> <newName>] [-rm [-f] [-r|-R] [-skipTrash] <src> ...] [-rmdir [--ignore-fail-on-non-empty] <dir> ...]