Tuesday, June 13, 2017

HDFS (hadoop distrubuted file system) commands

1)Start-all.sh  -to start all
2) ->Hadoop
3) Hadoop namenode –format

To start hdfs
1)           Start-dfs-sh to start hadoop i.e name node,data node ,secondary node
2)           Start-mapred.sh to start job tracker and task tracker
Admin commands
Dfsadmin
Mradmin
Fsck
Balancer
Distep
Fs
Pipes
Job
Queue
Jar

Developer commands
1)           Hadoop fs
2)           Hadoop fs –ls /
3)           Hadoop –lsr
4)           Hadoop fs –mkdir /newfolder
5)           Hadoop fs –ls foldername
6)           Hadoop fs – put /etc/hostname /etc/hosts/kalian
7)           Jps
8)           Hadoop fs –cp /folder/host1 /folder/host2
9)           put – local to hdfs
10)   cp,mv – hdfs to hdfs
11)   get – hdfs to local
12)   rm
13)   hadoop fs –chown -  r    (read permissions to other user)
14)   hadoop fs –cat
15)   hadoop fs –text
16)   hadoop fs –du
17)   hadoop fs –dus

18)   hadoop –help

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