For setting the replication factor, we use below command
hadoop fs -setrep 2 file_name
Where 2 is the new replication factor which we want to set and file_name is the file whose replication we want to change.
If you want to wait till the process gets over, use -w and if you want to set the replication for entire directory please use an option -R on command line. For example, the following command will set the replication factor of 2 of all the files in a directory 'mydir' and it will wait for the completion:
hadoop fs -mkdir mydir
hadoop fs -put wordcountscript.sh mydir
hadoop fs -setrep -R -w 2 mydir
Here is the output:
Replication 2 set: mydir/wordcountscript.sh
Waiting for mydir/wordcountscript.sh ... done
In the previous step, we have copied myfirstfile.txt to HDFS. Now set its replication factor to 2.
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