How to change the replication factor of data which is already stored in HDFS ?

[DataFlair Team]

If data is present in HDFS and Replication Factor is defined, then how can we change Replication Factor of data already stored in hdfs? The global RF is 4 but for few files, I want to increase the replication factor to 6, since I want to do this for limited files, not all the data in hdfs, no need to change the configuration parameter in hdfs-site.xml. Without moving the data can we increase it dynamically?

[DataFlair Team]

Default replication factor in HDFS is 3
In order to change this we can issue below command :
where /user/hadoop/sample.txt is path of file in HDFS

4 : new replication factor

$ hadoop dfs -setrep -R -w 4 /user/hadoop/sample.txt

[DataFlair Team]

The command to change the replication factor of existing file to 2
$./bin/hadoop dfs -setrep -w <2> <path of file>
The command to change the replication factor of entire HDFS to 2

$.hadoop dfs -setrep -R -w 2 /user/hadoop/sample.txt

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