HDFS replication factor

Question

When I\'m uploading a file to HDFS, if I set the replication factor to 1 then the file splits gonna reside on one single machine or the splits would be distributed to multiple m

Answer 1

• If your cluster is single node then when you upload a file it will be spilled according to the blocksize and it remains in single machine.
• If your cluster is Multi node then when you upload a file it will be spilled according to the blocksize and it will be distributed to different datanode in your cluster via pipeline and NameNode will decide where the data should be moved in the cluster.

HDFS replication factor is used to make a copy of the data (i.e) if your replicator factor is 2 then all the data which you upload to HDFS will have a copy.