HDFS replication policy concepts

To create a HDFS replication policy from on-premises to the cloud account, you must register your cloud account credentials with Replication Manager service, so that Replication Manager can access your cloud storage. The replication policy runs on the cluster and pushes the data to the cloud storage. The cluster can be an on-premises or IaaS cluster with data on local HDFS. The cluster requires HDFS, YARN, Ranger, and Knox services to perform replication.

Before performing HDFS replication using classic clusters, see Working with Cloud Credentials.

You can enable HDFS snapshots for replication in Replication Manager. HDFS snapshots are read-only point-in-time copies of the filesystem. You can enable snapshots on the entire filesystem, or on a subtree of the filesystem. For Replication Manager, you enable snapshots at a dataset level. Understanding how snapshots work and some of the benefits and costs involved can help you to decide whether or not to enable snapshot. For more information about HDFS snapshots, see HDFS snapshots.