Migrating data to Cloudera Base on premises from CDH using Replication Manager

You can use Cloudera Base on premises Replication Manager to migrate HDFS and Hive data from CDH source clusters to Cloudera Base on premises target clusters. Before you replicate data using Replication Manager, you must consider a few guidelines.

Review the following points before you migrate the HDFS and Hive data from CDH clusters to Cloudera Base on premises clusters:

The supported source and target clusters and the corresponding Cloudera Manager versions must be in sync with respect to the cluster configurations.
You must first upgrade your target cluster to Cloudera Base on premises because this action ensures that your data on the source cluster is not corrupted or rendered invalid.
You can upgrade the source cluster to Cloudera Base on premises after the data is migrated to the Cloudera Base on premises (target).
In a typical production environment where multiple replication schedules are underway, the cluster upgrade process does not interrupt the data movement experience (migration). The only exception is when you are running the Hive replication policies or have any of them scheduled.
note
You cannot perform the cluster upgrade process while your Hive replication policies are running or scheduled to commence shortly. Make sure to either abort or wait for the submitted Hive replication policies to complete, before you commence the cluster upgrade process.
After the data is migrated, verify that both the source and target clusters are upgraded to Cloudera Base on premises.

For more information about upgrading CDH clusters, see Upgrading CDH to Cloudera Base on premises.

You must also consider the following supported and unsupported scenarios pertaining to Replication Manager after you upgrade your CDH clusters to Cloudera Base on premises clusters:

Cloudera Manager 6.3.1 as target cluster supports:

non-high availability (HA) NameNode configurations.
HDFS, Hive, and Sentry to Ranger replication.
replicates only from source cluster versions 7.0.3 or 7.1.3.

Cloudera Manager 6.3.1 as target or source cluster does not support:

high availability (HA) NameNode configurations.
Ranger to Ranger policy replication.
Ozone to Ozone replication.
Iceberg tables to Iceberg tables replication.