Preparing to create an HBase replication policy

Before you create HBase replication policies, you must prepare the clusters, register cloud storage in Replication Manager, and verify cluster access.

Do the source cluster and target cluster meet the requirements to create an HBase replication policy?
For more information, see Support matrix for Replication Manager on CDP Public Cloud.
Is the source CDH cluster or source CDP Private Cloud Base cluster registered as a classic cluster on the Management Console?
CDH clusters and CDP Private Cloud Base clusters are managed by Cloudera Manager. To enable these on-premises clusters for Replication Manager, you must register them as classic clusters on the Management Console. After registration, you can use them for data migration purposes.
important
When you register a CDP Private Cloud Base cluster as a classic cluster, ensure that you use only the Cloudera Manager IP Address and Cloudera Manager Port options and not the Register KNOX endpoint (Optional) option.
For information about registering an on-premises cluster as a classic cluster, see Adding a CDH cluster and Adding a CDP Private Cloud Base cluster.
Are the following steps complete on the CDP Private Cloud Base source cluster or CDH source cluster (these steps are not required for COD sources)?
1. Have you installed the HBase replication plugin parcel in the CDH source clusters?
  Applicable for CDH versions 7.2.x that are lower than 7.2.2, versions 7.1.x that are lower than 7.1.5, and for versions lower than 7.x. For more information, see Cloudera Replication Plugin.
2. Have you created the /user/hbase folder for the hbase user in HDFS in the source cluster?
  Applicable for Cloudera Manager versions 7.4.3 or lower.
  tip
  To create the folder, run the following commands:
  sudo -u hdfs hdfs dfs -mkdir /user/hbase sudo -u hdfs hdfs dfs -chown hbase:hbase /user/hbase
  These commands allow the HBase replication policy to replicate the existing data in the source cluster.
Is the required cloud credential that you want to use in the replication policy registered with the Replication Manager service?
For more information, see Working with cloud credentials.
Have you assigned the managed identity of source roles, Storage Blob Data Owner or Storage Blob Data Contributor, to the destination storage data container and vice versa for bidirectional replication when you are using COD on Microsoft Azure?
The roles allow writing a snapshot in the destination cluster container.
Is the required target cluster (Data Hub or COD) available and healthy?
Do you have the required cluster access to create or view replication policies?
Does DNS resolution work as expected between the source and destination clusters?

tip
If the destination cluster is not reachable from the source RegionServer hosts, add the hostname and IP address of the destination hosts to the /etc/hosts file on the RegionServers of the source cluster.
Is the outgoing SSH port open on the Cloudera Manager host?
Do you need to replicate data securely? If so, ensure that the SSL/TLS certificate exchange between two Cloudera Manager instances that manage source and target clusters respectively is configured. For more information, see Configuring SSL/TLS certificate exchange between two Cloudera Manager instances.

Are the following ports open and available for Replication Manager?

Table 1. Minimum ports required for HBase replication policies
Ports	Service	Description
2181 and 16020	Destination hosts of the AWS cluster or ADLS cluster (target cluster), and the Cloudera Manager server port on the source cluster	Verify whether the ports 16020 for worker security group and 2181 for worker, master, and leader groups are open for connection from the source cluster to the destination cluster on AWS or Azure. This ensures that the source HBase service can communicate with Zookeeper and HBase services on the destination hosts uninterruptedly. For more information, see Ports for HBase replication.
16000	HMaster	Open the port on the Master Nodes (HBase Master Node and any back-up HBase Master node). Before you select the Validate Replication option during the first HBase replication policy creation between two specific clusters, you must ensure that the port is open on the target cluster.
7180 or 7183	Cloudera Manager Admin Console HTTP	Open on the source cluster to enable Data lake Cloudera Manager to communicate to the on-premises Cloudera Manager. Connects to destination SDX Data Lake Cloudera Manager.
9000	Cloudera Manager Agent	Open on the source and target cluster to retrieve diagnostic and log information.
6000-6049	Cluster Connectivity Manager (CCM)	Required for SSL connections to the Control Plane via CCM to communicate with Replication Manager.
80 or 443	Data transfer from secondary node for AWS / ADLS Gen2	Outgoing port. Open on all the HDFS nodes for AWS and ADLS Gen2.
8443	Data Lake cluster	Outgoing port. Configure the port on the Data Lake cluster as the outgoing port for CDP Management Console to communicate with Cloudera Manager and Knox.
8032	YARN Resource Manager	Open on the source and target cluster to access the YARN ResourceManager.

After the clusters and cloud storage requirements are met, you can create an HBase replication policy.