Configuring replication with Apache HBase in EMR

You can configure your Cloudera Operational Database (COD) experience for data replication with an Amazon EMR cluster with Apache HBase.

Ensure that you have the replication plugin. Contact your Cloudera account team to get the replication plugin.
Ensure that all the EC2 instances in the EMR cluster can communicate with COD. For example, you can configure this by placing the EMR cluster on the same VPC netwoek and subnets used by the COD instance.
Ensure that your COD cluster security group allows inbound TCP connections to ports 16020, 16010, and 2181 from all the EC2 instances in the EMR cluster. You can configure this using the AWS management console. The port configuration is automatically done if the EMR EC2 instances are configured with the same worker, leader, and controller (also known as master) security groups from COD.

Copy the replication plugin to /usr/lib/hbase/lib/ on all EMR cluster RegionServer. (requires root access);

important
This step requires you to have root access to the EMR cluster.

Add the keystore generated on the destination COD cluster to HDFS using the following command:

hdfs dfs -mkdir /hbase-replication

hdfs dfs -put /[***PATH***]/[***credentials.jceks***] /hbase-replication

hdfs dfs -chown -R hbase:hbase /hbase-replication

Edit the EMR /etc/hbase/conf.dist/hbase-site.xml file on each RegionServer host to add the following values:

<property>
	  <name>[***hbase.security.replication.credential.provider.path***]</name>
	  <value>cdprepjceks://hdfs@[***NAMENODE_HOST***]:[***NAMENODE_PORT***]/hbase-replication/credentials.jceks</value>
	</property>
	<property>
	  <name>[***hbase.security.replication.user.name***]</name>
	  <value>srv_[***WORKLOAD USER NAME***]</value>
	</property>

Restart the EMR RegionServer by stopping the running processes. RegionServers autostarts and now uses the additional JAR files in the classpath.
Use _ReplicationSetupTool_ to add the peer. _ReplicationSetupTool_ is a command line tool that enables you to create the replication peer and make necessary configuration to be peer specific.

sudo -u hbase hbase org.apache.hadoop.hbase.client.replication.ReplicationSetupTool 
-clusterKey "zk-host-1,zk-host-2,zk-host-3:2181:/hbase" 
-endpointImpl "org.apache.hadoop.hbase.replication.regionserver.CldrHBaseInterClusterReplicationEndpoint" -peerId 1