HBase Master-Slave Configuration Guide

There are two ways to configure master-slave replication in HBase: one-way replication and two-way replication.

1. One-way replication: In one-way replication, one HBase cluster serves as the master cluster while another HBase cluster serves as the slave cluster. The master cluster is responsible for handling all write operations and replicating the write operation logs to the slave cluster. The slave cluster can be used for reading data but cannot perform write operations. This configuration is suitable for scenarios requiring data backup, providing read load balancing, and reducing the read/write pressure on the master cluster.
2. Bidirectional replication: In bidirectional replication, two HBase clusters have a master-slave relationship with each other, allowing for both read and write operations. Data written in one cluster is simultaneously replicated to the other cluster, providing redundant backups and load balancing. Bidirectional replication is particularly useful for applications that require high availability and data consistency.

Both one-way replication and two-way replication in HBase require the following steps for configuring the master-slave setup.

1. Enable HBase master-slave replication by setting the property hbase.replication=true for HBase configuration.
2. Configure the hbase-site.xml file separately on the primary cluster and secondary cluster in HBase, specifying relevant parameters for the primary and secondary clusters such as hbase.zookeeper.quorum and hbase.zookeeper.property.clientPort.
3. Create a table on the primary cluster and activate replication for it.
4. Create a table on the cluster with the same structure as the main cluster and set it as a replicated table.
5. Data will automatically be replicated to the secondary cluster when performing write operations on the primary cluster using HBase shell or API.
6. Read replicated data from a cluster using HBase shell or API.

It’s important to note that master-slave replication relies on ZooKeeper for metadata management and coordination, so before configuring master-slave replication, make sure the ZooKeeper cluster is running correctly.