Configuring Apache HBase High Availability

Activate read replicas on a table

After enabling read replica support on your RegionServers, configure the tables for which you want read replicas to be created.

After enabling read replica support on your RegionServers, configure the tables for which you want read replicas to be created.

At table creation, to create a new table with read replication capabilities enabled, set the REGION_REPLICATION property on the table. Use a command like the following, in HBase Shell:
```
hbase> create 'myTable', 'myCF', {REGION_REPLICATION => '3'}
```
By altering an existing table, you can also alter an existing column family to enable or change the number of read replicas it propagates, using a command similar to the following. The change will take effect at the next major compaction.
```
hbase> disable 'myTable'
hbase> alter 'myTable', 'myCF', {REGION_REPLICATION => '3'}
hbase> enable 'myTable'
```