Keep replicas current
You can choose from two different mechanisms for keeping replicas up to date: using a timer or using replication.
Using a Timer: In this mode, replicas are refreshed at a time interval controlled by the configuration option hbase.regionserver.storefile.refresh.period.
Using Replication: In this mode, replicas are kept current between a source and sink
cluster using HBase replication. The sink clusrter in this cluster is just the read replcias in
the same HBase cluster. This can potentially allow for faster synchronization than using a timer.
Each time a flush occurs on the source cluster, a notification is pushed to the sink clusters for
the table. To use replication to keep replicas current, you must first set the column family
attribute REGION_MEMSTORE_REPLICATION to
false, then set the HBase configuration
property hbase.region.replica.replication.enabled to
true.