Apache Hadoop High Availability
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Monitoring Secondary Region Replicas

HBase provides highly available tables by replicating table regions. All replicated regions have a unique replica ID. The replica ID for a primary region is always 0. The HBase web-based interface displays the replica IDs for all defined table regions. In the following example, the table t1 has two regions. The secondary region is identified by a replica ID of 1.

To access the HBase Master Server user interface, point your browser to port 16010.