private static boolean isRegionReplicaReplicationEnabled(Configuration conf) {
    return conf.getBoolean(REGION_REPLICA_REPLICATION_CONF_KEY, DEFAULT_REGION_REPLICA_REPLICATION);
  }
Returns True if Region Read Replica is enabled for user-space tables.
hbase-server/src/main/java/org/apache/hadoop/hbase/util/ServerRegionReplicaUtil.java