@Override
  public HRegionLocation getRegionLocation(byte[] row, int replicaId, boolean reload)
    throws IOException {
    return get(locator.getRegionLocation(row, replicaId, reload));
  }
The {@link RegionLocator} implementation based on {@link AsyncTableRegionLocator}.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/RegionLocatorOverAsyncTableRegionLocator.java