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