@Override
  public Region createSubregion(String subregionName, RegionAttributes attrs)
      throws RegionExistsException, TimeoutException {
    RegionCreation subregion = new RegionCreation(cache, this, subregionName, null);
    subregion.setAttributes(attrs);
    addSubregion(subregionName, subregion);
    return subregion;
  }
Adds a subregion with the given name to this region


@throws RegionExistsException If a subregion with <code>name</code> already exists
geode-core/src/main/java/org/apache/geode/internal/cache/xmlcache/RegionCreation.java