@Override
  public Set<Region<?, ?>> rootRegions(boolean includePRAdminRegions) {
    Set<Region<?, ?>> result = delegate.rootRegions(includePRAdminRegions);
    checkSetOfRegions(result);
    return result;
  }
This method can be used to locate an internal region.
It should not be invoked with a region name obtained
from a client.
geode-core/src/main/java/org/apache/geode/internal/cache/InternalCacheForClientAccess.java