@Override
  public boolean containsKey(Object key) {
    checkReadiness();
    checkForNoAccess();
    return getDataView().containsKey(getKeyInfo(key), this);
  }
return a set of the keys in this region

@param allowTombstones whether destroyed entries should be included
@return the keys
geode-core/src/main/java/org/apache/geode/internal/cache/LocalRegion.java