@Override
  @SuppressWarnings({"rawtypes", "unchecked"})
  public Set<VersionSource> clear(RegionVersionVector rvv, BucketRegion bucketRegion) {
    // nothing needs to be done
    RegionVersionVector v = owner.getVersionVector();
    if (v != null) {
      return v.getDepartedMembersSet();
    } else {
      return Collections.emptySet();
    }
  }
the region that owns this map
geode-core/src/main/java/org/apache/geode/internal/cache/ProxyRegionMap.java