public synchronized Map<T, Long> getMemberToGCVersion() {
    HashMap<T, Long> results = new HashMap<>(memberToGCVersion);
    if (localGCVersion.get() > 0) {
      results.put(getOwnerId(), localGCVersion.get());
    }
    return results;
  }
Get a map of member to the GC version of that member, including the local member.
geode-core/src/main/java/org/apache/geode/internal/cache/versions/RegionVersionVector.java