public void setRegionVersion(long version) {
    regionVersionHighBytes = (short) ((version & 0xFFFF00000000L) >> 32);
    regionVersionLowBytes = (int) (version & 0xFFFFFFFFL);
  }
@return true if this is a gateway timestamp holder rather than a full version tag
geode-core/src/main/java/org/apache/geode/internal/cache/versions/VersionTag.java