@Override
  protected void updateEntryExpiryPossible() {
    super.updateEntryExpiryPossible();
    if (!isEntryExpiryPossible()) {
      // since expiration is no longer possible cleanup the tasks
      cancelAllEntryExpiryTasks();
    }
  }
initializes a new version vector for this region
geode-core/src/main/java/org/apache/geode/internal/cache/LocalRegion.java