@Override
  void basicInvalidatePart3(RegionEntry re, EntryEventImpl event, boolean invokeCallbacks) {
    distributeInvalidate(event);
    super.basicInvalidatePart3(re, event, invokeCallbacks);
  }
Return true if invalidation occurred; false if it did not, for example if it was already
invalidated
geode-core/src/main/java/org/apache/geode/internal/cache/DistributedRegion.java