void distributeUpdateEntryVersion(EntryEventImpl event) {
    if (!isRegionInvalid() && event.isDistributed() && !event.isOriginRemote()
        && !isTX() /* only distribute if non-tx */) {
      if (event.isDistributed() && !event.isOriginRemote()) {
        // before distribute: DR has sent callback earlier
        UpdateEntryVersionOperation op = new UpdateEntryVersionOperation(event);
        op.distribute();
      }
    }
  }
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