private void putIfAbsentNewEntry() {
    if (isCreate()) {
      RegionEntry oldRe = getRegionMap().putEntryIfAbsent(getEvent().getKey(), getRegionEntry());
      if (oldRe != null) {
        setCreate(false);
        setRegionEntry(oldRe);
      }
    }
  }
@return false if caller should retry
geode-core/src/main/java/org/apache/geode/internal/cache/map/AbstractRegionMapPut.java