private boolean doPutOnRegionEntryInMap() {
    synchronized (getRegionEntry()) {
      if (isRegionEntryRemoved()) {
        return false;
      }
      doPutOnSynchronizedRegionEntry();
      return true;
    }
  }
@return false if caller should retry because entry is no longer in the map
geode-core/src/main/java/org/apache/geode/internal/cache/map/AbstractRegionMapPut.java