public static int adjustHash(int hash) {
    if (hash == DurableIntToMultiIntMap.NO_VALUE) {
      //DurableIntToMultiIntMap doesn't allow 0 keys/values => replace 0 key with just anything !=0.
      // Key (=hash) doesn't identify value uniquely anyway, hence this replacement just adds another
      // collision -- basically, we replaced original Key.hash with our own hash, which avoids 0 at
      // the cost of slightly higher collision chances
      return -1;// anything !=0 will do
    }
    return hash;
  }
public static int adjustHash(int hash)