private void saveUserBits(boolean notToUseUserBits, byte userBits) {
      this.notToUseUserBits = notToUseUserBits;
      if (notToUseUserBits) {
        this.userBits = 0;
      } else {
        this.userBits = EntryBits.getPersistentBits(userBits);
        size++; // for the userBits
      }
    }
How many bytes it will be when serialized
geode-core/src/main/java/org/apache/geode/internal/cache/Oplog.java