Because the number of tombstones will grow over time, it may be prudent to create a process to clean up this store after a period of time in order to save space.

因为tombstone日志中的信息将随时间增加，所以有必要创建一个进程定期清理该存储。清理tombstone数据能够节省空间并且有助于改善同步性能。

youdao

Again, this probably should be cleaned up and in a couple of weeks we'll spend a day or half period trying, to clean it up and make it somewhat more precise.

以上内容还有待梳理,未来两周我们将会花上一天半左右的时间,试着梳理这些内容,使其更加精确

耶鲁公开课 - 死亡课程节选