I don't get it. The version is bumped on `Put` and `Remove`. It would only be a problem if the sustained modification rate is > 1000/s. I don't understand why the gossipInterval would affect this.

The idea is that removed entries are first set to `None` and that is spread to all nodes, and thereafter the entries can be pruned (after a few minutes).

However, I see that I did a mistake to compare with currentTimeMillis. I should compare `bucket.version - version`.