The list is ordered by the
AdaptiveRevisitHostQueue.getNextReadyTime AdaptiveRevisitHostQueue.getNextReadyTime() ,
smallest value at the top of the list and then on in descending order.
The list will maintain a list of hostnames in a seperate DB.
Behaves like
BdbFrontier (i.e., a basic mostly breadth-first
frontier), but with the addition that you can set the number of documents
to download on a per site basis.
A SerialBinding that recycles a single FastOutputStream per
thread, avoiding reallocation of the internal buffer for
either repeated serializations or because of mid-serialization
expansions.