Minor Description
As discussed on the mailing list (see http://www.mail-archive.com/nutch-user@lucene.apache.org/msg15360.html) this patch allows to clear URLs queues in the Fetcher when more than a set number of exceptions have been encountered in a row. This can speed up the fetching substantially in cases where target hosts are not responsive (as a TimeoutException would be thrown) and limits cases where a whole Fetch step is slowed down because of a few queues.
by default the parameter fetcher.max.exceptions.per.queue has a value of -1 and is deactivated.
