[2/4] nutch git commit: CrawlDb statistics: add fetch interval (shortest, longest, average)

CrawlDb statistics: add fetch interval (shortest, longest, average) Project: http://git-wip-us.apache.org/repos/asf/nutch/repo Commit: http://git-wip-us.apache.org/repos/asf/nutch/commit/39f6c713 Tree: http://git-wip-us.apache.org/repos/asf/nutch/tree/39f6c713 Diff:

[3/4] nutch git commit: CrawlDb statistics: add fetch time (earliest, latest, average)

CrawlDb statistics: add fetch time (earliest, latest, average) Project: http://git-wip-us.apache.org/repos/asf/nutch/repo Commit: http://git-wip-us.apache.org/repos/asf/nutch/commit/ea2843b9 Tree: http://git-wip-us.apache.org/repos/asf/nutch/tree/ea2843b9 Diff: