Minor Description
The command updatedb (class o.a.n.crawl.CrawlDb) does not allow to update the CrawlDb with fetch status only (from segment subdirectory crawl_fetch) without also reading crawl_parse (which contains outlinks but also scores, signatures and meta data).
A workflow which does not require parsing of documents (e.g., because raw HTML content is exported to WARC files) is then unable to update the CrawlDb to store the fetch status.