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Managed to reproduce
[0]
crawl issue locally using the following test repository:https://github.com/bcoe/external-link-repo
Designed specifcially to trigger the bug.
tldr; there was a slight bug with the retry logic, rather than retrying failed links, it was only caching one entry per host. This meant that when a burst of errors occurred, we would immediately hit the stop condition and not actually retry the failed URLs.
I have not been able to recreate the failure when running locally with this fix.